Fix markdownlint failures under ./roles/ (#7089)

This fixes markdownlint failures under roles/

.gitlab-ci/lint.yml

@@ -66,8 +66,7 @@ markdownlint:
   before_script:
     - npm install -g markdownlint-cli@0.22.0
   script:
-    # TODO: Remove "grep -v" part to enable markdownlint for all md files
-    - markdownlint $(find . -name "*.md" | grep -v .github | grep -v roles) --ignore docs/_sidebar.md --ignore contrib/dind/README.md
+    - markdownlint $(find . -name "*.md" | grep -v .github) --ignore docs/_sidebar.md --ignore contrib/dind/README.md
 
 ci-matrix:
   stage: unit-tests

contrib/terraform/gcp/README.md

@@ -6,7 +6,7 @@ Provision a Kubernetes cluster on GCP using Terraform and Kubespray
 
 The setup looks like following
 
-```
+```text
                            Kubernetes cluster
                         +-----------------------+
 +---------------+       |   +--------------+    |

roles/bootstrap-os/README.md

@@ -3,15 +3,16 @@
 Bootstrap an Ansible host to be able to run Ansible modules.
 
 This role will:
-  * configure the package manager (if applicable) to be able to fetch packages
-  * install Python
-  * install the necessary packages to use Ansible's package manager modules
-  * set the hostname of the host to `{{ inventory_hostname }}` when requested
+
+* configure the package manager (if applicable) to be able to fetch packages
+* install Python
+* install the necessary packages to use Ansible's package manager modules
+* set the hostname of the host to `{{ inventory_hostname }}` when requested
 
 ## Requirements
 
 A host running an operating system that is supported by Kubespray.
-See https://github.com/kubernetes-sigs/kubespray#supported-linux-distributions for a current list.
+See [Supported Linux Distributions](https://github.com/kubernetes-sigs/kubespray#supported-linux-distributions) for a current list.
 
 SSH access to the host.
 
@@ -21,10 +22,10 @@ Variables are listed with their default values, if applicable.
 
 ### General variables
 
-  * `http_proxy`/`https_proxy`
+* `http_proxy`/`https_proxy`
   The role will configure the package manager (if applicable) to download packages via a proxy.
 
-  * `override_system_hostname: true`
+* `override_system_hostname: true`
   The role will set the hostname of the machine to the name it has according to Ansible's inventory (the variable `{{ inventory_hostname }}`).
 
 ### Per distribution variables

roles/kubernetes-apps/external_provisioner/cephfs_provisioner/README.md

@@ -25,7 +25,7 @@ Test instruction
 
 - Start Kubernetes local cluster
 
-See <a href="https://kubernetes.io/" class="uri" class="uri">https://kubernetes.io/</a>.
+See [Kubernetes](https://kubernetes.io/)
 
 - Create a Ceph admin secret
 
@@ -47,7 +47,7 @@ Alternatively, deploy it in kubernetes, see [deployment](deploy/README.md).
 
 - Create a CephFS Storage Class
 
-Replace Ceph monitor's IP in <a href="example/class.yaml" class="uri" class="uri">example/class.yaml</a> with your own and create storage class:
+Replace Ceph monitor's IP in [example class](example/class.yaml) with your own and create storage class:
 
 ``` bash
 kubectl create -f example/class.yaml

roles/kubernetes-apps/external_provisioner/local_volume_provisioner/README.md

@@ -50,7 +50,7 @@ the rest of this doc will use that path as an example.
 Examples to create local storage volumes
 ----------------------------------------
 
-### tmpfs method:
+1. tmpfs method:
 
 ``` bash
 for vol in vol1 vol2 vol3; do
@@ -62,7 +62,7 @@ done
 The tmpfs method is not recommended for production because the mount is not
 persistent and data will be deleted on reboot.
 
-### Mount physical disks
+1. Mount physical disks
 
 ``` bash
 mkdir /mnt/disks/ssd1
@@ -72,8 +72,7 @@ mount /dev/vdb1 /mnt/disks/ssd1
 Physical disks are recommended for production environments because it offers
 complete isolation in terms of I/O and capacity.
 
-### Mount unpartitioned physical devices
-
+1. Mount unpartitioned physical devices
 
 ``` bash
 for disk in /dev/sdc /dev/sdd /dev/sde; do
@@ -85,7 +84,7 @@ This saves time of precreatnig filesystems. Note that your storageclass must hav
 volume_mode set to "Filesystem" and fs_type defined. If either is not set, the
 disk will be added as a raw block device.
 
