freehck.k8s_join

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freehck.k8s_join

=========

Join nodes to Kubernetes cluster

Description

This role is used to add nodes to a Kubernetes cluster. The master host must have k8s_join_is_master set to true.

Role Variables

k8s_join_command_filename: File name for storing the authentication token/command, defaults to k8s-join-command.
k8s_join_is_master: A boolean flag that should only be true for one host in the cluster, specifically the master; defaults to false.

Example

Inventory

k8s-node-0 ansible_host=10.118.19.10 k8s_is_master=true
k8s-node-1 ansible_host=10.118.19.11
k8s-node-2 ansible_host=10.118.19.12

[k8s_cluster]
k8s-node-0
k8s-node-1
k8s-node-2

Playbook.yml

- hosts: k8s_cluster
  become: true
  vars:
    # common parameters
    k8s_ver: "1.16.2-00"
    k8s_node_ip: "{{ ansible_host }}"
    # k8s_base is an implicit dependency
    k8s_base_node_ip: "{{ k8s_node_ip }}"
    k8s_base_ver: "{{ k8s_ver }}"
    # k8s_init is an implicit dependency
    k8s_init_cidr: "192.168.0.0/16"
    k8s_init_node_ip: "{{ ansible_host }}"
    k8s_init_node_name: "{{ inventory_hostname }}"
    # this role configuration
    k8s_join_is_master: "{{ k8s_is_master | default('false') }}"
  roles:
    - role: freehck.k8s_base
    - role: freehck.k8s_init
      when: k8s_join_is_master
    - role: freehck.k8s_join

Notes

This role is meant to be used on both the master and worker nodes. On the master node, it generates an authentication token and saves it to a file on the Ansible controller. Remember not to commit this file, as it eventually expires! On the worker nodes, the token is used for them to join the cluster.