Add markdown CI (#5380)

2019-12-04 16:22:57 +01:00 · 2019-12-04 16:22:57 +01:00 · a9b67d586b
commit a9b67d586b
parent b1fbead531
41 changed files with 567 additions and 507 deletions
--- a/.gitlab-ci/lint.yml
+++ b/.gitlab-ci/lint.yml
@ -47,3 +47,11 @@ tox-inventory-builder:
    - cd contrib/inventory_builder && tox
  when: manual
  except: ['triggers', 'master']
+
+markdownlint:
+  stage: unit-tests
+  image: node
+  before_script:
+    - npm install -g markdownlint-cli
+  script:
+    - markdownlint README.md docs --ignore docs/_sidebar.md
--- a/.markdownlint.yaml
+++ b/.markdownlint.yaml
@ -0,0 +1,2 @@
+---
+MD013: false
--- a/README.md
+++ b/README.md
@ -1,7 +1,6 @@
-![Kubernetes Logo](https://raw.githubusercontent.com/kubernetes-sigs/kubespray/master/docs/img/kubernetes-logo.png)
+# Deploy a Production Ready Kubernetes Cluster

-Deploy a Production Ready Kubernetes Cluster
-============================================
+![Kubernetes Logo](https://raw.githubusercontent.com/kubernetes-sigs/kubespray/master/docs/img/kubernetes-logo.png)

 If you have questions, check the [documentation](https://kubespray.io) and join us on the [kubernetes slack](https://kubernetes.slack.com), channel **\#kubespray**.
 You can get your invite [here](http://slack.k8s.io/)
@ -12,8 +11,7 @@ You can get your invite [here](http://slack.k8s.io/)
 - Supports most popular **Linux distributions**
 - **Continuous integration tests**

-Quick Start
-----------
+## Quick Start

 To deploy the cluster you can use :

@ -21,31 +19,35 @@ To deploy the cluster you can use :

 #### Usage

-    # Install dependencies from ``requirements.txt``
-    sudo pip install -r requirements.txt
+```ShellSession
+# Install dependencies from ``requirements.txt``
+sudo pip install -r requirements.txt

-    # Copy ``inventory/sample`` as ``inventory/mycluster``
-    cp -rfp inventory/sample inventory/mycluster
+# Copy ``inventory/sample`` as ``inventory/mycluster``
+cp -rfp inventory/sample inventory/mycluster

-    # Update Ansible inventory file with inventory builder
-    declare -a IPS=(10.10.1.3 10.10.1.4 10.10.1.5)
-    CONFIG_FILE=inventory/mycluster/inventory.ini python3 contrib/inventory_builder/inventory.py ${IPS[@]}
+# Update Ansible inventory file with inventory builder
+declare -a IPS=(10.10.1.3 10.10.1.4 10.10.1.5)
+CONFIG_FILE=inventory/mycluster/inventory.ini python3 contrib/inventory_builder/inventory.py ${IPS[@]}

-    # Review and change parameters under ``inventory/mycluster/group_vars``
-    cat inventory/mycluster/group_vars/all/all.yml
-    cat inventory/mycluster/group_vars/k8s-cluster/k8s-cluster.yml
+# Review and change parameters under ``inventory/mycluster/group_vars``
+cat inventory/mycluster/group_vars/all/all.yml
+cat inventory/mycluster/group_vars/k8s-cluster/k8s-cluster.yml

-    # Deploy Kubespray with Ansible Playbook - run the playbook as root
-    # The option `--become` is required, as for example writing SSL keys in /etc/,
-    # installing packages and interacting with various systemd daemons.
-    # Without --become the playbook will fail to run!
-    ansible-playbook -i inventory/mycluster/inventory.ini --become --become-user=root cluster.yml
+# Deploy Kubespray with Ansible Playbook - run the playbook as root
+# The option `--become` is required, as for example writing SSL keys in /etc/,
+# installing packages and interacting with various systemd daemons.
+# Without --become the playbook will fail to run!
+ansible-playbook -i inventory/mycluster/inventory.ini --become --become-user=root cluster.yml
+```

 Note: When Ansible is already installed via system packages on the control machine, other python packages installed via `sudo pip install -r requirements.txt` will go to a different directory tree (e.g. `/usr/local/lib/python2.7/dist-packages` on Ubuntu) from Ansible's (e.g. `/usr/lib/python2.7/dist-packages/ansible` still on Ubuntu).
 As a consequence, `ansible-playbook` command will fail with:
-```
+
+```raw
 ERROR! no action detected in task. This often indicates a misspelled module name, or incorrect module path.
 ```
+
 probably pointing on a task depending on a module present in requirements.txt (i.e. "unseal vault").

 One way of solving this would be to uninstall the Ansible package and then, to install it via pip but it is not always possible.
@ -56,16 +58,19 @@ A workaround consists of setting `ANSIBLE_LIBRARY` and `ANSIBLE_MODULE_UTILS` en
 For Vagrant we need to install python dependencies for provisioning tasks.
 Check if Python and pip are installed:

-    python -V && pip -V
+```ShellSession
+python -V && pip -V
+```

 If this returns the version of the software, you're good to go. If not, download and install Python from here <https://www.python.org/downloads/source/>
 Install the necessary requirements

-    sudo pip install -r requirements.txt
-    vagrant up
+```ShellSession
+sudo pip install -r requirements.txt
+vagrant up
+```

-Documents
---------
+## Documents

 - [Requirements](#requirements)
 - [Kubespray vs ...](docs/comparisons.md)
@ -91,8 +96,7 @@ Documents
 - [Upgrades basics](docs/upgrades.md)
 - [Roadmap](docs/roadmap.md)

-Supported Linux Distributions
-----------------------------
+## Supported Linux Distributions

 - **Container Linux by CoreOS**
 - **Debian** Buster, Jessie, Stretch, Wheezy
@ -105,8 +109,7 @@ Supported Linux Distributions

 Note: Upstart/SysV init based OS types are not supported.

-Supported Components
--------------------
+## Supported Components

 - Core
  - [kubernetes](https://github.com/kubernetes/kubernetes) v1.16.3
@ -132,8 +135,8 @@ Supported Components

 Note: The list of validated [docker versions](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.16.md) was updated to 1.13.1, 17.03, 17.06, 17.09, 18.06, 18.09. kubeadm now properly recognizes Docker 18.09.0 and newer, but still treats 18.06 as the default supported version. The kubelet might break on docker's non-standard version numbering (it no longer uses semantic versioning). To ensure auto-updates don't break your cluster look into e.g. yum versionlock plugin or apt pin).

-Requirements
------------
+## Requirements
+
 - **Minimum required version of Kubernetes is v1.15**
 - **Ansible v2.7.8 (or newer, but [not 2.8.x](https://github.com/kubernetes-sigs/kubespray/issues/4778)) and python-netaddr is installed on the machine
    that will run Ansible commands**
@ -155,8 +158,7 @@ These limits are safe guarded by Kubespray. Actual requirements for your workloa
 - Node
  - Memory: 1024 MB

-Network Plugins
---------------
+## Network Plugins

 You can choose between 10 network plugins. (default: `calico`, except Vagrant uses `flannel`)

@ -189,22 +191,19 @@ The choice is defined with the variable `kube_network_plugin`. There is also an
 option to leverage built-in cloud provider networking instead.
 See also [Network checker](docs/netcheck.md).

-Community docs and resources
----------------------------
+## Community docs and resources

 - [kubernetes.io/docs/setup/production-environment/tools/kubespray/](https://kubernetes.io/docs/setup/production-environment/tools/kubespray/)
 - [kubespray, monitoring and logging](https://github.com/gregbkr/kubernetes-kargo-logging-monitoring) by @gregbkr
 - [Deploy Kubernetes w/ Ansible & Terraform](https://rsmitty.github.io/Terraform-Ansible-Kubernetes/) by @rsmitty
 - [Deploy a Kubernetes Cluster with Kubespray (video)](https://www.youtube.com/watch?v=N9q51JgbWu8)

-Tools and projects on top of Kubespray
--------------------------------------
+## Tools and projects on top of Kubespray

 - [Digital Rebar Provision](https://github.com/digitalrebar/provision/blob/v4/doc/integrations/ansible.rst)
 - [Terraform Contrib](https://github.com/kubernetes-sigs/kubespray/tree/master/contrib/terraform)

-CI Tests
--------
+## CI Tests

 [![Build graphs](https://gitlab.com/kargo-ci/kubernetes-sigs-kubespray/badges/master/build.svg)](https://gitlab.com/kargo-ci/kubernetes-sigs-kubespray/pipelines)

--- a/docs/ansible.md
+++ b/docs/ansible.md
@ -1,9 +1,7 @@
-Ansible variables
-===============
+# Ansible variables

+## Inventory

-Inventory
-------------
 The inventory is composed of 3 groups:

 * **kube-node** : list of kubernetes nodes where the pods will run.
@ -14,7 +12,7 @@ Note: do not modify the children of _k8s-cluster_, like putting
 the _etcd_ group into the _k8s-cluster_, unless you are certain
 to do that and you have it fully contained in the latter:

-```
+```ShellSession
 k8s-cluster ⊂ etcd => kube-node ∩ etcd = etcd
 ```

@ -32,7 +30,7 @@ There are also two special groups:

 Below is a complete inventory example:

-```
+```ini
 ## Configure 'ip' variable to bind kubernetes services on a
 ## different ip than the default iface
 node1 ansible_host=95.54.0.12 ip=10.3.0.1
@ -63,8 +61,7 @@ kube-node
 kube-master
 ```

-Group vars and overriding variables precedence
----------------------------------------------
+## Group vars and overriding variables precedence

 The group variables to control main deployment options are located in the directory ``inventory/sample/group_vars``.
 Optional variables are located in the `inventory/sample/group_vars/all.yml`.
@ -73,7 +70,7 @@ Mandatory variables that are common for at least one role (or a node group) can
 There are also role vars for docker, kubernetes preinstall and master roles.
 According to the [ansible docs](http://docs.ansible.com/ansible/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable),
 those cannot be overridden from the group vars. In order to override, one should use
-the `-e ` runtime flags (most simple way) or other layers described in the docs.
+the `-e` runtime flags (most simple way) or other layers described in the docs.

 Kubespray uses only a few layers to override things (or expect them to
 be overridden for roles):
@ -97,8 +94,8 @@ block vars (only for tasks in block) | Kubespray overrides for internal roles' l
 task vars (only for the task) | Unused for roles, but only for helper scripts
 **extra vars** (always win precedence) | override with ``ansible-playbook -e @foo.yml``

-Ansible tags
------------
+## Ansible tags
+
 The following tags are defined in playbooks:

 |                 Tag name | Used for
@ -145,21 +142,25 @@ Note: Use the ``bash scripts/gen_tags.sh`` command to generate a list of all
 tags found in the codebase. New tags will be listed with the empty "Used for"
 field.

-Example commands
----------------
+## Example commands
+
 Example command to filter and apply only DNS configuration tasks and skip
 everything else related to host OS configuration and downloading images of containers:

-```
+```ShellSession
 ansible-playbook -i inventory/sample/hosts.ini cluster.yml --tags preinstall,facts --skip-tags=download,bootstrap-os
 ```
+
 And this play only removes the K8s cluster DNS resolver IP from hosts' /etc/resolv.conf files:
-```
+
+```ShellSession
 ansible-playbook -i inventory/sample/hosts.ini -e dns_mode='none' cluster.yml --tags resolvconf
 ```
+
 And this prepares all container images locally (at the ansible runner node) without installing
 or upgrading related stuff or trying to upload container to K8s cluster nodes:
-```
+
+```ShellSession
 ansible-playbook -i inventory/sample/hosts.ini cluster.yml \
    -e download_run_once=true -e download_localhost=true \
    --tags download --skip-tags upload,upgrade
@ -167,14 +168,14 @@ ansible-playbook -i inventory/sample/hosts.ini cluster.yml \

 Note: use `--tags` and `--skip-tags` wise and only if you're 100% sure what you're doing.

-Bastion host
--------------
+## Bastion host
+
 If you prefer to not make your nodes publicly accessible (nodes with private IPs only),
 you can use a so called *bastion* host to connect to your nodes. To specify and use a bastion,
 simply add a line to your inventory, where you have to replace x.x.x.x with the public IP of the
 bastion host.

-```
+```ShellSession
 [bastion]
 bastion ansible_host=x.x.x.x
 ```
--- a/docs/arch.md
+++ b/docs/arch.md
@ -1,6 +1,7 @@
-## Architecture compatibility
+# Architecture compatibility

 The following table shows the impact of the CPU architecture on compatible features:
+
 - amd64: Cluster using only x86/amd64 CPUs
 - arm64: Cluster using only arm64 CPUs
 - amd64 + arm64: Cluster with a mix of x86/amd64 and arm64 CPUs
--- a/docs/atomic.md
+++ b/docs/atomic.md
@ -1,23 +1,22 @@
-Atomic host bootstrap
-=====================
+# Atomic host bootstrap

 Atomic host testing has been done with the network plugin flannel. Change the inventory var `kube_network_plugin: flannel`.