-### File-backed sparsefile method
+1. File-backed sparsefile method
 
 ``` bash
 truncate /mnt/disks/disk5 --size 2G
@@ -97,12 +96,12 @@ mount /mnt/disks/disk5 /mnt/disks/vol5
 If you have a development environment and only one disk, this is the best way
 to limit the quota of persistent volumes.
 
-### Simple directories
+1. Simple directories
 
 In a development environment using `mount --bind` works also, but there is no capacity
 management.
 
-### Block volumeMode PVs
+1. Block volumeMode PVs
 
 Create a symbolic link under discovery directory to the block device on the node. To use
 raw block devices in pods, volume_type should be set to "Block".

roles/kubernetes-apps/external_provisioner/rbd_provisioner/README.md

@@ -26,7 +26,7 @@ make push
 
 * Start Kubernetes local cluster
 
-See https://kubernetes.io/.
+See [Kubernetes](https://kubernetes.io/).
 
 * Create a Ceph admin secret
 
@@ -76,4 +76,4 @@ kubectl create -f examples/test-pod.yaml
 
 ## Acknowledgements
 
-- This provisioner is extracted from [Kubernetes core](https://github.com/kubernetes/kubernetes) with some modifications for this project.
+* This provisioner is extracted from [Kubernetes core](https://github.com/kubernetes/kubernetes) with some modifications for this project.

roles/kubernetes-apps/ingress_controller/alb_ingress_controller/README.md

@@ -17,6 +17,7 @@ Checkout our [Live Docs](https://kubernetes-sigs.github.io/aws-alb-ingress-contr
 To get started with the controller, see our [walkthrough](https://kubernetes-sigs.github.io/aws-alb-ingress-controller/guide/walkthrough/echoserver/).
 
 ## Setup
+
 - See [controller setup](https://kubernetes-sigs.github.io/aws-alb-ingress-controller/guide/controller/setup/) on how to install ALB ingress controller
 - See [external-dns setup](https://kubernetes-sigs.github.io/aws-alb-ingress-controller/guide/external-dns/setup/) for how to setup the external-dns to manage route 53 records.
 

roles/kubernetes-apps/ingress_controller/ambassador/README.md

@@ -24,10 +24,10 @@ versions of Ambassador as they become available.
 
 ## Configuration
 
-* `ingress_ambassador_namespace` (default `ambassador`): namespace for installing Ambassador.
-* `ingress_ambassador_update_window` (default `0 0 * * SUN`): _crontab_-like expression
+- `ingress_ambassador_namespace` (default `ambassador`): namespace for installing Ambassador.
+- `ingress_ambassador_update_window` (default `0 0 * * SUN`): _crontab_-like expression
   for specifying when the Operator should try to update the Ambassador API Gateway.
-* `ingress_ambassador_version` (defaulkt: `*`): SemVer rule for versions allowed for
+- `ingress_ambassador_version` (defaulkt: `*`): SemVer rule for versions allowed for
   installation/updates.
 
 ## Ingress annotations

roles/kubernetes-apps/ingress_controller/cert_manager/README.md

@@ -87,12 +87,12 @@ For further information, read the official [Cert-Manager Ingress](https://cert-m
 
 ### Create New TLS Root CA Certificate and Key
 
-#### Install Cloudflare PKI/TLS `cfssl` Toolkit.
+#### Install Cloudflare PKI/TLS `cfssl` Toolkit
 
 e.g. For Ubuntu/Debian distibutions, the toolkit is part of the `golang-cfssl` package.
 
