189 lines
9.2 KiB
Markdown
189 lines
9.2 KiB
Markdown
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Deploy a Production Ready Kubernetes Cluster
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============================================
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If you have questions, join us on the [kubernetes slack](https://kubernetes.slack.com), channel **\#kubespray**.
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You can get your invite [here](http://slack.k8s.io/)
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- Can be deployed on **AWS, GCE, Azure, OpenStack, vSphere, Oracle Cloud Infrastructure (Experimental), or Baremetal**
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- **Highly available** cluster
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- **Composable** (Choice of the network plugin for instance)
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- Supports most popular **Linux distributions**
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- **Continuous integration tests**
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Quick Start
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-----------
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To deploy the cluster you can use :
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### Ansible
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# Install dependencies from ``requirements.txt``
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sudo pip install -r requirements.txt
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# Copy ``inventory/sample`` as ``inventory/mycluster``
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cp -rfp inventory/sample/* inventory/mycluster
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# Update Ansible inventory file with inventory builder
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declare -a IPS=(10.10.1.3 10.10.1.4 10.10.1.5)
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CONFIG_FILE=inventory/mycluster/hosts.ini python3 contrib/inventory_builder/inventory.py ${IPS[@]}
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# Review and change parameters under ``inventory/mycluster/group_vars``
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cat inventory/mycluster/group_vars/all.yml
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cat inventory/mycluster/group_vars/k8s-cluster.yml
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# Deploy Kubespray with Ansible Playbook
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ansible-playbook -i inventory/mycluster/hosts.ini cluster.yml
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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).
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As a consequence, `ansible-playbook` command will fail with:
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```
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ERROR! no action detected in task. This often indicates a misspelled module name, or incorrect module path.
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```
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probably pointing on a task depending on a module present in requirements.txt (i.e. "unseal vault").
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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.
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A workaround consists of setting `ANSIBLE_LIBRARY` and `ANSIBLE_MODULE_UTILS` environment variables respectively to the `ansible/modules` and `ansible/module_utils` subdirectories of pip packages installation location, which can be found in the Location field of the output of `pip show [package]` before executing `ansible-playbook`.
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### Vagrant
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For Vagrant we need to install python dependencies for provisioning tasks.
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Check if Python and pip are installed:
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python -V && pip -V
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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/>
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Install the necessary requirements
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sudo pip install -r requirements.txt
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vagrant up
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Documents
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---------
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- [Requirements](#requirements)
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- [Kubespray vs ...](docs/comparisons.md)
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- [Getting started](docs/getting-started.md)
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- [Ansible inventory and tags](docs/ansible.md)
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- [Integration with existing ansible repo](docs/integration.md)
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- [Deployment data variables](docs/vars.md)
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- [DNS stack](docs/dns-stack.md)
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- [HA mode](docs/ha-mode.md)
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- [Network plugins](#network-plugins)
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- [Vagrant install](docs/vagrant.md)
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- [CoreOS bootstrap](docs/coreos.md)
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- [Debian Jessie setup](docs/debian.md)
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- [openSUSE setup](docs/opensuse.md)
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- [Downloaded artifacts](docs/downloads.md)
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- [Cloud providers](docs/cloud.md)
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- [OpenStack](docs/openstack.md)
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- [AWS](docs/aws.md)
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- [Azure](docs/azure.md)
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- [vSphere](docs/vsphere.md)
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- [Large deployments](docs/large-deployments.md)
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- [Upgrades basics](docs/upgrades.md)
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- [Roadmap](docs/roadmap.md)
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Supported Linux Distributions
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-----------------------------
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- **Container Linux by CoreOS**
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- **Debian** Jessie, Stretch, Wheezy
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- **Ubuntu** 16.04, 18.04
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- **CentOS/RHEL** 7
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- **Fedora** 28
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- **Fedora/CentOS** Atomic
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- **openSUSE** Leap 42.3/Tumbleweed
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Note: Upstart/SysV init based OS types are not supported.
