ansible-role-k3s/tasks/validate/configuration/control-node-count.yml

---

- name: Check the conditions when a single controller is defined
  ansible.builtin.assert:
    that:
      - (k3s_controller_list | length == 1)
      - ("datastore-endpoint" not in k3s_runtime_config or not k3s_runtime_config['datastore-endpoint'])
      - (k3s_etcd_datastore is not defined or not k3s_etcd_datastore)
    success_msg: "Control plane configuration is valid."
    fail_msg: >-
      Control plane configuration is invalid.
      Please see notes about k3s_control_node and HA in README.md.
  when:
    - k3s_controller_list | length == 1
    - not k3s_use_unsupported_config
    - k3s_control_node

- name: Check the conditions when multiple controllers are defined
  ansible.builtin.assert:
    that:
      - (k3s_controller_list | length >= 2)
      - (("datastore-endpoint" in k3s_runtime_config and k3s_runtime_config['datastore-endpoint'])
          or (k3s_etcd_datastore is defined and k3s_etcd_datastore))
    success_msg: "Control plane configuration is valid."
    fail_msg: >-
      Control plane configuration is invalid. Please see notes about
      k3s_control_node and HA in README.md.
  when:
    - k3s_controller_list | length >= 2
    - k3s_control_node

- name: Check the conditions when embedded etcd is defined
  ansible.builtin.assert:
    that:
      - (k3s_controller_list | length >= 3)
      - (((k3s_controller_list | length) % 2) == 1)
    success_msg: "Control plane configuration is valid."
    fail_msg: >-
      Etcd should have a minimum of 3 defined members and the number of
      members should be odd. Please see notes about HA in README.md
  when:
    - k3s_etcd_datastore is defined
    - k3s_etcd_datastore
    - not k3s_use_unsupported_config
    - k3s_control_node
    - k3s_state != 'uninstalled'