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117 lines
3.4 KiB
Markdown
117 lines
3.4 KiB
Markdown
# Ansible Role: Kubernetes
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[](https://travis-ci.org/geerlingguy/ansible-role-kubernetes)
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An Ansible Role that installs [Kubernetes](https://kubernetes.io) on Linux.
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## Requirements
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Requires Docker; recommended role for Docker installation: `geerlingguy.docker`.
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## Role Variables
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Available variables are listed below, along with default values (see `defaults/main.yml`):
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kubernetes_packages:
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- name: kubelet
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state: present
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- name: kubeadm
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state: present
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- name: kubernetes-cni
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state: present
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Kubernetes packages to be installed on the server. You can either provide a list of package names, or set `name` and `state` to have more control over whether the package is `present`, `absent`, `latest`, etc.
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kubernetes_role: master
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Whether the particular server will serve as a Kubernetes `master` (default) or `node`. The master will have `kubeadm init` run on it to intialize the entire K8s control plane, while `node`s will have `kubeadm join` run on them to join them to the `master`.
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kubernetes_kubelet_extra_args: ""
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Extra args to pass to `kubelet` during startup. E.g. to allow `kubelet` to start up even if there is swap is enabled on your server, set this to: `"--fail-swap-on=false"`.
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kubernetes_allow_pods_on_master: True
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Whether to remove the taint that denies pods from being deployed to the Kubernetes master. If you have a single-node cluster, this should definitely be `True`. Otherwise, set to `False` if you want a dedicated Kubernetes master which doesn't run any other pods.
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kubernetes_enable_web_ui: False
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Whether to enable the Kubernetes web dashboard UI (only accessible on the master itself, or proxied).
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kuberenetes_debug: False
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Whether to show extra debug info in Ansible's logs (e.g. the output of the `kubeadm init` command).
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kubernetes_pod_network_cidr: '10.0.1.0/16'
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kubernetes_apiserver_advertise_address: ''
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kubernetes_version: 'stable-1.10'
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kubernetes_ignore_preflight_errors: 'all'
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Options passed to `kubeadm init` when initializing the Kubernetes master. The `apiserver_advertise_address` defaults to `ansible_default_ipv4.address` if it's left empty.
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kubernetes_apt_release_channel: main
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kubernetes_apt_repository: "deb http://apt.kubernetes.io/ kubernetes-xenial {{ kubernetes_apt_release_channel }}"
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kubernetes_apt_ignore_key_error: False
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Apt repository options for Kubernetes installation.
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kubernetes_yum_arch: x86_64
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Yum repository options for Kubernetes installation.
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## Dependencies
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None.
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## Example Playbooks
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### Single node (master-only) cluster
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```yaml
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- hosts: all
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vars:
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kubernetes_allow_pods_on_master: True
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roles:
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- geerlingguy.docker
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- geerlingguy.kubernetes
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```
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### Two or more nodes (single master) cluster
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Master inventory vars:
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```yaml
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kubernetes_role: "master"
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```
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Node(s) inventory vars:
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```yaml
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kubernetes_role: "node"
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```
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Playbook:
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```yaml
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- hosts: all
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vars:
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kubernetes_allow_pods_on_master: True
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roles:
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- geerlingguy.docker
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- geerlingguy.kubernetes
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```
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Then, log into the Kubernetes master, and run `kubectl get nodes` as root, and you should see a list of all the servers.
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## License
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MIT / BSD
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## Author Information
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This role was created in 2018 by [Jeff Geerling](https://www.jeffgeerling.com/), author of [Ansible for DevOps](https://www.ansiblefordevops.com/).
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