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Supported Components
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--------------------
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- Core
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- [kubernetes](https://github.com/kubernetes/kubernetes) v1.11.3
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- [etcd](https://github.com/coreos/etcd) v3.2.18
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- [docker](https://www.docker.com/) v17.03 (see note)
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- [rkt](https://github.com/rkt/rkt) v1.21.0 (see Note 2)
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- [cri-o](http://cri-o.io/) v1.11.5 (see [CRI-O Note](docs/cri-o.md))
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- Network Plugin
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- [calico](https://github.com/projectcalico/calico) v3.1.3
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- [canal](https://github.com/projectcalico/canal) (given calico/flannel versions)
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- [cilium](https://github.com/cilium/cilium) v1.2.0
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- [contiv](https://github.com/contiv/install) v1.1.7
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- [flanneld](https://github.com/coreos/flannel) v0.10.0
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- [weave](https://github.com/weaveworks/weave) v2.4.1
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- Application
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- [cephfs-provisioner](https://github.com/kubernetes-incubator/external-storage) v2.1.0-k8s1.11
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- [cert-manager](https://github.com/jetstack/cert-manager) v0.5.0
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- [coredns](https://github.com/coredns/coredns) v1.2.2
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- [ingress-nginx](https://github.com/kubernetes/ingress-nginx) v0.19.0
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Note: kubernetes doesn't support newer docker versions ("Version 17.03 is recommended... Versions 17.06+ might work, but have not yet been tested and verified by the Kubernetes node team" cf. [Bootstrapping Clusters with kubeadm](https://kubernetes.io/docs/setup/independent/install-kubeadm/#installing-docker)). Among other things kubelet currently breaks 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).
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Note 2: rkt support as docker alternative is limited to control plane (etcd and
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kubelet). Docker is still used for Kubernetes cluster workloads and network
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plugins' related OS services. Also note, only one of the supported network
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plugins can be deployed for a given single cluster.
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Requirements
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------------
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- **Ansible v2.4 (or newer) and python-netaddr is installed on the machine
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that will run Ansible commands**
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- **Jinja 2.9 (or newer) is required to run the Ansible Playbooks**
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- The target servers must have **access to the Internet** in order to pull docker images.
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- The target servers are configured to allow **IPv4 forwarding**.
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- **Your ssh key must be copied** to all the servers part of your inventory.
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- The **firewalls are not managed**, you'll need to implement your own rules the way you used to.
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in order to avoid any issue during deployment you should disable your firewall.
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- If kubespray is ran from non-root user account, correct privilege escalation method
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should be configured in the target servers. Then the `ansible_become` flag
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or command parameters `--become or -b` should be specified.
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Network Plugins
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---------------
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You can choose between 6 network plugins. (default: `calico`, except Vagrant uses `flannel`)
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- [flannel](docs/flannel.md): gre/vxlan (layer 2) networking.
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- [calico](docs/calico.md): bgp (layer 3) networking.
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- [canal](https://github.com/projectcalico/canal): a composition of calico and flannel plugins.
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- [cilium](http://docs.cilium.io/en/latest/): layer 3/4 networking (as well as layer 7 to protect and secure application protocols), supports dynamic insertion of BPF bytecode into the Linux kernel to implement security services, networking and visibility logic.
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- [contiv](docs/contiv.md): supports vlan, vxlan, bgp and Cisco SDN networking. This plugin is able to
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apply firewall policies, segregate containers in multiple network and bridging pods onto physical networks.
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- [weave](docs/weave.md): Weave is a lightweight container overlay network that doesn't require an external K/V database cluster.
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(Please refer to `weave` [troubleshooting documentation](http://docs.weave.works/weave/latest_release/troubleshooting.html)).
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The choice is defined with the variable `kube_network_plugin`. There is also an
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option to leverage built-in cloud provider networking instead.
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See also [Network checker](docs/netcheck.md).
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Community docs and resources
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----------------------------
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- [kubernetes.io/docs/getting-started-guides/kubespray/](https://kubernetes.io/docs/getting-started-guides/kubespray/)
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- [kubespray, monitoring and logging](https://github.com/gregbkr/kubernetes-kargo-logging-monitoring) by @gregbkr
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- [Deploy Kubernetes w/ Ansible & Terraform](https://rsmitty.github.io/Terraform-Ansible-Kubernetes/) by @rsmitty
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- [Deploy a Kubernetes Cluster with Kubespray (video)](https://www.youtube.com/watch?v=N9q51JgbWu8)
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Tools and projects on top of Kubespray
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--------------------------------------
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- [Digital Rebar Provision](https://github.com/digitalrebar/provision/blob/master/doc/integrations/ansible.rst)
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- [Fuel-ccp-installer](https://github.com/openstack/fuel-ccp-installer)
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- [Terraform Contrib](https://github.com/kubernetes-incubator/kubespray/tree/master/contrib/terraform)
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CI Tests
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--------
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[](https://gitlab.com/kubespray-ci/kubernetes-incubator__kubespray/pipelines)
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CI/end-to-end tests sponsored by Google (GCE)
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See the [test matrix](docs/test_cases.md) for details.
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