 Note: Flannel is the only plugin that has currently been tested with atomic

-### Vagrant
+## Vagrant

 * For bootstrapping with Vagrant, use box centos/atomic-host or fedora/atomic-host
 * Update VagrantFile variable `local_release_dir` to `/var/vagrant/temp`.
 * Update `vm_memory = 2048` and `vm_cpus = 2`
 * Networking on vagrant hosts has to be brought up manually once they are booted.

-    ```
+    ```ShellSession
    vagrant ssh
    sudo /sbin/ifup enp0s8
    ```

-* For users of vagrant-libvirt download centos/atomic-host qcow2 format from https://wiki.centos.org/SpecialInterestGroup/Atomic/Download/
-* For users of vagrant-libvirt download fedora/atomic-host qcow2 format from https://dl.fedoraproject.org/pub/alt/atomic/stable/
+* For users of vagrant-libvirt download centos/atomic-host qcow2 format from <https://wiki.centos.org/SpecialInterestGroup/Atomic/Download/>
+* For users of vagrant-libvirt download fedora/atomic-host qcow2 format from <https://dl.fedoraproject.org/pub/alt/atomic/stable/>

 Then you can proceed to [cluster deployment](#run-deployment)
--- a/docs/aws.md
+++ b/docs/aws.md
@ -1,5 +1,4 @@
-AWS
-===============
+# AWS

 To deploy kubespray on [AWS](https://aws.amazon.com/) uncomment the `cloud_provider` option in `group_vars/all.yml` and set it to `'aws'`. Refer to the [Kubespray Configuration](#kubespray-configuration) for customizing the provider.

@ -13,11 +12,13 @@ The next step is to make sure the hostnames in your `inventory` file are identic

 You can now create your cluster!

-### Dynamic Inventory ###
+## Dynamic Inventory
+
 There is also a dynamic inventory script for AWS that can be used if desired. However, be aware that it makes some certain assumptions about how you'll create your inventory. It also does not handle all use cases and groups that we may use as part of more advanced deployments. Additions welcome.

 This will produce an inventory that is passed into Ansible that looks like the following:
-```
+
+```json
 {
  "_meta": {
    "hostvars": {
@ -48,15 +49,18 @@ This will produce an inventory that is passed into Ansible that looks like the f
 ```

 Guide:
+
 - Create instances in AWS as needed.
 - Either during or after creation, add tags to the instances with a key of `kubespray-role` and a value of `kube-master`, `etcd`, or `kube-node`. You can also share roles like `kube-master, etcd`
 - Copy the `kubespray-aws-inventory.py` script from `kubespray/contrib/aws_inventory` to the `kubespray/inventory` directory.
 - Set the following AWS credentials and info as environment variables in your terminal:
-```
+
+```ShellSession
 export AWS_ACCESS_KEY_ID="xxxxx"
 export AWS_SECRET_ACCESS_KEY="yyyyy"
 export REGION="us-east-2"
 ```
+
 - We will now create our cluster. There will be either one or two small changes. The first is that we will specify `-i inventory/kubespray-aws-inventory.py` as our inventory script. The other is conditional. If your AWS instances are public facing, you can set the `VPC_VISIBILITY` variable to `public` and that will result in public IP and DNS names being passed into the inventory. This causes your cluster.yml command to look like `VPC_VISIBILITY="public" ansible-playbook ... cluster.yml`

 ## Kubespray configuration
@ -75,4 +79,3 @@ aws_kubernetes_cluster_id|string|KubernetesClusterID is the cluster id we'll use
 aws_disable_security_group_ingress|bool|The aws provider creates an inbound rule per load balancer on the node security group. However, this can run into the AWS security group rule limit of 50 if many LoadBalancers are created. This flag disables the automatic ingress creation. It requires that the user has setup a rule that allows inbound traffic on kubelet ports from the local VPC subnet (so load balancers can access it). E.g. 10.82.0.0/16 30000-32000.
 aws_elb_security_group|string|Only in Kubelet version >= 1.7 : AWS has a hard limit of 500 security groups. For large clusters creating a security group for each ELB can cause the max number of security groups to be reached. If this is set instead of creating a new Security group for each ELB this security group will be used instead.
 aws_disable_strict_zone_check|bool|During the instantiation of an new AWS cloud provider, the detected region is validated against a known set of regions. In a non-standard, AWS like environment (e.g. Eucalyptus), this check may be undesirable.  Setting this to true will disable the check and provide a warning that the check was skipped.  Please note that this is an experimental feature and work-in-progress for the moment.
-
--- a/docs/azure.md
+++ b/docs/azure.md
@ -1,5 +1,4 @@
-Azure
-===============
+# Azure

 To deploy Kubernetes on [Azure](https://azure.microsoft.com) uncomment the `cloud_provider` option in `group_vars/all.yml` and set it to `'azure'`.

@ -7,38 +6,43 @@ All your instances are required to run in a resource group and a routing table h

 Not all features are supported yet though, for a list of the current status have a look [here](https://github.com/colemickens/azure-kubernetes-status)

-### Parameters
+## Parameters

 Before creating the instances you must first set the `azure_` variables in the `group_vars/all.yml` file.

-All of the values can be retrieved using the azure cli tool which can be downloaded here: https://docs.microsoft.com/en-gb/azure/xplat-cli-install
+All of the values can be retrieved using the azure cli tool which can be downloaded here: <https://docs.microsoft.com/en-gb/azure/xplat-cli-install>
 After installation you have to run `azure login` to get access to your account.

+### azure\_tenant\_id + azure\_subscription\_id

-#### azure\_tenant\_id + azure\_subscription\_id
 run `azure account show` to retrieve your subscription id and tenant id:
 `azure_tenant_id` -> Tenant ID field
 `azure_subscription_id` -> ID field

+### azure\_location

-#### azure\_location
 The region your instances are located, can be something like `westeurope` or `westcentralus`. A full list of region names can be retrieved via `azure location list`

+### azure\_resource\_group

-#### azure\_resource\_group
 The name of the resource group your instances are in, can be retrieved via `azure group list`

-#### azure\_vnet\_name
+### azure\_vnet\_name
+
 The name of the virtual network your instances are in, can be retrieved via `azure network vnet list`

-#### azure\_subnet\_name
+### azure\_subnet\_name
+
 The name of the subnet your instances are in, can be retrieved via `azure network vnet subnet list --resource-group RESOURCE_GROUP --vnet-name VNET_NAME`

-#### azure\_security\_group\_name
+### azure\_security\_group\_name
+
 The name of the network security group your instances are in, can be retrieved via `azure network nsg list`

-#### azure\_aad\_client\_id + azure\_aad\_client\_secret
+### azure\_aad\_client\_id + azure\_aad\_client\_secret
+
 These will have to be generated first:
+
 - Create an Azure AD Application with:
 `azure ad app create --display-name kubernetes --identifier-uris http://kubernetes --homepage http://example.com --password CLIENT_SECRET`
 display name, identifier-uri, homepage and the password can be chosen
@ -51,24 +55,28 @@ This is the AppId from the last command

 azure\_aad\_client\_id must be set to the AppId, azure\_aad\_client\_secret is your chosen secret.

-#### azure\_loadbalancer\_sku
+### azure\_loadbalancer\_sku
+
 Sku of Load Balancer and Public IP. Candidate values are: basic and standard.

-#### azure\_exclude\_master\_from\_standard\_lb
+### azure\_exclude\_master\_from\_standard\_lb
+
 azure\_exclude\_master\_from\_standard\_lb excludes master nodes from `standard` load balancer.

-#### azure\_disable\_outbound\_snat
+### azure\_disable\_outbound\_snat
+
 azure\_disable\_outbound\_snat disables the outbound SNAT for public load balancer rules. It should only be set when azure\_exclude\_master\_from\_standard\_lb is `standard`.

-#### azure\_primary\_availability\_set\_name
+### azure\_primary\_availability\_set\_name
+
 (Optional) The name of the availability set that should be used as the load balancer backend .If this is set, the Azure
 cloudprovider will only add nodes from that availability set to the load balancer backend pool. If this is not set, and
 multiple agent pools (availability sets) are used, then the cloudprovider will try to add all nodes to a single backend
 pool which is forbidden. In other words, if you use multiple agent pools (availability sets), you MUST set this field.

-#### azure\_use\_instance\_metadata
-Use instance metadata service where possible
+### azure\_use\_instance\_metadata

+Use instance metadata service where possible

 ## Provisioning Azure with Resource Group Templates

--- a/docs/calico.md
+++ b/docs/calico.md
@ -1,82 +1,83 @@
-Calico
-===========
+# Calico

---
- **N.B. Version 2.6.5 upgrade to 3.1.1 is upgrading etcd store to etcdv3**
- If you create automated backups of etcdv2 please switch for creating etcdv3 backups, as kubernetes and calico now uses etcdv3
+N.B. **Version 2.6.5 upgrade to 3.1.1 is upgrading etcd store to etcdv3**
+
+If you create automated backups of etcdv2 please switch for creating etcdv3 backups, as kubernetes and calico now uses etcdv3
 After migration you can check `/tmp/calico_upgrade/` directory for converted items to etcdv3.
 **PLEASE TEST upgrade before upgrading production cluster.**
- ---

 Check if the calico-node container is running

-```
+```ShellSession
 docker ps | grep calico
 ```

 The **calicoctl** command allows to check the status of the network workloads.
+
 * Check the status of Calico nodes

-```
+```ShellSession
 calicoctl node status
 ```

 or for versions prior to *v1.0.0*:

-```
+```ShellSession
 calicoctl status
 ```

 * Show the configured network subnet for containers

-```
+```ShellSession
 calicoctl get ippool -o wide
 ```

 or for versions prior to *v1.0.0*:

-```
+```ShellSession
 calicoctl pool show
 ```

 * Show the workloads (ip addresses of containers and their located)

-```
+```ShellSession
 calicoctl get workloadEndpoint -o wide
 ```

 and

-```
+```ShellSession
 calicoctl get hostEndpoint -o wide
 ```

 or for versions prior *v1.0.0*:

-```
+```ShellSession
 calicoctl endpoint show --detail
 ```

-##### Optional : Define network backend
+## Configuration
+
+### Optional : Define network backend

 In some cases you may want to define Calico network backend. Allowed values are 'bird', 'gobgp' or 'none'. Bird is a default value.

