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update_pgcluster.yml
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update_pgcluster.yml
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---
- name: update_pgcluster.yml | Update PostgreSQL HA Cluster (based on "Patroni")
hosts: postgres_cluster
gather_facts: true
become: true
become_method: sudo
any_errors_fatal: true
pre_tasks:
- name: Include main variables
ansible.builtin.include_vars: "vars/main.yml"
tags: always
tasks:
- name: "[Prepare] Get Patroni Cluster Leader Node"
ansible.builtin.uri:
url: http://{{ inventory_hostname }}:{{ patroni_restapi_port }}/leader
status_code: 200
register: patroni_leader_result
changed_when: false
failed_when: false
environment:
no_proxy: "{{ inventory_hostname }}"
tags: always
- name: '[Prepare] Add host to group "primary" (in-memory inventory)'
ansible.builtin.add_host:
name: "{{ item }}"
groups: primary
when: hostvars[item]['patroni_leader_result']['status'] == 200
loop: "{{ groups['postgres_cluster'] }}"
changed_when: false
tags: always
- name: '[Prepare] Add hosts to group "secondary" (in-memory inventory)'
ansible.builtin.add_host:
name: "{{ item }}"
groups: secondary
when: hostvars[item]['patroni_leader_result']['status'] != 200
loop: "{{ groups['postgres_cluster'] }}"
changed_when: false
tags: always
- name: "Print Patroni Cluster info"
ansible.builtin.debug:
msg:
- "Cluster Name: {{ patroni_cluster_name }}"
- "Cluster Leader: {{ ansible_hostname }}"
when: inventory_hostname in groups['primary']
tags: always
- name: "(1/4) PRE-UPDATE: Perform Pre-Checks"
hosts: "primary:secondary"
gather_facts: false
become: true
become_user: postgres
any_errors_fatal: true
vars:
max_replication_lag_bytes: 10485760 # 10 MiB
max_transaction_sec: 15 # seconds
pre_tasks:
- name: Include main variables
ansible.builtin.include_vars: "vars/main.yml"
tasks:
- name: Running Pre-Checks
ansible.builtin.include_role:
name: update
tasks_from: pre_checks
tags:
- update
- pre-checks
- name: "(2/4) UPDATE: Secondary"
hosts: secondary
serial: 1 # update replicas one by one
gather_facts: false
become: true
become_method: sudo
any_errors_fatal: true
environment: "{{ proxy_env | default({}) }}"
vars:
target: postgres # or 'patroni', 'system'
pre_tasks:
- name: Include main variables
ansible.builtin.include_vars: "vars/main.yml"
- name: Include OS-specific variables
ansible.builtin.include_vars: "vars/{{ ansible_os_family }}.yml"
tasks:
- name: Stop read-only traffic
ansible.builtin.include_role:
name: update
tasks_from: stop_traffic
- name: Stop Services
ansible.builtin.include_role:
name: update
tasks_from: stop_services
- name: Update PostgreSQL
ansible.builtin.include_role:
name: update
tasks_from: postgres
when: target | lower == 'postgres'
- name: Update Patroni
ansible.builtin.include_role:
name: update
tasks_from: patroni
when: target | lower == 'patroni' or
(target | lower == 'system' and patroni_installation_method == "pip")
- name: Update all system packages (includes PostgreSQL and Patroni)
ansible.builtin.include_role:
name: update
tasks_from: system
when: target | lower == 'system'
- name: Start Services
ansible.builtin.include_role:
name: update
tasks_from: start_services
- name: Start read-only traffic
ansible.builtin.include_role:
name: update
tasks_from: start_traffic
tags:
- update
- update-secondary
- name: "(3/4) UPDATE: Primary"
hosts: primary
gather_facts: false
become: true
become_method: sudo
any_errors_fatal: true
environment: "{{ proxy_env | default({}) }}"
vars:
target: postgres # or 'patroni', 'system'
pre_tasks:
- name: Include main variables
ansible.builtin.include_vars: "vars/main.yml"
- name: Include OS-specific variables
ansible.builtin.include_vars: "vars/{{ ansible_os_family }}.yml"
tasks:
- name: "Switchover Patroni leader role"
ansible.builtin.include_role:
name: update
tasks_from: switchover
- name: Stop read-only traffic
ansible.builtin.include_role:
name: update
tasks_from: stop_traffic
- name: Stop Services
ansible.builtin.include_role:
name: update
tasks_from: stop_services
- name: Update PostgreSQL
ansible.builtin.include_role:
name: update
tasks_from: postgres
when: target | lower == 'postgres'
- name: Update Patroni
ansible.builtin.include_role:
name: update
tasks_from: patroni
when: target | lower == 'patroni' or
(target | lower == 'system' and patroni_installation_method == "pip")
- name: Update all system packages (includes PostgreSQL and Patroni)
ansible.builtin.include_role:
name: update
tasks_from: system
when: target | lower == 'system'
- name: Start Services
ansible.builtin.include_role:
name: update
tasks_from: start_services
- name: Start read-only traffic
ansible.builtin.include_role:
name: update
tasks_from: start_traffic
tags:
- update
- update-primary
- name: "(4/4) POST-UPDATE: Update extensions"
hosts: postgres_cluster
gather_facts: false
become: true
become_user: postgres
any_errors_fatal: true
vars:
update_extensions: true # or 'false', to avoid updating extensions
pre_tasks:
- name: Include main variables
ansible.builtin.include_vars: "vars/main.yml"
tasks:
- name: Update extensions
ansible.builtin.include_role:
name: update
tasks_from: extensions
when: update_extensions | bool
# finish (info)
- name: Check the Patroni cluster state
run_once: true # noqa run-once
become: true
become_user: postgres
ansible.builtin.command: patronictl -c /etc/patroni/patroni.yml list
register: patronictl_result
changed_when: false
environment:
PATH: "{{ ansible_env.PATH }}:/usr/bin:/usr/local/bin"
- name: Check the current PostgreSQL version
run_once: true # noqa run-once
ansible.builtin.command: >-
psql -p {{ postgresql_port }} -U {{ patroni_superuser_username }} -d postgres -tAXc
"select current_setting('server_version')"
register: postgres_version
changed_when: false
- name: List the Patroni cluster members
run_once: true # noqa run-once
ansible.builtin.debug:
msg: "{{ patronictl_result.stdout_lines }}"
when: patronictl_result.stdout_lines is defined
- name: Update completed
run_once: true # noqa run-once
ansible.builtin.debug:
msg:
- "PostgreSQL HA cluster update completed."
- "Current version: {{ postgres_version.stdout }}"
when: postgres_version.stdout is defined
tags:
- update
- update-extensions