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86 lines
2.5 KiB
86 lines
2.5 KiB
2 years ago
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# select a cluster node that can host a role
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- name: ensure there is at least one cluster node
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fail:
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msg: no cluster nodes are defined
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when: (groups['nodes'] | d([]) | length) == 0
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- name: clear selected_node
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set_fact:
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selected_node: ""
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- name: preference-based node determination
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block:
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- name: determine first cluster node which prefers to host role
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set_fact:
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selected_node: "{{ item }}"
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when:
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- hostvars[item] is defined
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- hostvars[item].can_host is defined
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- hostvars[item].can_host is iterable
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- hostvars[item].can_host is not mapping
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- hostvars[item].can_host is not string
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- hostvars[item].can_host[primary_role | d(inventory_hostname)] is defined
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- (hostvars[item].never_host is not defined) or
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(hostvars[item].never_host[primary_role | d(inventory_hostname)] is not defined)
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- not selected_node
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loop: "{{ groups['nodes'] }}"
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when: (hosted_on is not defined) and (inventory_hostname is defined)
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- name: pin-based node determination
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block:
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- name: fail if pinned node is not a string
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fail:
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msg: 'pinned node for "{{ inventory_hostname }}" must be a string'
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when: hosted_on is not string
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- name: fail if pinned node does not exist
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fail:
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msg: '"{{ inventory_hostname }}" has a nonexistent pinned node "{{ hosted_on }}"'
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when: hostvars[hosted_on] is not defined
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- name: select pinned cluster node
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set_fact:
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selected_node: "{{ hosted_on }}"
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when: (hosted_on is defined) and (inventory_hostname is defined)
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- name: fallback to first cluster node
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set_fact:
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selected_node: "{{ groups['nodes'][0] }}"
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when: not selected_node
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- name: determine actual node in a cluster configuration
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block:
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- set_fact:
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is_node_found: no
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- name: determine on which node this container is currently hosted on
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include_tasks: tasks/query_node.yml
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loop: "{{ groups['nodes'] }}"
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loop_control:
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loop_var: node
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when: groups['nodes'] | length >= 2
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rescue:
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- name: report that cluster cannot be queried
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debug:
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msg: 'cluster cannot be queried or all nodes are inaccessible, will keep cluster mode: "{{ selected_node }}"'
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- name: report which node was selected
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debug:
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msg: 'using cluster node: "{{ selected_node }}"'
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- name: ensure this node exists and can be connected to
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wait_for_connection:
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timeout: 10
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delegate_to: "{{ selected_node }}"
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