 To re-define you need to edit the inventory and add a group variable `calico_network_backend`

-```
+```yml
 calico_network_backend: none
 ```

-##### Optional : Define the default pool CIDR
+### Optional : Define the default pool CIDR

 By default, `kube_pods_subnet` is used as the IP range CIDR for the default IP Pool.
 In some cases you may want to add several pools and not have them considered by Kubernetes as external (which means that they must be within or equal to the range defined in `kube_pods_subnet`), it starts with the default IP Pool of which IP range CIDR can by defined in group_vars (k8s-cluster/k8s-net-calico.yml):

-```
+```ShellSession
 calico_pool_cidr: 10.233.64.0/20
 ```

-##### Optional : BGP Peering with border routers
+### Optional : BGP Peering with border routers

 In some cases you may want to route the pods subnet and so NAT is not needed on the nodes.
 For instance if you have a cluster spread on different locations and you want your pods to talk each other no matter where they are located.
@ -84,11 +85,11 @@ The following variables need to be set:
 `peer_with_router` to enable the peering with the datacenter's border router (default value: false).
 you'll need to edit the inventory and add a hostvar `local_as` by node.

-```
+```ShellSession
 node1 ansible_ssh_host=95.54.0.12 local_as=xxxxxx
 ```

-##### Optional : Defining BGP peers
+### Optional : Defining BGP peers

 Peers can be defined using the `peers` variable (see docs/calico_peer_example examples).
 In order to define global peers, the `peers` variable can be defined in group_vars with the "scope" attribute of each global peer set to "global".
@ -97,16 +98,17 @@ NB: Ansible's `hash_behaviour` is by default set to "replace", thus defining bot

 Since calico 3.4, Calico supports advertising Kubernetes service cluster IPs over BGP, just as it advertises pod IPs.
 This can be enabled by setting the following variable as follow in group_vars (k8s-cluster/k8s-net-calico.yml)
-```
+
+```yml
 calico_advertise_cluster_ips: true
 ```

-##### Optional : Define global AS number
+### Optional : Define global AS number

 Optional parameter `global_as_num` defines Calico global AS number (`/calico/bgp/v1/global/as_num` etcd key).
 It defaults to "64512".

-##### Optional : BGP Peering with route reflectors
+### Optional : BGP Peering with route reflectors

 At large scale you may want to disable full node-to-node mesh in order to
 optimize your BGP topology and improve `calico-node` containers' start times.
@ -114,8 +116,8 @@ optimize your BGP topology and improve `calico-node` containers' start times.
 To do so you can deploy BGP route reflectors and peer `calico-node` with them as
 recommended here:

-* https://hub.docker.com/r/calico/routereflector/
-* https://docs.projectcalico.org/v3.1/reference/private-cloud/l3-interconnect-fabric
+* <https://hub.docker.com/r/calico/routereflector/>
+* <https://docs.projectcalico.org/v3.1/reference/private-cloud/l3-interconnect-fabric>

 You need to edit your inventory and add:

@ -127,7 +129,7 @@ You need to edit your inventory and add:

 Here's an example of Kubespray inventory with standalone route reflectors:

-```
+```ini
 [all]
 rr0 ansible_ssh_host=10.210.1.10 ip=10.210.1.10
 rr1 ansible_ssh_host=10.210.1.11 ip=10.210.1.11
@ -177,35 +179,35 @@ The inventory above will deploy the following topology assuming that calico's

 ![Image](figures/kubespray-calico-rr.png?raw=true)

-##### Optional : Define default endpoint to host action
-
-By default Calico blocks traffic from endpoints to the host itself by using an iptables DROP action. When using it in kubernetes the action has to be changed to RETURN (default in kubespray) or ACCEPT (see https://github.com/projectcalico/felix/issues/660 and https://github.com/projectcalico/calicoctl/issues/1389). Otherwise all network packets from pods (with hostNetwork=False) to services endpoints (with hostNetwork=True) within the same node are dropped.
+### Optional : Define default endpoint to host action

+By default Calico blocks traffic from endpoints to the host itself by using an iptables DROP action. When using it in kubernetes the action has to be changed to RETURN (default in kubespray) or ACCEPT (see <https://github.com/projectcalico/felix/issues/660> and <https://github.com/projectcalico/calicoctl/issues/1389).> Otherwise all network packets from pods (with hostNetwork=False) to services endpoints (with hostNetwork=True) within the same node are dropped.

 To re-define default action please set the following variable in your inventory:
-```
+
+```yml
 calico_endpoint_to_host_action: "ACCEPT"
 ```

-##### Optional : Define address on which Felix will respond to health requests
+## Optional : Define address on which Felix will respond to health requests

 Since Calico 3.2.0, HealthCheck default behavior changed from listening on all interfaces to just listening on localhost.

 To re-define health host please set the following variable in your inventory:
-```
+
+```yml
 calico_healthhost: "0.0.0.0"
 ```

-Cloud providers configuration
-=============================
+## Cloud providers configuration

 Please refer to the official documentation, for example [GCE configuration](http://docs.projectcalico.org/v1.5/getting-started/docker/installation/gce) requires a security rule for calico ip-ip tunnels. Note, calico is always configured with ``ipip: true`` if the cloud provider was defined.

-##### Optional : Ignore kernel's RPF check setting
+### Optional : Ignore kernel's RPF check setting

 By default the felix agent(calico-node) will abort if the Kernel RPF setting is not 'strict'. If you want Calico to ignore the Kernel setting:

-```
+```yml
 calico_node_ignorelooserpf: true
 ```

@ -213,7 +215,7 @@ Note that in OpenStack you must allow `ipip` traffic in your security groups,
 otherwise you will experience timeouts.
 To do this you must add a rule which allows it, for example:

-```
+```ShellSession
 neutron  security-group-rule-create  --protocol 4  --direction egress  k8s-a0tp4t
 neutron  security-group-rule-create  --protocol 4  --direction igress  k8s-a0tp4t
 ```
--- a/docs/cinder-csi.md
+++ b/docs/cinder-csi.md
@ -1,5 +1,4 @@
-Cinder CSI Driver
-===============
+# Cinder CSI Driver

 Cinder CSI driver allows you to provision volumes over an OpenStack deployment. The Kubernetes historic in-tree cloud provider is deprecated and will be removed in future versions.

@ -15,11 +14,11 @@ If you want to deploy the cinder provisioner used with Cinder CSI Driver, you sh

 You can now run the kubespray playbook (cluster.yml) to deploy Kubernetes over OpenStack with Cinder CSI Driver enabled.

-## Usage example ##
+## Usage example

 To check if Cinder CSI Driver works properly, see first that the cinder-csi pods are running:

-```
+```ShellSession
 $ kubectl -n kube-system get pods | grep cinder
 csi-cinder-controllerplugin-7f8bf99785-cpb5v   5/5     Running   0          100m
 csi-cinder-nodeplugin-rm5x2                    2/2     Running   0          100m
@ -27,7 +26,7 @@ csi-cinder-nodeplugin-rm5x2                    2/2     Running   0          100m

 Check the associated storage class (if you enabled persistent_volumes):

-```
+```ShellSession
 $ kubectl get storageclass
 NAME         PROVISIONER                AGE
 cinder-csi   cinder.csi.openstack.org   100m
@ -35,7 +34,7 @@ cinder-csi   cinder.csi.openstack.org   100m

 You can run a PVC and an Nginx Pod using this file `nginx.yaml`:

-```
+```yml
 ---
 apiVersion: v1
 kind: PersistentVolumeClaim
@ -75,7 +74,8 @@ spec:
 Apply this conf to your cluster: ```kubectl apply -f nginx.yml```

 You should see the PVC provisioned and bound:
-```
+
+```ShellSession
 $ kubectl get pvc
 NAME                   STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
 csi-pvc-cinderplugin   Bound    pvc-f21ad0a1-5b7b-405e-a462-48da5cb76beb   1Gi        RWO            cinder-csi     8s
@ -83,17 +83,20 @@ csi-pvc-cinderplugin   Bound    pvc-f21ad0a1-5b7b-405e-a462-48da5cb76beb   1Gi

 And the volume mounted to the Nginx Pod (wait until the Pod is Running):

-```
+```ShellSession
 kubectl exec -it nginx -- df -h | grep /var/lib/www/html
 /dev/vdb        976M  2.6M  958M   1% /var/lib/www/html
 ```

-## Compatibility with in-tree cloud provider ##
+## Compatibility with in-tree cloud provider
+
 It is not necessary to enable OpenStack as a cloud provider for Cinder CSI Driver to work.
 Though, you can run both the in-tree openstack cloud provider and the Cinder CSI Driver at the same time. The storage class provisioners associated to each one of them are differently named.

-## Cinder v2 support ##
+## Cinder v2 support
+
 For the moment, only Cinder v3 is supported by the CSI Driver.

-## More info ##
+## More info
+
 For further information about the Cinder CSI Driver, you can refer to this page: [Cloud Provider OpenStack](https://github.com/kubernetes/cloud-provider-openstack/blob/master/docs/using-cinder-csi-plugin.md).
--- a/docs/cloud.md
+++ b/docs/cloud.md
@ -1,13 +1,13 @@
-Cloud providers
-==============
+# Cloud providers

-#### Provisioning
+## Provisioning

 You can deploy instances in your cloud environment in several different ways. Examples include Terraform, Ansible (ec2 and gce modules), and manual creation.

-#### Deploy kubernetes
+## Deploy kubernetes

 With ansible-playbook command
-```
+
+```ShellSession
 ansible-playbook -u smana -e ansible_ssh_user=admin -e cloud_provider=[aws|gce] -b --become-user=root -i inventory/single.cfg cluster.yml
 ```
--- a/docs/comparisons.md
+++ b/docs/comparisons.md
@ -1,5 +1,6 @@
-Kubespray vs [Kops](https://github.com/kubernetes/kops)
---------------
+# Comparaison
+
+## Kubespray vs [Kops](https://github.com/kubernetes/kops)

 Kubespray runs on bare metal and most clouds, using Ansible as its substrate for
 provisioning and orchestration. Kops performs the provisioning and orchestration
@ -10,8 +11,7 @@ however, is more tightly integrated with the unique features of the clouds it
 supports so it could be a better choice if you know that you will only be using
 one platform for the foreseeable future.

-Kubespray vs [Kubeadm](https://github.com/kubernetes/kubeadm)
------------------
+## Kubespray vs [Kubeadm](https://github.com/kubernetes/kubeadm)

 Kubeadm provides domain Knowledge of Kubernetes clusters' life cycle
 management, including self-hosted layouts, dynamic discovery services and so
--- a/docs/contiv.md
+++ b/docs/contiv.md
@ -1,5 +1,4 @@
-Contiv
-======
+# Contiv

 Here is the [Contiv documentation](http://contiv.github.io/documents/).

@ -10,7 +9,6 @@ There are two ways to manage Contiv:
 * a web UI managed by the api proxy service
 * a CLI named `netctl`

-
 ### Interfaces

 #### The Web Interface
@ -27,7 +25,6 @@ contiv_generate_certificate: true

 The default credentials to log in are: admin/admin.

-
 #### The Command Line Interface

 The second way to modify the Contiv configuration is to use the CLI. To do this, you have to connect to the server and export an environment variable to tell netctl how to connect to the cluster:
@ -44,7 +41,6 @@ contiv_netmaster_port: 9999

 The CLI doesn't use the authentication process needed by the web interface.

