ansible/roles/k3s_server/tasks/installation.yml

---
- name: See if k3s file exists
  ansible.builtin.stat:
    path: /usr/local/bin/k3s
  register: k3s_status

- name: Download K3s install script to /tmp/
  when: not k3s_status.stat.exists
  ansible.builtin.get_url:
    url: https://get.k3s.io
    dest: /tmp/k3s_install.sh
    mode: "0755"

- name: Install K3s server with node taint and TLS SAN
  when: (host.ip == k3s.server.ips[0] and (not k3s_status.stat.exists))
  ansible.builtin.command: |
    /tmp/k3s_install.sh server \
    --node-taint CriticalAddonsOnly=true:NoExecute \
    --tls-san {{ k3s.loadbalancer.ip }}
  environment:
    K3S_DATASTORE_ENDPOINT: "{{ k3s_db_connection_string }}"
  become: true
  async: 300
  poll: 0
  register: k3s_primary_install

- name: Wait for K3s to be installed
  when: (host.ip == k3s.server.ips[0] and (not k3s_status.stat.exists))
  ansible.builtin.async_status:
    jid: "{{ k3s_primary_install.ansible_job_id }}"
  register: k3s_primary_install_status
  until: k3s_primary_install_status.finished
  retries: 60
  delay: 5
  become: true

- name: Get K3s token from the first server
  when: host.ip == k3s.server.ips[0]
  ansible.builtin.slurp:
    src: /var/lib/rancher/k3s/server/node-token
  register: k3s_token
  become: true

- name: Set fact on k3s.server.ips[0]
  when: host.ip == k3s.server.ips[0]
  ansible.builtin.set_fact:
    k3s_token: "{{ k3s_token['content'] | b64decode | trim }}"

- name: Install K3s on the secondary servers
  when: (host.ip != k3s.server.ips[0] and (not k3s_status.stat.exists))
  ansible.builtin.command: |
    /tmp/k3s_install.sh server \
    --node-taint CriticalAddonsOnly=true:NoExecute \
    --tls-san {{ k3s.loadbalancer.ip }}
  environment:
    K3S_DATASTORE_ENDPOINT: "{{ k3s_db_connection_string }}"
    K3S_TOKEN: "{{ hostvars[(hostvars | dict2items | map(attribute='value') | map('dict2items') | map('selectattr', 'key', 'match', 'host') | map('selectattr', 'value.ip', 'match', k3s.server.ips[0] ) | select() | first | items2dict).host.hostname].k3s_token }}"
  become: true