 ```shell
-$ sudo apt-get install -y golang-cfssl
+sudo apt-get install -y golang-cfssl
 ```
 
 #### Create Root Certificate Authority (CA) Configuration File

roles/kubernetes-apps/ingress_controller/ingress_nginx/README.md

@@ -25,11 +25,12 @@
 
 !!! attention
     If you're using GKE you need to initialize your user as a cluster-admin with the following command:
-    ```console
-    kubectl create clusterrolebinding cluster-admin-binding \
-      --clusterrole cluster-admin \
-      --user $(gcloud config get-value account)
-    ```
+
+```console
+kubectl create clusterrolebinding cluster-admin-binding \
+--clusterrole cluster-admin \
+--user $(gcloud config get-value account)
+```
 
 The following **Mandatory Command** is required for all deployments except for AWS. See below for the AWS version.
 
@@ -60,6 +61,7 @@ For standard usage:
 ```console
 minikube addons enable ingress
 ```
+
 For development:
 
 1. Disable the ingress addon:
@@ -68,8 +70,8 @@ For development:
 minikube addons disable ingress
 ```
 
-2. Execute `make dev-env`
-3. Confirm the `nginx-ingress-controller` deployment exists:
+1. Execute `make dev-env`
+1. Confirm the `nginx-ingress-controller` deployment exists:
 
 ```console
 $ kubectl get pods -n ingress-nginx
@@ -115,9 +117,12 @@ This example creates an ELB with just two listeners, one in port 80 and another
 
 ##### ELB Idle Timeouts
 
-In some scenarios users will need to modify the value of the ELB idle timeout. Users need to ensure the idle timeout is less than the [keepalive_timeout](http://nginx.org/en/docs/http/ngx_http_core_module.html#keepalive_timeout) that is configured for NGINX. By default NGINX `keepalive_timeout` is set to `75s`.	
+In some scenarios users will need to modify the value of the ELB idle timeout.
+Users need to ensure the idle timeout is less than the [keepalive_timeout](http://nginx.org/en/docs/http/ngx_http_core_module.html#keepalive_timeout) that is configured for NGINX.
+By default NGINX `keepalive_timeout` is set to `75s`.
 
-The default ELB idle timeout will work for most scenarios, unless the NGINX [keepalive_timeout](http://nginx.org/en/docs/http/ngx_http_core_module.html#keepalive_timeout) has been modified, in which case `service.beta.kubernetes.io/aws-load-balancer-connection-idle-timeout` will need to be modified to ensure it is less than the `keepalive_timeout` the user has configured.	
+The default ELB idle timeout will work for most scenarios, unless the NGINX [keepalive_timeout](http://nginx.org/en/docs/http/ngx_http_core_module.html#keepalive_timeout) has been modified,
+in which case `service.beta.kubernetes.io/aws-load-balancer-connection-idle-timeout` will need to be modified to ensure it is less than the `keepalive_timeout` the user has configured.
 
 _Please Note: An idle timeout of `3600s` is recommended when using WebSockets._
 

roles/kubernetes-apps/metallb/README.md

@@ -4,7 +4,7 @@ MetalLB hooks into your Kubernetes cluster, and provides a network load-balancer
 In short, it allows you to create Kubernetes services of type "LoadBalancer" in clusters that
 don't run on a cloud provider, and thus cannot simply hook into paid products to provide load-balancers.
 This addon aims to automate [MetalLB in layer 2 mode](https://metallb.universe.tf/concepts/layer2/)
-or [MetalLB in BGP mode][https://metallb.universe.tf/concepts/bgp/].
+or [MetalLB in BGP mode](https://metallb.universe.tf/concepts/bgp/).
 It deploys MetalLB into Kubernetes and sets up a layer 2 or BGP load-balancer.
 
 ## Install

roles/kubernetes-apps/registry/README.md

@@ -24,7 +24,7 @@ whether the registry is run or not. To set this flag, you can specify
 does not include this flag, the following steps should work. Note that some of
 this is cloud-provider specific, so you may have to customize it a bit.
 
-### Make some storage
+- Make some storage
 
 The primary job of the registry is to store data. To do that we have to decide
 where to store it. For cloud environments that have networked storage, we can
@@ -58,7 +58,7 @@ If, for example, you wanted to use NFS you would just need to change the
 Note that in any case, the storage (in the case the GCE PersistentDisk) must be
 created independently - this is not something Kubernetes manages for you (yet).
 
-### I don't want or don't have persistent storage
+- I don't want or don't have persistent storage
 
 If you are running in a place that doesn't have networked storage, or if you
 just want to kick the tires on this without committing to it, you can easily
@@ -260,7 +260,7 @@ Now you can build and push images on your local computer as
 your kubernetes cluster with the same name.
 
 More Extensions
-===============
+---------------
 
 - [Use GCS as storage backend](gcs/README.md)
 - [Enable TLS/SSL](tls/README.md)