-
 ### Network configuration

 The default configuration uses VXLAN to create an overlay. Two networks are created by default:
--- a/docs/coreos.md
+++ b/docs/coreos.md
@ -6,6 +6,7 @@ Example with Ansible:
 Before running the cluster playbook you must satisfy the following requirements:

 General CoreOS Pre-Installation Notes:
+
 - Ensure that the bin_dir is set to `/opt/bin`
 - ansible_python_interpreter should be `/opt/bin/python`. This will be laid down by the bootstrap task.
 - The default resolvconf_mode setting of `docker_dns` **does not** work for CoreOS. This is because we do not edit the systemd service file for docker on CoreOS nodes. Instead, just use the `host_resolvconf` mode. It should work out of the box.
--- a/docs/cri-o.md
+++ b/docs/cri-o.md
@ -1,5 +1,4 @@
-CRI-O
-===============
+# CRI-O

 [CRI-O] is a lightweight container runtime for Kubernetes.
 Kubespray supports basic functionality for using CRI-O as the default container runtime in a cluster.
@ -10,14 +9,14 @@ Kubespray supports basic functionality for using CRI-O as the default container

 _To use CRI-O instead of Docker, set the following variables:_

-#### all.yml
+## all.yml

 ```yaml
 download_container: false
 skip_downloads: false
 ```

-#### k8s-cluster.yml
+## k8s-cluster.yml

 ```yaml
 etcd_deployment_type: host
--- a/docs/debian.md
+++ b/docs/debian.md
@ -1,5 +1,4 @@
-Debian Jessie
-===============
+# Debian Jessie

 Debian Jessie installation Notes:

@ -9,7 +8,7 @@ Debian Jessie installation Notes:
  
  to /etc/default/grub. Then update with
  
-  ```
+  ```ShellSession
   sudo update-grub
   sudo update-grub2
   sudo reboot
@ -23,7 +22,7 @@ Debian Jessie installation Notes:
  
 - Add the Ansible repository and install Ansible to get a proper version

-  ```
+  ```ShellSession
  sudo add-apt-repository ppa:ansible/ansible
  sudo apt-get update
  sudo apt-get install ansible
@ -34,5 +33,4 @@ Debian Jessie installation Notes:

  ```sudo apt-get install python-jinja2=2.8-1~bpo8+1 python-netaddr```
  
-  
 Now you can continue with [Preparing your deployment](getting-started.md#starting-custom-deployment)
--- a/docs/dns-stack.md
+++ b/docs/dns-stack.md
@ -1,5 +1,4 @@
-K8s DNS stack by Kubespray
-======================
+# K8s DNS stack by Kubespray

 For K8s cluster nodes, Kubespray configures a [Kubernetes DNS](http://kubernetes.io/docs/admin/dns/)
 [cluster add-on](http://releases.k8s.io/master/cluster/addons/README.md)
@ -9,19 +8,19 @@ to serve as an authoritative DNS server for a given ``dns_domain`` and its
 Other nodes in the inventory, like external storage nodes or a separate etcd cluster
 node group, considered non-cluster and left up to the user to configure DNS resolve.

-
-DNS variables
-=============
+## DNS variables

 There are several global variables which can be used to modify DNS settings:

-#### ndots
+### ndots
+
 ndots value to be used in ``/etc/resolv.conf``

 It is important to note that multiple search domains combined with high ``ndots``
 values lead to poor performance of DNS stack, so please choose it wisely.

-#### searchdomains
+### searchdomains
+
 Custom search domains to be added in addition to the cluster search domains (``default.svc.{{ dns_domain }}, svc.{{ dns_domain }}``).

 Most Linux systems limit the total number of search domains to 6 and the total length of all search domains
@ -30,57 +29,68 @@ to 256 characters. Depending on the length of ``dns_domain``, you're limited to
 Please note that ``resolvconf_mode: docker_dns`` will automatically add your systems search domains as
 additional search domains. Please take this into the accounts for the limits.

-#### nameservers
+### nameservers
+
 This variable is only used by ``resolvconf_mode: host_resolvconf``. These nameservers are added to the hosts
 ``/etc/resolv.conf`` *after* ``upstream_dns_servers`` and thus serve as backup nameservers. If this variable
 is not set, a default resolver is chosen (depending on cloud provider or 8.8.8.8 when no cloud provider is specified).

-#### upstream_dns_servers
+### upstream_dns_servers
+
 DNS servers to be added *after* the cluster DNS. Used by all ``resolvconf_mode`` modes. These serve as backup
 DNS servers in early cluster deployment when no cluster DNS is available yet.

-DNS modes supported by Kubespray
-============================
+## DNS modes supported by Kubespray

 You can modify how Kubespray sets up DNS for your cluster with the variables ``dns_mode`` and ``resolvconf_mode``.

-## dns_mode
+### dns_mode
+
 ``dns_mode`` configures how Kubespray will setup cluster DNS. There are four modes available:

-#### coredns (default)
+#### dns_mode: coredns (default)
+
 This installs CoreDNS as the default cluster DNS for all queries.

-#### coredns_dual
+#### dns_mode: coredns_dual
+
 This installs CoreDNS as the default cluster DNS for all queries, plus a secondary CoreDNS stack.

-#### manual
+#### dns_mode: manual
+
 This does not install coredns, but allows you to specify
 `manual_dns_server`, which will be configured on nodes for handling Pod DNS.
 Use this method if you plan to install your own DNS server in the cluster after
 initial deployment.

-#### none
+#### dns_mode: none
+
 This does not install any of DNS solution at all. This basically disables cluster DNS completely and
 leaves you with a non functional cluster.

 ## resolvconf_mode
+
 ``resolvconf_mode`` configures how Kubespray will setup DNS for ``hostNetwork: true`` PODs and non-k8s containers.
 There are three modes available:

-#### docker_dns (default)
+### resolvconf_mode: docker_dns (default)
+
 This sets up the docker daemon with additional --dns/--dns-search/--dns-opt flags.

 The following nameservers are added to the docker daemon (in the same order as listed here):
+
 * cluster nameserver (depends on dns_mode)
 * content of optional upstream_dns_servers variable
 * host system nameservers (read from hosts /etc/resolv.conf)

 The following search domains are added to the docker daemon (in the same order as listed here):
+
 * cluster domains (``default.svc.{{ dns_domain }}``, ``svc.{{ dns_domain }}``)
 * content of optional searchdomains variable
 * host system search domains (read from hosts /etc/resolv.conf)

 The following dns options are added to the docker daemon
+
 * ndots:{{ ndots }}
 * timeout:2
 * attempts:2
@ -96,7 +106,8 @@ DNS queries to the cluster DNS will timeout after a few seconds, resulting in th
 used as a backup nameserver. After cluster DNS is running, all queries will be answered by the cluster DNS
 servers, which in turn will forward queries to the system nameserver if required.

-#### host_resolvconf
+#### resolvconf_mode: host_resolvconf
+
 This activates the classic Kubespray behavior that modifies the hosts ``/etc/resolv.conf`` file and dhclient
 configuration to point to the cluster dns server (either coredns or coredns_dual, depending on dns_mode).

@ -108,21 +119,21 @@ the other nameservers as backups.
 Also note, existing records will be purged from the `/etc/resolv.conf`,
 including resolvconf's base/head/cloud-init config files and those that come from dhclient.

-#### none
+#### resolvconf_mode: none
+
 Does nothing regarding ``/etc/resolv.conf``. This leaves you with a cluster that works as expected in most cases.
 The only exception is that ``hostNetwork: true`` PODs and non-k8s managed containers will not be able to resolve
 cluster service names.

 ## Nodelocal DNS cache
+
 Setting ``enable_nodelocaldns`` to ``true`` will make pods reach out to the dns (core-dns) caching agent running on the same node, thereby avoiding iptables DNAT rules and connection tracking. The local caching agent will query core-dns (depending on what main DNS plugin is configured in your cluster) for cache misses of cluster hostnames(cluster.local suffix by default).

 More information on the rationale behind this implementation can be found [here](https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/0030-nodelocal-dns-cache.md).

 **As per the 2.10 release, Nodelocal DNS cache is enabled by default.**

-
-Limitations
-----------
+## Limitations

 * Kubespray has yet ways to configure Kubedns addon to forward requests SkyDns can
  not answer with authority to arbitrary recursive resolvers. This task is left
--- a/docs/downloads.md
+++ b/docs/downloads.md
@ -1,5 +1,4 @@
-Downloading binaries and containers
-===================================
+# Downloading binaries and containers

 Kubespray supports several download/upload modes. The default is:

@ -30,11 +29,13 @@ Container images may be defined by its repo and tag, for example:

 Note, the SHA256 digest and the image tag must be both specified and correspond
 to each other. The given example above is represented by the following vars:
+
 ```yaml
 dnsmasq_digest_checksum: 7c883354f6ea9876d176fe1d30132515478b2859d6fc0cbf9223ffdc09168193
 dnsmasq_image_repo: andyshinn/dnsmasq
 dnsmasq_image_tag: '2.72'
 ```
+
 The full list of available vars may be found in the download's ansible role defaults. Those also allow to specify custom urls and local repositories for binaries and container
 images as well. See also the DNS stack docs for the related intranet configuration,
 so the hosts can resolve those urls and repos.
--- a/docs/flannel.md
+++ b/docs/flannel.md
@ -1,9 +1,8 @@
-Flannel
-==============
+# Flannel

 * Flannel configuration file should have been created there

-```
+```ShellSession
 cat /run/flannel/subnet.env
 FLANNEL_NETWORK=10.233.0.0/18
 FLANNEL_SUBNET=10.233.16.1/24
@ -13,7 +12,7 @@ FLANNEL_IPMASQ=false

 * Check if the network interface has been created

-```
+```ShellSession
 ip a show dev flannel.1
 4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default
    link/ether e2:f3:a7:0f:bf:cb brd ff:ff:ff:ff:ff:ff
@ -25,7 +24,7 @@ ip a show dev flannel.1

 * Try to run a container and check its ip address

-```
+```ShellSession
 kubectl run test --image=busybox --command -- tail -f /dev/null
 replicationcontroller "test" created

@ -33,7 +32,7 @@ kubectl describe po test-34ozs | grep ^IP
 IP:                             10.233.16.2
 ```

-```
+```ShellSession
 kubectl exec test-34ozs -- ip a show dev eth0
 8: eth0@if9: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1450 qdisc noqueue
    link/ether 02:42:0a:e9:2b:03 brd ff:ff:ff:ff:ff:ff
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@ -1,8 +1,6 @@
-Getting started
-===============
+# Getting started

-Building your own inventory
---------------------------
+## Building your own inventory

 Ansible inventory can be stored in 3 formats: YAML, JSON, or INI-like. There is
 an example inventory located
@ -18,38 +16,41 @@ certain threshold. Run `python3 contrib/inventory_builder/inventory.py help` hel

 Example inventory generator usage:

-    cp -r inventory/sample inventory/mycluster
-    declare -a IPS=(10.10.1.3 10.10.1.4 10.10.1.5)
-    CONFIG_FILE=inventory/mycluster/hosts.yml python3 contrib/inventory_builder/inventory.py ${IPS[@]}
+```ShellSession
+cp -r inventory/sample inventory/mycluster
+declare -a IPS=(10.10.1.3 10.10.1.4 10.10.1.5)
+CONFIG_FILE=inventory/mycluster/hosts.yml python3 contrib/inventory_builder/inventory.py ${IPS[@]}
+```

 Then use `inventory/mycluster/hosts.yml` as inventory file.

-Starting custom deployment
--------------------------
+## Starting custom deployment

 Once you have an inventory, you may want to customize deployment data vars
 and start the deployment:

 **IMPORTANT**: Edit my\_inventory/groups\_vars/\*.yaml to override data vars:

-    ansible-playbook -i inventory/mycluster/hosts.yml cluster.yml -b -v \
+```ShellSession
+ansible-playbook -i inventory/mycluster/hosts.yml cluster.yml -b -v \
  --private-key=~/.ssh/private_key
+```

 See more details in the [ansible guide](ansible.md).

-Adding nodes
------------
+### Adding nodes

 You may want to add worker, master or etcd nodes to your existing cluster. This can be done by re-running the `cluster.yml` playbook, or you can target the bare minimum needed to get kubelet installed on the worker and talking to your masters. This is especially helpful when doing something like autoscaling your clusters.

 - Add the new worker node to your inventory in the appropriate group (or utilize a [dynamic inventory](https://docs.ansible.com/ansible/intro_dynamic_inventory.html)).
 - Run the ansible-playbook command, substituting `cluster.yml` for `scale.yml`:

-        ansible-playbook -i inventory/mycluster/hosts.yml scale.yml -b -v \
+```ShellSession
+ansible-playbook -i inventory/mycluster/hosts.yml scale.yml -b -v \
  --private-key=~/.ssh/private_key
+```

-Remove nodes
------------
+### Remove nodes

 You may want to remove **master**, **worker**, or **etcd** nodes from your
 existing cluster. This can be done by re-running the `remove-node.yml`
@ -61,10 +62,11 @@ when doing something like autoscaling your clusters. Of course, if a node
 is not working, you can remove the node and install it again.

 Use `--extra-vars "node=<nodename>,<nodename2>"` to select the node(s) you want to delete.
-```
+
+```ShellSession
 ansible-playbook -i inventory/mycluster/hosts.yml remove-node.yml -b -v \
-  --private-key=~/.ssh/private_key \
-  --extra-vars "node=nodename,nodename2"
+--private-key=~/.ssh/private_key \
+--extra-vars "node=nodename,nodename2"
 ```

 If a node is completely unreachable by ssh, add `--extra-vars reset_nodes=no`
@ -72,8 +74,7 @@ to skip the node reset step. If one node is unavailable, but others you wish
 to remove are able to connect via SSH, you could set reset_nodes=no as a host
 var in inventory.

