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skylab-ansible/roles/swarm/tasks/check.yaml

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---
- name: Check cluster swarm status
run_once: true
block:
- name: Fetch cluster server swarm info
delegate_to: "{{ item }}"
ansible.builtin.command:
cmd: !unsafe docker info --format '{{json .Swarm}}'
changed_when: false
register: _docker_cluster_swarm_state_raw
loop: "{{ groups.cluster }}"
- name: Process cluster server swarm info
vars:
_docker_cluster_swarm_state: {}
ansible.builtin.set_fact:
_docker_cluster_swarm_state: "{{ _docker_cluster_swarm_state | combine({item.item: (item.stdout | from_json)}) }}"
loop: "{{ _docker_cluster_swarm_state_raw.results }}"
loop_control:
label: "{{ item.item }}"
- name: Identify swarm managers
vars:
_docker_cluster_swarm_managers: []
when: item.value.LocalNodeState == 'active' and item.value.ControlAvailable
ansible.builtin.set_fact:
_docker_cluster_swarm_managers: "{{ _docker_cluster_swarm_managers + [item.key] }}"
loop: "{{ _docker_cluster_swarm_state | dict2items }}"
loop_control:
label: "{{ item.key }}"
- name: Check that swarm managers were discovered
ansible.builtin.assert:
that:
- _docker_cluster_swarm_managers
fail_msg: >-
ERROR: None of the member cluster servers ({{ groups.cluster | join(', ') }}) are joined to
a docker swarm or is a swarm manager. Please join at least one cluster server to a swarm and
promote it to swarm manager
success_msg: >-
Identified {{ _docker_cluster_swarm_managers | count }} swarm managers
({{ _docker_cluster_swarm_managers | join(', ') }})
- name: Determine swarm manager cluster IDs
vars:
_docker_cluster_swarm_manager_cluster_ids: []
ansible.builtin.set_fact:
_docker_cluster_swarm_manager_cluster_ids: "{{ _docker_cluster_swarm_manager_cluster_ids + [_docker_cluster_swarm_state[item].Cluster.ID] }}"
loop: "{{ _docker_cluster_swarm_managers }}"
- name: Check swarm managers are part of the same swarm
ansible.builtin.assert:
that:
- _docker_cluster_swarm_manager_cluster_ids | unique | count == 1
fail_msg: >-
ERROR: Swarm managers ({{ _docker_cluster_swarm_managers | join(', ') }}) appear to be
joined to different swarms
(IDs {{ _docker_cluster_swarm_manager_cluster_ids | join(', ') }})
success_msg: >-
Swarm managers are joined to swarm with ID
{{ _docker_cluster_swarm_manager_cluster_ids[0] }}
- name: Determine swarm manager to use for host configuration
ansible.builtin.set_fact:
_docker_swarm_manager: "{{ _docker_cluster_swarm_managers[0] }}"
- name: Determine whether host needs to be added to the swarm
ansible.builtin.set_fact:
_docker_swarm_needs_join: "{{ not _docker_cluster_swarm_state[inventory_hostname].Cluster.ID | default('') == _docker_cluster_swarm_manager_cluster_ids[0] }}"