64 lines
2.4 KiB
YAML
64 lines
2.4 KiB
YAML
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# pg_auto_failover data node — joins the monitor and lets the
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# formation decide primary/secondary by election order. The first
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# node to register becomes primary; later nodes become secondaries.
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#
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# Sync replication is configured by the monitor itself based on
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# `number_sync_standbys` + `replication_quorum`, set on the formation
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# in monitor.yml's post-init step.
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---
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- name: Check whether the data node is already initialised
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ansible.builtin.stat:
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path: "{{ pg_auto_failover_state_dir }}/postgres/postgresql.conf"
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register: node_initialised
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- name: Initialise pg_auto_failover data node (joins the monitor)
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become: true
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become_user: postgres
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ansible.builtin.command:
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cmd: >
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/usr/lib/postgresql/{{ postgres_version }}/bin/pg_autoctl create postgres
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--pgdata {{ pg_auto_failover_state_dir }}/postgres
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--pgctl /usr/lib/postgresql/{{ postgres_version }}/bin/pg_ctl
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--pgport {{ pg_auto_failover_node_port }}
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--hostname {{ ansible_fqdn }}
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--monitor postgres://autoctl_node@{{ pg_auto_failover_monitor_host }}:{{ pg_auto_failover_monitor_port }}/{{ pg_auto_failover_monitor_dbname }}?sslmode=require
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--auth trust
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--ssl-self-signed
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--dbname {{ pg_auto_failover_app_dbname }}
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--username {{ pg_auto_failover_app_user }}
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--run-as-keeper
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args:
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creates: "{{ pg_auto_failover_state_dir }}/postgres/postgresql.conf"
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when: not node_initialised.stat.exists
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- name: Render systemd unit for pg_autoctl data node
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ansible.builtin.template:
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src: pg_autoctl-node.service.j2
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dest: /etc/systemd/system/pg_autoctl.service
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owner: root
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group: root
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mode: "0644"
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notify: Restart pg_autoctl
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- name: Enable + start pg_autoctl data node service
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ansible.builtin.systemd:
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name: pg_autoctl
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state: started
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enabled: true
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daemon_reload: true
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- name: Set formation sync replication policy (run from any data node, idempotent)
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become: true
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become_user: postgres
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ansible.builtin.command:
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cmd: >
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/usr/lib/postgresql/{{ postgres_version }}/bin/pg_autoctl set formation
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number-sync-standbys {{ pg_auto_failover_number_sync_standbys }}
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--pgdata {{ pg_auto_failover_state_dir }}/postgres
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changed_when: false
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failed_when: false
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# Only one node needs to push the policy — but the command is
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# idempotent on the monitor side, so running it from every node
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# keeps the role re-entrant without coordination.
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run_once: false
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