-Connecting to Kubernetes
------------------------
+## Connecting to Kubernetes

 By default, Kubespray configures kube-master hosts with insecure access to
 kube-apiserver via port 8080. A kubeconfig file is not necessary in this case,
@ -95,8 +96,7 @@ file yourself.
 For more information on kubeconfig and accessing a Kubernetes cluster, refer to
 the Kubernetes [documentation](https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/).

-Accessing Kubernetes Dashboard
------------------------------
+## Accessing Kubernetes Dashboard

 As of kubernetes-dashboard v1.7.x:

@ -113,8 +113,7 @@ Or you can run 'kubectl proxy' from your local machine to access dashboard in yo

 It is recommended to access dashboard from behind a gateway (like Ingress Controller) that enforces an authentication token. Details and other access options here: <https://github.com/kubernetes/dashboard/wiki/Accessing-Dashboard---1.7.X-and-above>

-Accessing Kubernetes API
------------------------
+## Accessing Kubernetes API

 The main client of Kubernetes is `kubectl`. It is installed on each kube-master
 host and can optionally be configured on your ansible host by setting
@ -125,7 +124,9 @@ host and can optionally be configured on your ansible host by setting

 You can see a list of nodes by running the following commands:

-    cd inventory/mycluster/artifacts
-    ./kubectl.sh get nodes
+```ShellSession
+cd inventory/mycluster/artifacts
+./kubectl.sh get nodes
+```

 If desired, copy admin.conf to ~/.kube/config.
--- a/docs/ha-mode.md
+++ b/docs/ha-mode.md
@ -1,19 +1,18 @@
-HA endpoints for K8s
-====================
+# HA endpoints for K8s

 The following components require a highly available endpoints:
+
 * etcd cluster,
 * kube-apiserver service instances.

 The latter relies on a 3rd side reverse proxy, like Nginx or HAProxy, to
 achieve the same goal.

-Etcd
----
+## Etcd
+
 The etcd clients (kube-api-masters) are configured with the list of all etcd peers. If the etcd-cluster has multiple instances, it's configured in HA already.

-Kube-apiserver
--------------
+## Kube-apiserver

 K8s components require a loadbalancer to access the apiservers via a reverse
 proxy. Kubespray includes support for an nginx-based proxy that resides on each
@ -50,7 +49,8 @@ provides access for external clients, while the internal LB accepts client
 connections only to the localhost.
 Given a frontend `VIP` address and `IP1, IP2` addresses of backends, here is
 an example configuration for a HAProxy service acting as an external LB:
-```
+
+```raw
 listen kubernetes-apiserver-https
  bind <VIP>:8383
  option ssl-hello-chk
@ -66,7 +66,8 @@ listen kubernetes-apiserver-https

 And the corresponding example global vars for such a "cluster-aware"
 external LB with the cluster API access modes configured in Kubespray:
-```
+
+```yml
 apiserver_loadbalancer_domain_name: "my-apiserver-lb.example.com"
 loadbalancer_apiserver:
  address: <VIP>
@ -102,13 +103,14 @@ exclusive to `loadbalancer_apiserver_localhost`.
 Access API endpoints are evaluated automatically, as the following:

 | Endpoint type                | kube-master      | non-master              | external              |
-|------------------------------|----------------|---------------------|---------------------|
-| Local LB (default)           | https://bip:sp | https://lc:nsp      | https://m[0].aip:sp |
-| Local LB + Unmanaged here LB | https://bip:sp | https://lc:nsp      | https://ext         |
-| External LB, no internal     | https://bip:sp | https://lb:lp       | https://lb:lp       |
-| No ext/int LB                | https://bip:sp | https://m[0].aip:sp | https://m[0].aip:sp |
+|------------------------------|------------------|-------------------------|-----------------------|
+| Local LB (default)           | `https://bip:sp` | `https://lc:nsp`        | `https://m[0].aip:sp` |
+| Local LB + Unmanaged here LB | `https://bip:sp` | `https://lc:nsp`        | `https://ext`         |
+| External LB, no internal     | `https://bip:sp` | `<https://lb:lp>`       | `https://lb:lp`       |
+| No ext/int LB                | `https://bip:sp` | `<https://m[0].aip:sp>` | `https://m[0].aip:sp` |

 Where:
+
 * `m[0]` - the first node in the `kube-master` group;
 * `lb` - LB FQDN, `apiserver_loadbalancer_domain_name`;
 * `ext` - Externally load balanced VIP:port and FQDN, not managed by Kubespray;
@ -132,16 +134,19 @@ Kubespray, the masters' APIs are accessed via the insecure endpoint, which
 consists of the local `kube_apiserver_insecure_bind_address` and
 `kube_apiserver_insecure_port`.

-Optional configurations
------------------------
+## Optional configurations
+
 ### ETCD with a LB
+
 In order to use an external loadbalancing (L4/TCP or L7 w/ SSL Passthrough VIP), the following variables need to be overridden in group_vars
+
 * `etcd_access_addresses`
 * `etcd_client_url`
 * `etcd_cert_alt_names`
 * `etcd_cert_alt_ips`

 #### Example of a VIP w/ FQDN
+
 ```yaml
 etcd_access_addresses: https://etcd.example.com:2379
 etcd_client_url: https://etcd.example.com:2379
--- a/docs/integration.md
+++ b/docs/integration.md
@ -8,7 +8,8 @@
 2. Add **forked repo** as submodule to desired folder in your existent ansible repo(for example 3d/kubespray):
  ```git submodule add https://github.com/YOUR_GITHUB/kubespray.git kubespray```
  Git will create _.gitmodules_ file in your existent ansible repo:
-   ```
+
+   ```ini
   [submodule "3d/kubespray"]
         path = 3d/kubespray
         url = https://github.com/YOUR_GITHUB/kubespray.git
@ -21,7 +22,8 @@
 ```git remote add upstream https://github.com/kubernetes-sigs/kubespray.git```

 5. Sync your master branch with upstream:
-   ```
+
+   ```ShellSession
      git checkout master
      git fetch upstream
      git merge upstream/master
@ -33,7 +35,8 @@
    ***Never*** use master branch of your repository for your commits.

 7. Modify path to library and roles in your ansible.cfg file (role naming should be uniq, you may have to rename your existent roles if they have same names as kubespray project):
-   ```
+
+   ```ini
   ...
   library       = 3d/kubespray/library/
   roles_path    = 3d/kubespray/roles/
@ -45,7 +48,8 @@ You could rename *all.yml* config to something else, i.e. *kubespray.yml* and cr

 9. Modify your ansible inventory file by adding mapping of your existent groups (if any) to kubespray naming.
   For example:
-   ```
+
+   ```ini
     ...
     #Kargo groups:
     [kube-node:children]
@ -65,54 +69,62 @@ You could rename *all.yml* config to something else, i.e. *kubespray.yml* and cr
     [kubespray:children]
     kubernetes
     ```
+
     * Last entry here needed to apply kubespray.yml config file, renamed from all.yml of kubespray project.

 10. Now you can include kubespray tasks in you existent playbooks by including cluster.yml file:
-     ```
+
+     ```yml
     - name: Include kubespray tasks
       include: 3d/kubespray/cluster.yml
     ```
+
     Or your could copy separate tasks from cluster.yml into your ansible repository.

 11. Commit changes to your ansible repo. Keep in mind, that submodule folder is just a link to the git commit hash of your forked repo.
 When you update your "work" branch you need to commit changes to ansible repo as well.
 Other members of your team should use ```git submodule sync```, ```git submodule update --init``` to get actual code from submodule.

-# Contributing
+## Contributing
+
 If you made useful changes or fixed a bug in existent kubespray repo, use this flow for PRs to original kubespray repo.

-0. Sign the [CNCF CLA](https://git.k8s.io/community/CLA.md).
+1. Sign the [CNCF CLA](https://git.k8s.io/community/CLA.md).

-1. Change working directory to git submodule directory (3d/kubespray).
+2. Change working directory to git submodule directory (3d/kubespray).

-2. Setup desired user.name and user.email for submodule.
+3. Setup desired user.name and user.email for submodule.
 If kubespray is only one submodule in your repo you could use something like:
 ```git submodule foreach --recursive 'git config user.name "First Last" && git config user.email "your-email-addres@used.for.cncf"'```

-3. Sync with upstream master:
-   ```
+4. Sync with upstream master:
+
+   ```ShellSession
    git fetch upstream
    git merge upstream/master
    git push origin master
     ```
-4. Create new branch for the specific fixes that you want to contribute:
+
+5. Create new branch for the specific fixes that you want to contribute:
 ```git checkout -b fixes-name-date-index```
 Branch name should be self explaining to you, adding date and/or index will help you to track/delete your old PRs.

-5. Find git hash of your commit in "work" repo and apply it to newly created "fix" repo:
-     ```
+6. Find git hash of your commit in "work" repo and apply it to newly created "fix" repo:
+
+     ```ShellSession
     git cherry-pick <COMMIT_HASH>
     ```
-6. If your have several temporary-stage commits - squash them using [```git rebase -i```](http://eli.thegreenplace.net/2014/02/19/squashing-github-pull-requests-into-a-single-commit)
+
+7. If your have several temporary-stage commits - squash them using [```git rebase -i```](http://eli.thegreenplace.net/2014/02/19/squashing-github-pull-requests-into-a-single-commit)
 Also you could use interactive rebase (```git rebase -i HEAD~10```) to delete commits which you don't want to contribute into original repo.

-7. When your changes is in place, you need to check upstream repo one more time because it could be changed during your work.
+8. When your changes is in place, you need to check upstream repo one more time because it could be changed during your work.
 Check that you're on correct branch:
 ```git status```
 And pull changes from upstream (if any):
 ```git pull --rebase upstream master```

-8. Now push your changes to your **fork** repo with ```git push```. If your branch doesn't exists on github, git will propose you to use something like ```git push --set-upstream origin fixes-name-date-index```.
+9. Now push your changes to your **fork** repo with ```git push```. If your branch doesn't exists on github, git will propose you to use something like ```git push --set-upstream origin fixes-name-date-index```.

-9. Open you forked repo in browser, on the main page you will see proposition to create pull request for your newly created branch. Check proposed diff of your PR. If something is wrong you could safely delete "fix" branch on github using ```git push origin --delete fixes-name-date-index```, ```git branch -D fixes-name-date-index``` and start whole process from the beginning.
+10. Open you forked repo in browser, on the main page you will see proposition to create pull request for your newly created branch. Check proposed diff of your PR. If something is wrong you could safely delete "fix" branch on github using ```git push origin --delete fixes-name-date-index```, ```git branch -D fixes-name-date-index``` and start whole process from the beginning.
 If everything is fine - add description about your changes (what they do and why they're needed) and confirm pull request creation.
--- a/docs/kube-ovn.md
+++ b/docs/kube-ovn.md
@ -1,5 +1,5 @@
-Kube-OVN
-===========
+# Kube-OVN
+
 Kube-OVN integrates the OVN-based Network Virtualization with Kubernetes. It offers an advanced Container Network Fabric for Enterprises.

 For more information please check [Kube-OVN documentation](https://github.com/alauda/kube-ovn)
@ -7,7 +7,8 @@ For more information please check [Kube-OVN documentation](https://github.com/al
 ## How to use it

 Enable kube-ovn in `group_vars/k8s-cluster/k8s-cluster.yml`
-```
+
+```yml
 ...
 kube_network_plugin: kube-ovn
 ...
@ -19,7 +20,7 @@ Kube-OVN run ovn and controller in `kube-ovn` namespace

 * Check the status of kube-ovn pods

-```
+```ShellSession
 # From the CLI
 kubectl get pod -n kube-ovn

@ -37,7 +38,7 @@ ovs-ovn-r5frh                          1/1     Running   0          4d16h

 * Check the default and node subnet

-```
+```ShellSession
 # From the CLI
 kubectl get subnet

--- a/docs/kube-router.md
+++ b/docs/kube-router.md
@ -1,5 +1,4 @@
-Kube-router
-===========
+# Kube-router

 Kube-router is a L3 CNI provider, as such it will setup IPv4 routing between
 nodes to provide Pods' networks reachability.
@ -12,7 +11,7 @@ Kube-router runs its pods as a `DaemonSet` in the `kube-system` namespace:

 * Check the status of kube-router pods

-```
+```ShellSession
 # From the CLI
 kubectl get pod --namespace=kube-system -l k8s-app=kube-router -owide

@ -29,7 +28,7 @@ kube-router-x2xs7   1/1       Running   0          2d        192.168.186.10   my

 * Peek at kube-router container logs:

-```
+```ShellSession
 # From the CLI
 kubectl logs --namespace=kube-system -l k8s-app=kube-router | grep Peer.Up

@ -56,24 +55,24 @@ You need to `kubectl exec -it ...` into a kube-router container to use these, se

 ## Kube-router configuration

-
 You can change the default configuration by overriding `kube_router_...` variables
 (as found at `roles/network_plugin/kube-router/defaults/main.yml`),
 these are named to follow `kube-router` command-line options as per
 <https://www.kube-router.io/docs/user-guide/#try-kube-router-with-cluster-installers>.

 ## Advanced BGP Capabilities
-https://github.com/cloudnativelabs/kube-router#advanced-bgp-capabilities
+
+<https://github.com/cloudnativelabs/kube-router#advanced-bgp-capabilities>

 If you have other networking devices or SDN systems that talk BGP, kube-router will fit in perfectly.
 From a simple full node-to-node mesh to per-node peering configurations, most routing needs can be attained.
 The configuration is Kubernetes native (annotations) just like the rest of kube-router.

-For more details please refer to the https://github.com/cloudnativelabs/kube-router/blob/master/docs/bgp.md.
+For more details please refer to the <https://github.com/cloudnativelabs/kube-router/blob/master/docs/bgp.md.>

 Next options will set up annotations for kube-router, using `kubectl annotate` command.

-```
+```yml
 kube_router_annotations_master: []
 kube_router_annotations_node: []
 kube_router_annotations_all: []
--- a/docs/kubernetes-reliability.md
+++ b/docs/kubernetes-reliability.md
@ -26,7 +26,7 @@ By default the normal behavior looks like:
 > etcd in 6-7 seconds or even longer when etcd cannot commit data to quorum
 > nodes.

-# Failure
+## Failure

 Kubelet will try to make `nodeStatusUpdateRetry` post attempts. Currently
 `nodeStatusUpdateRetry` is constantly set to 5 in
@ -50,7 +50,7 @@ Kube proxy has a watcher over API. Once pods are evicted, Kube proxy will
 notice and will update iptables of the node. It will remove endpoints from
 services so pods from failed node won't be accessible anymore.

-# Recommendations for different cases
+## Recommendations for different cases

 ## Fast Update and Fast Reaction

--- a/docs/macvlan.md
+++ b/docs/macvlan.md
@ -1,20 +1,18 @@
-Macvlan
-===============
-
-How to use it :
-------------
+# Macvlan

+## How to use it

 * Enable macvlan in `group_vars/k8s-cluster/k8s-cluster.yml`
-```
+
+```yml
 ...
 kube_network_plugin: macvlan
 ...
 ```

-
 * Adjust the `macvlan_interface` in `group_vars/k8s-cluster/k8s-net-macvlan.yml` or by host in the `host.yml` file:
-```
+
+```yml
 all:
  hosts:
    node1:
@ -24,25 +22,20 @@ all:
      macvlan_interface: ens5
 ```

+## Issue encountered

-
-Issue encountered :
-------------
-
- Service DNS
+* Service DNS

 reply from unexpected source:

 add `kube_proxy_masquerade_all: true` in `group_vars/all/all.yml`

-
- Disable nodelocaldns
+* Disable nodelocaldns

 The nodelocal dns IP is not reacheable.

 Disable it in `sample/group_vars/k8s-cluster/k8s-cluster.yml`
-```
+
+```yml
 enable_nodelocaldns: false
 ```
-
-
--- a/docs/multus.md
+++ b/docs/multus.md
@ -1,5 +1,4 @@
-Multus
-===========
+# Multus

 Multus is a meta CNI plugin that provides multiple network interface support to
 pods. For each interface, Multus delegates CNI calls to secondary CNI plugins
@ -10,17 +9,19 @@ See [multus documentation](https://github.com/intel/multus-cni).
 ## Multus installation

 Since Multus itself does not implement networking, it requires a master plugin, which is specified through the variable `kube_network_plugin`. To enable Multus an additional variable `kube_network_plugin_multus` must be set to `true`. For example,
-```
+
+```yml
 kube_network_plugin: calico
 kube_network_plugin_multus: true
 ```
+
 will install Multus and Calico and configure Multus to use Calico as the primary network plugin.

 ## Using Multus

 Once Multus is installed, you can create CNI configurations (as a CRD objects) for additional networks, in this case a macvlan CNI configuration is defined. You may replace the config field with any valid CNI configuration where the CNI binary is available on the nodes.

-```
+```ShellSession
 cat <<EOF | kubectl create -f -
 apiVersion: "k8s.cni.cncf.io/v1"
 kind: NetworkAttachmentDefinition
@ -48,7 +49,7 @@ EOF

 You may then create a pod with and additional interface that connects to this network using annotations. The annotation correlates to the name in the NetworkAttachmentDefinition above.

-```
+```ShellSession
 cat <<EOF | kubectl create -f -
 apiVersion: v1
 kind: Pod
@ -66,8 +67,8 @@ EOF

 You may now inspect the pod and see that there is an additional interface configured:

-```
-$ kubectl exec -it samplepod -- ip a
+```ShellSession
+kubectl exec -it samplepod -- ip a
 ```

-For more details on how to use Multus, please visit https://github.com/intel/multus-cni
+For more details on how to use Multus, please visit <https://github.com/intel/multus-cni>
--- a/docs/netcheck.md
+++ b/docs/netcheck.md
@ -1,5 +1,4 @@
-Network Checker Application
-===========================
+# Network Checker Application

 With the ``deploy_netchecker`` var enabled (defaults to false), Kubespray deploys a
 Network Checker Application from the 3rd side `l23network/k8s-netchecker` docker
@ -14,14 +13,17 @@ logs.

 To get the most recent and cluster-wide network connectivity report, run from
 any of the cluster nodes:
-```
+
+```ShellSession
 curl http://localhost:31081/api/v1/connectivity_check
 ```
+
 Note that Kubespray does not invoke the check but only deploys the application, if
 requested.

 There are related application specific variables:
-```
+
+```yml
 netchecker_port: 31081
 agent_report_interval: 15
 netcheck_namespace: default
@ -33,7 +35,7 @@ combination of the ``netcheck_namespace.dns_domain`` vars, for example the
 to the non default namespace, make sure as well to adjust the ``searchdomains`` var
 so the resulting search domain records to contain that namespace, like:

-```
+```yml
 search: foospace.cluster.local default.cluster.local ...
 nameserver: ...
 ```
--- a/docs/opensuse.md
+++ b/docs/opensuse.md
@ -1,11 +1,10 @@
-openSUSE Leap 15.0 and Tumbleweed
-===============
+# openSUSE Leap 15.0 and Tumbleweed

 openSUSE Leap installation Notes:

 - Install Ansible

-  ```
+  ```ShellSession
  sudo zypper ref
  sudo zypper -n install ansible

@ -15,5 +14,4 @@ openSUSE Leap installation Notes:

  ```sudo zypper -n install python-Jinja2 python-netaddr```

-
 Now you can continue with [Preparing your deployment](getting-started.md#starting-custom-deployment)
--- a/docs/packet.md
+++ b/docs/packet.md
@ -1,5 +1,4 @@
-Packet
-===============
+# Packet

 Kubespray provides support for bare metal deployments using the [Packet bare metal cloud](http://www.packet.com).
 Deploying upon bare metal allows Kubernetes to run at locations where an existing public or private cloud might not exist such
@ -37,6 +36,7 @@ Terraform is required to deploy the bare metal infrastructure. The steps below a
 [More terraform installation options are available.](https://learn.hashicorp.com/terraform/getting-started/install.html)

 Grab the latest version of Terraform and install it.
+
 ```bash
 echo "https://releases.hashicorp.com/terraform/$(curl -s https://checkpoint-api.hashicorp.com/v1/check/terraform | jq -r -M '.current_version')/terraform_$(curl -s https://checkpoint-api.hashicorp.com/v1/check/terraform | jq -r -M '.current_version')_darwin_amd64.zip"
 sudo yum install unzip
@ -69,6 +69,7 @@ for Packet need to be defined. To find these values see [Packet API Integration]
 ```bash
 vi cluster.tfvars
 ```
+
 * cluster_name = alpha
 * packet_project_id = ABCDEFGHIJKLMNOPQRSTUVWXYZ123456
 * public_key_path = 12345678-90AB-CDEF-GHIJ-KLMNOPQRSTUV
@ -94,4 +95,3 @@ With the bare metal infrastructure deployed, Kubespray can now install Kubernete
 ```bash
 ansible-playbook --become -i inventory/alpha/hosts cluster.yml
 ```
-
--- a/docs/recover-control-plane.md
+++ b/docs/recover-control-plane.md
@ -1,6 +1,5 @@

-Recovering the control plane
-============================
+# Recovering the control plane

 To recover from broken nodes in the control plane use the "recover\-control\-plane.yml" playbook.

--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@ -1,14 +1,15 @@
-Kubespray's roadmap
-=================
+# Kubespray's roadmap
+
+## Self deployment (pull-mode) [#320](https://github.com/kubespray/kubespray/issues/320)

-### Self deployment (pull-mode) [#320](https://github.com/kubespray/kubespray/issues/320)
 - the playbook would install and configure docker and the etcd cluster
 - the following data would be inserted into etcd: certs,tokens,users,inventory,group_vars.
 - a "kubespray" container would be deployed (kubespray-cli, ansible-playbook)
 - to be discussed, a way to provide the inventory
 - **self deployment** of the node from inside a container [#321](https://github.com/kubespray/kubespray/issues/321)

-### Provisioning and cloud providers
+## Provisioning and cloud providers
+
 - [ ] Terraform to provision instances on:
  - [ ] GCE
  - [x] AWS (contrib/terraform/aws)
@ -20,35 +21,39 @@ Kubespray's roadmap
 - [ ] On Azure autoscaling, create loadbalancer [#297](https://github.com/kubespray/kubespray/issues/297)
 - [ ] On GCE be able to create a loadbalancer automatically (IAM ?) [#280](https://github.com/kubespray/kubespray/issues/280)
 - [x] **TLS bootstrap** support for kubelet (covered by kubeadm, but not in standard deployment) [#234](https://github.com/kubespray/kubespray/issues/234)
-  (related issues: https://github.com/kubernetes/kubernetes/pull/20439 <br>
-   https://github.com/kubernetes/kubernetes/issues/18112)
+  (related issues: <https://github.com/kubernetes/kubernetes/pull/20439> <https://github.com/kubernetes/kubernetes/issues/18112)>
+
+## Tests

-### Tests
 - [x] Run kubernetes e2e tests
 - [ ] Test idempotency on single OS but for all network plugins/container engines
 - [ ] single test on AWS per day
 - [ ] test scale up cluster:  +1 etcd, +1 master, +1 node
 - [x] Reorganize CI test vars into group var files

-### Lifecycle
+## Lifecycle
+
 - [ ] Upgrade granularity: select components to upgrade and skip others

-### Networking
+## Networking
+
 - [ ] Opencontrail
 - [ ] Consolidate roles/network_plugin and roles/kubernetes-apps/network_plugin

-### Kubespray API
+## Kubespray API
+
 - Perform all actions through an **API**
 - Store inventories / configurations of multiple clusters
 - Make sure that state of cluster is completely saved in no more than one config file beyond hosts inventory

-### Addons (helm or native ansible)
+## Addons (helm or native ansible)
+
 - [x] Helm
 - [x] Ingress-nginx
 - [x] kubernetes-dashboard

+## Others

-### Others
 - Organize and update documentation (split in categories)
 - Refactor downloads so it all runs in the beginning of deployment
 - Make bootstrapping OS more consistent
--- a/docs/test_cases.md
+++ b/docs/test_cases.md
@ -1,9 +1,7 @@
-Node Layouts
------------
+# Node Layouts

 There are four node layout types: `default`, `separate`, `ha`, and `scale`.

-
 `default` is a non-HA two nodes setup with one separate `kube-node`
 and the `etcd` group merged with the `kube-master`.

@ -20,8 +18,7 @@ never actually deployed, but certificates are generated for them.

 Note, the canal network plugin deploys flannel as well plus calico policy controller.

-GCE instances
-------------
+## GCE instances

 |               Stage|      Network plugin|             OS type|          GCE region|        Nodes layout
 |--------------------|--------------------|--------------------|--------------------|--------------------|
--- a/docs/upgrades.md
+++ b/docs/upgrades.md
@ -1,7 +1,4 @@
-Upgrading Kubernetes in Kubespray
-=============================
-
-#### Description
+# Upgrading Kubernetes in Kubespray

 Kubespray handles upgrades the same way it handles initial deployment. That is to
 say that each component is laid down in a fixed order.
@ -22,22 +19,22 @@ versions. Here are all version vars for each component:

 See [Multiple Upgrades](#multiple-upgrades) for how to upgrade from older releases to the latest release

-#### Unsafe upgrade example
+## Unsafe upgrade example

 If you wanted to upgrade just kube_version from v1.4.3 to v1.4.6, you could
 deploy the following way:

-```
+```ShellSession
 ansible-playbook cluster.yml -i inventory/sample/hosts.ini -e kube_version=v1.4.3
 ```

 And then repeat with v1.4.6 as kube_version:

-```
+```ShellSession
 ansible-playbook cluster.yml -i inventory/sample/hosts.ini -e kube_version=v1.4.6
 ```

-#### Graceful upgrade
+## Graceful upgrade

 Kubespray also supports cordon, drain and uncordoning of nodes when performing
 a cluster upgrade. There is a separate playbook used for this purpose. It is
@ -45,19 +42,19 @@ important to note that upgrade-cluster.yml can only be used for upgrading an
 existing cluster. That means there must be at least 1 kube-master already
 deployed.

-```
+```ShellSession
 ansible-playbook upgrade-cluster.yml -b -i inventory/sample/hosts.ini -e kube_version=v1.6.0
 ```

 After a successful upgrade, the Server Version should be updated:

-```
+```ShellSession
 $ kubectl version
 Client Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.0", GitCommit:"fff5156092b56e6bd60fff75aad4dc9de6b6ef37", GitTreeState:"clean", BuildDate:"2017-03-28T19:15:41Z", GoVersion:"go1.8", Compiler:"gc", Platform:"darwin/amd64"}
 Server Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.0+coreos.0", GitCommit:"8031716957d697332f9234ddf85febb07ac6c3e3", GitTreeState:"clean", BuildDate:"2017-03-29T04:33:09Z", GoVersion:"go1.7.5", Compiler:"gc", Platform:"linux/amd64"}
 ```

-#### Multiple upgrades
+## Multiple upgrades

 :warning: [Do not skip releases when upgrading--upgrade by one tag at a time.](https://github.com/kubernetes-sigs/kubespray/issues/3849#issuecomment-451386515) :warning:

@ -71,7 +68,7 @@ Assuming you don't explicitly define a kubernetes version in your k8s-cluster.ym

 The below example shows taking a cluster that was set up for v2.6.0 up to v2.10.0

-```
+```ShellSession
 $ kubectl get node
 NAME      STATUS    ROLES         AGE       VERSION
 apollo    Ready     master,node   1h        v1.10.4
@ -96,7 +93,7 @@ HEAD is now at 05dabb7e Fix Bionic networking restart error #3430 (#3431)

 # NOTE: May need to sudo pip3 install -r requirements.txt when upgrading.

-$ ansible-playbook -i inventory/mycluster/hosts.ini -b upgrade-cluster.yml
+ansible-playbook -i inventory/mycluster/hosts.ini -b upgrade-cluster.yml

 ...

@ -117,7 +114,7 @@ Some deprecations between versions that mean you can't just upgrade straight fro

 In this case, I set "kubeadm_enabled" to false, knowing that it is deprecated and removed by 2.9.0, to delay converting the cluster to kubeadm as long as I could.

-```
+```ShellSession
 $ ansible-playbook -i inventory/mycluster/hosts.ini -b upgrade-cluster.yml
 ...
    "msg": "DEPRECATION: non-kubeadm deployment is deprecated from v2.9. Will be removed in next release."
@ -233,8 +230,8 @@ If you do not keep your inventory copy up to date, **your upgrade will fail** an

 It is at this point the cluster was upgraded from non-kubeadm to kubeadm as per the deprecation warning.

-```
-$ ansible-playbook -i inventory/mycluster/hosts.ini -b upgrade-cluster.yml
+```ShellSession
+ansible-playbook -i inventory/mycluster/hosts.ini -b upgrade-cluster.yml

 ...

@ -259,7 +256,7 @@ $ git checkout v2.10.0
 Previous HEAD position was a4e65c7c Upgrade to Ansible >2.7.0 (#4471)
 HEAD is now at dcd9c950 Add etcd role dependency on kube user to avoid etcd role failure when running scale.yml with a fresh node. (#3240) (#4479)

-$ ansible-playbook -i inventory/mycluster/hosts.ini -b upgrade-cluster.yml
+ansible-playbook -i inventory/mycluster/hosts.ini -b upgrade-cluster.yml

 ...

@ -272,8 +269,7 @@ caprica   Ready    master,node   7h40m   v1.14.1

 ```

-
-#### Upgrade order
+## Upgrade order

 As mentioned above, components are upgraded in the order in which they were
 installed in the Ansible playbook. The order of component installation is as
@ -286,7 +282,7 @@ follows:
 * kube-apiserver, kube-scheduler, and kube-controller-manager
 * Add-ons (such as KubeDNS)

-#### Upgrade considerations
+## Upgrade considerations

 Kubespray supports rotating certificates used for etcd and Kubernetes
 components, but some manual steps may be required. If you have a pod that
@ -312,48 +308,48 @@ hosts.

 Upgrade docker:

-```
+```ShellSession
 ansible-playbook -b -i inventory/sample/hosts.ini cluster.yml --tags=docker
 ```

 Upgrade etcd:

-```
+```ShellSession
 ansible-playbook -b -i inventory/sample/hosts.ini cluster.yml --tags=etcd
 ```

 Upgrade vault:

-```
+```ShellSession
 ansible-playbook -b -i inventory/sample/hosts.ini cluster.yml --tags=vault
 ```

 Upgrade kubelet:

-```
+```ShellSession
 ansible-playbook -b -i inventory/sample/hosts.ini cluster.yml --tags=node --skip-tags=k8s-gen-certs,k8s-gen-tokens
 ```

 Upgrade Kubernetes master components:

-```
+```ShellSession
 ansible-playbook -b -i inventory/sample/hosts.ini cluster.yml --tags=master
 ```

 Upgrade network plugins:

-```
+```ShellSession
 ansible-playbook -b -i inventory/sample/hosts.ini cluster.yml --tags=network
 ```

 Upgrade all add-ons:

-```
+```ShellSession
 ansible-playbook -b -i inventory/sample/hosts.ini cluster.yml --tags=apps
 ```

 Upgrade just helm (assuming `helm_enabled` is true):

-```
+```ShellSession
 ansible-playbook -b -i inventory/sample/hosts.ini cluster.yml --tags=helm
 ```
--- a/docs/vagrant.md
+++ b/docs/vagrant.md
@ -1,5 +1,4 @@
-Introduction
-============
+# Vagrant

 Assuming you have Vagrant 2.0+ installed with virtualbox, libvirt/qemu or vmware, but is untested) you should be able to launch a 3 node Kubernetes cluster by simply running `vagrant up`. This will spin up 3 VMs and install kubernetes on them.  Once they are completed you can connect to any of them by running `vagrant ssh k8s-[1..3]`.

@ -7,33 +6,31 @@ To give an estimate of the expected duration of a provisioning run: On a dual co

 For proper performance a minimum of 12GB RAM is recommended. It is possible to run a 3 node cluster on a laptop with 8GB of RAM using the default Vagrantfile, provided you have 8GB zram swap configured and not much more than a browser and a mail client running. If you decide to run on such a machine, then also make sure that any tmpfs devices, that are mounted, are mostly empty and disable any swapfiles mounted on HDD/SSD or you will be in for some serious swap-madness. Things can get a bit sluggish during provisioning, but when that's done, the system will actually be able to perform quite well.

-Customize Vagrant
-=================
+## Customize Vagrant

 You can override the default settings in the `Vagrantfile` either by directly modifying the `Vagrantfile` or through an override file. In the same directory as the `Vagrantfile`, create a folder called `vagrant` and create `config.rb` file in it. An example of how to configure this file is given below.

-Use alternative OS for Vagrant
-==============================
+## Use alternative OS for Vagrant

 By default, Vagrant uses Ubuntu 18.04 box to provision a local cluster. You may use an alternative supported operating system for your local cluster.

 Customize `$os` variable in `Vagrantfile` or as override, e.g.,:

-    echo '$os = "coreos-stable"' >> vagrant/config.rb
+```ShellSession
+echo '$os = "coreos-stable"' >> vagrant/config.rb
+```

 The supported operating systems for vagrant are defined in the `SUPPORTED_OS` constant in the `Vagrantfile`.

-File and image caching
-======================
+## File and image caching

 Kubespray can take quite a while to start on a laptop. To improve provisioning speed, the variable 'download_run_once' is set. This will make kubespray download all files and containers just once and then redistributes them to the other nodes and as a bonus, also cache all downloads locally and re-use them on the next provisioning run. For more information on download settings see [download documentation](downloads.md).

-Example use of Vagrant
-======================
+## Example use of Vagrant

 The following is an example of setting up and running kubespray using `vagrant`. For repeated runs, you could save the script to a file in the root of the kubespray and run it by executing 'source <name_of_the_file>.

-```
+```ShellSession
 # use virtualenv to install all python requirements
 VENVDIR=venv
 virtualenv --python=/usr/bin/python3.7 $VENVDIR
@ -76,28 +73,38 @@ sudo ln -s $INV/artifacts/kubectl /usr/local/bin/kubectl
 #or
 export PATH=$PATH:$INV/artifacts
 ```
+
 If a vagrant run failed and you've made some changes to fix the issue causing the fail, here is how you would re-run ansible:
-```
+
+```ShellSession
 ansible-playbook -vvv -i .vagrant/provisioners/ansible/inventory/vagrant_ansible_inventory cluster.yml
 ```
+
 If all went well, you check if it's all working as expected:
-```
+
+```ShellSession
 kubectl get nodes
 ```
+
 The output should look like this:
-```
+
+```ShellSession
 $ kubectl get nodes
 NAME    STATUS   ROLES    AGE   VERSION
 kub-1   Ready    master   32m   v1.14.1
 kub-2   Ready    master   31m   v1.14.1
 kub-3   Ready    <none>   31m   v1.14.1
 ```
+
 Another nice test is the following:
-```
+
+```ShellSession
 kubectl get po --all-namespaces -o wide
 ```
+
 Which should yield something like the following:
-```
+
+```ShellSession
 NAMESPACE     NAME                                    READY   STATUS    RESTARTS   AGE   IP            NODE     NOMINATED NODE   READINESS GATES
 kube-system   coredns-97c4b444f-9wm86                 1/1     Running   0          31m   10.233.66.2   kub-3    <none>           <none>
 kube-system   coredns-97c4b444f-g7hqx                 0/1     Pending   0          30m   <none>        <none>   <none>           <none>
@ -120,10 +127,12 @@ kube-system   nodelocaldns-2x7vh                      1/1     Running   0
 kube-system   nodelocaldns-fpvnz                      1/1     Running   0          31m   10.0.20.103   kub-3    <none>           <none>
 kube-system   nodelocaldns-h2f42                      1/1     Running   0          31m   10.0.20.101   kub-1    <none>           <none>
 ```
+
 Create clusteradmin rbac and get the login token for the dashboard:
-```
+
+```ShellSession
 kubectl create -f contrib/misc/clusteradmin-rbac.yml
 kubectl -n kube-system describe secret kubernetes-dashboard-token | grep 'token:' | grep -o '[^ ]\+$'
 ```
-Copy it to the clipboard and now log in to the [dashboard](https://10.0.20.101:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/#!/login).

+Copy it to the clipboard and now log in to the [dashboard](https://10.0.20.101:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/#!/login).
--- a/docs/vars.md
+++ b/docs/vars.md
@ -1,7 +1,6 @@
-Configurable Parameters in Kubespray
-================================
+# Configurable Parameters in Kubespray

-#### Generic Ansible variables
+## Generic Ansible variables

 You can view facts gathered by Ansible automatically
 [here](http://docs.ansible.com/ansible/playbooks_variables.html#information-discovered-from-systems-facts).
@ -12,7 +11,7 @@ Some variables of note include:
 * *ansible_default_ipv4.address*: IP address Ansible automatically chooses.
  Generated based on the output from the command ``ip -4 route get 8.8.8.8``

-#### Common vars that are used in Kubespray
+## Common vars that are used in Kubespray

 * *calico_version* - Specify version of Calico to use
 * *calico_cni_version* - Specify version of Calico CNI plugin to use
@ -28,7 +27,7 @@ Some variables of note include:
 * *nameservers* - Array of nameservers to use for DNS lookup
 * *preinstall_selinux_state* - Set selinux state, permitted values are permissive and disabled.

-#### Addressing variables
+## Addressing variables

 * *ip* - IP to use for binding services (host var)
 * *access_ip* - IP for other hosts to use to connect to. Often required when
@ -45,7 +44,7 @@ Some variables of note include:
  `loadbalancer_apiserver`. See more details in the
  [HA guide](https://github.com/kubernetes-sigs/kubespray/blob/master/docs/ha-mode.md).

-#### Cluster variables
+## Cluster variables

 Kubernetes needs some parameters in order to get deployed. These are the
 following default cluster parameters:
@ -86,7 +85,7 @@ Note, if cloud providers have any use of the ``10.233.0.0/16``, like instances'
 private addresses, make sure to pick another values for ``kube_service_addresses``
 and ``kube_pods_subnet``, for example from the ``172.18.0.0/16``.

-#### DNS variables
+## DNS variables

 By default, hosts are set up with 8.8.8.8 as an upstream DNS server and all
 other settings from your existing /etc/resolv.conf are lost. Set the following
@ -100,7 +99,7 @@ variables to match your requirements.
 For more information, see [DNS
 Stack](https://github.com/kubernetes-sigs/kubespray/blob/master/docs/dns-stack.md).

-#### Other service variables
+## Other service variables

 * *docker_options* - Commonly used to set
  ``--insecure-registry=myregistry.mydomain:5000``
@ -125,20 +124,24 @@ Stack](https://github.com/kubernetes-sigs/kubespray/blob/master/docs/dns-stack.m
 * *node_labels* - Labels applied to nodes via kubelet --node-labels parameter.
  For example, labels can be set in the inventory as variables or more widely in group_vars.
  *node_labels* can be defined either as a dict or a comma-separated labels string:
-```
+
+```yml
 node_labels:
  label1_name: label1_value
  label2_name: label2_value

 node_labels: "label1_name=label1_value,label2_name=label2_value"
 ```
+
 * *node_taints* - Taints applied to nodes via kubelet --register-with-taints parameter.
  For example, taints can be set in the inventory as variables or more widely in group_vars.
  *node_taints* has to be defined as a list of strings in format `key=value:effect`, e.g.:
-```
+
+```yml
 node_taints:
  - "node.example.com/external=true:NoSchedule"
 ```
+
 * *podsecuritypolicy_enabled* - When set to `true`, enables the PodSecurityPolicy admission controller and defines two policies `privileged` (applying to all resources in `kube-system` namespace and kubelet) and `restricted` (applying all other namespaces).
  Addons deployed in kube-system namespaces are handled.
 * *kubernetes_audit* - When set to `true`, enables Auditing.
@ -151,25 +154,30 @@ node_taints:

  By default, the `audit_policy_file` contains [default rules](https://github.com/kubernetes-sigs/kubespray/blob/master/roles/kubernetes/master/templates/apiserver-audit-policy.yaml.j2) that can be overridden with the `audit_policy_custom_rules` variable.

-##### Custom flags for Kube Components
+### Custom flags for Kube Components
+
 For all kube components, custom flags can be passed in. This allows for edge cases where users need changes to the default deployment that may not be applicable to all deployments. This can be done by providing a list of flags. The `kubelet_node_custom_flags` apply kubelet settings only to nodes and not masters. Example:
-```
+
+```yml
 kubelet_custom_flags:
  - "--eviction-hard=memory.available<100Mi"
  - "--eviction-soft-grace-period=memory.available=30s"
  - "--eviction-soft=memory.available<300Mi"
 ```
+
 The possible vars are:
+
 * *kubelet_custom_flags*
 * *kubelet_node_custom_flags*

 Extra flags for the API server, controller, and scheduler components can be specified using these variables,
 in the form of dicts of key-value pairs of configuration parameters that will be inserted into the kubeadm YAML config file:
+
 * *kube_kubeadm_apiserver_extra_args*
 * *kube_kubeadm_controller_extra_args*
 * *kube_kubeadm_scheduler_extra_args*

-#### User accounts
+## User accounts

 By default, a user with admin rights is created, named `kube`.
 The password can be viewed after deployment by looking at the file
--- a/docs/vsphere.md
+++ b/docs/vsphere.md
@ -1,6 +1,7 @@
 # vSphere cloud provider

 Kubespray can be deployed with vSphere as Cloud provider. This feature supports
+
 - Volumes
 - Persistent Volumes
 - Storage Classes and provisioning of volumes.
@ -11,15 +12,16 @@ Kubespray can be deployed with vSphere as Cloud provider. This feature supports
 You need at first to configure your vSphere environment by following the [official documentation](https://kubernetes.io/docs/getting-started-guides/vsphere/#vsphere-cloud-provider).

 After this step you should have:
+
 - UUID activated for each VM where Kubernetes will be deployed
 - A vSphere account with required privileges

 If you intend to leverage the [zone and region node labeling](https://kubernetes.io/docs/reference/kubernetes-api/labels-annotations-taints/#failure-domain-beta-kubernetes-io-region), create a tag category for both the zone and region in vCenter.  The tags can then be applied at the host, cluster, datacenter, or folder level, and the cloud provider will walk the hierarchy to extract and apply the labels to the Kubernetes nodes.

-
 ## Kubespray configuration

 First you must define the cloud provider in `inventory/sample/group_vars/all.yml` and set it to `vsphere`.
+
 ```yml
 cloud_provider: vsphere
 ```
@ -61,7 +63,8 @@ vsphere_resource_pool: "K8s-Pool"
 ## Deployment

 Once the configuration is set, you can execute the playbook again to apply the new configuration
-```
+
+```ShellSession
 cd kubespray
 ansible-playbook -i inventory/sample/hosts.ini -b -v cluster.yml
 ```
--- a/docs/weave.md
+++ b/docs/weave.md
@ -1,5 +1,4 @@
-Weave
-=======
+# Weave

 Weave 2.0.1 is supported by kubespray

@ -11,7 +10,7 @@ Weave encryption is supported for all communication

 * To use Weave encryption, specify a strong password (if no password, no encryption)

-```
+```ShellSession
 # In file ./inventory/sample/group_vars/k8s-cluster.yml
 weave_password: EnterPasswordHere
 ```
@ -22,18 +21,19 @@ Weave is deployed by kubespray using a daemonSet

 * Check the status of Weave containers

-```
+```ShellSession
 # From client
 kubectl -n kube-system get pods | grep weave
 # output
 weave-net-50wd2                       2/2       Running   0          2m
 weave-net-js9rb                       2/2       Running   0          2m
 ```
+
 There must be as many pods as nodes (here kubernetes have 2 nodes so there are 2 weave pods).

 * Check status of weave (connection,encryption ...) for each node

-```
+```ShellSession
 # On nodes
 curl http://127.0.0.1:6784/status
 # output on node1
@ -57,14 +57,14 @@ Version: 2.0.1 (up to date; next check at 2017/08/01 13:51:34)

 * Check parameters of weave for each node

-```
+```ShellSession
 # On nodes
 ps -aux | grep weaver
 # output on node1 (here its use seed mode)
 root      8559  0.2  3.0 365280 62700 ?        Sl   08:25   0:00 /home/weave/weaver --name=fa:16:3e:b3:d6:b2 --port=6783 --datapath=datapath --host-root=/host --http-addr=127.0.0.1:6784 --status-addr=0.0.0.0:6782 --docker-api= --no-dns --db-prefix=/weavedb/weave-net --ipalloc-range=10.233.64.0/18 --nickname=node1 --ipalloc-init seed=fa:16:3e:b3:d6:b2,fa:16:3e:f0:50:53 --conn-limit=30 --expect-npc 192.168.208.28 192.168.208.19
 ```

-### Consensus mode (default mode)
+## Consensus mode (default mode)

 This mode is best to use on static size cluster

@ -76,14 +76,14 @@ The seed mode also allows multi-clouds and hybrid on-premise/cloud clusters depl

 * Switch from consensus mode to seed mode

-```
+```ShellSession
 # In file ./inventory/sample/group_vars/k8s-cluster.yml
 weave_mode_seed: true
 ```

 These two variables are only used when `weave_mode_seed` is set to `true` (**/!\ do not manually change these values**)

-```
+```ShellSession
 # In file ./inventory/sample/group_vars/k8s-cluster.yml
 weave_seed: uninitialized
 weave_peers: uninitialized