pvc-ansible/roles/pvc/tasks/patroni.yml

---
- name: install patroni packages via apt
  apt:
    name:
      - python-psycopg2
      - python3-kazoo
      - patroni
      - postgresql-11
    state: latest
    update-cache: yes

- name: first run check
  shell: "echo 'bootstrapped' > /etc/postgresql/pvc"
  register: newinstance
  args:
    creates: /etc/postgresql/pvc

- name: stop and disable postgresql
  service:
    name: "{{ item }}"
    state: stopped
    enabled: no
  with_items:
    - postgresql
    - postgresql@11-main
  when: newinstance.changed

- name: remove obsolete database directories
  file:
    dest: "{{ item }}"
    state: absent
  with_items:
    - /etc/postgresql/11
    - /var/lib/postgresql/11
  when: newinstance.changed

- name: create patroni database directory
  file:
    dest: /var/lib/postgresql/patroni/pvc
    state: directory
    owner: postgres
    mode: 0700
  when: newinstance.changed

- name: install postgresql customization configuration file
  template:
    src: patroni/postgresql.pvc.conf.j2
    dest: /etc/postgresql/postgresql.pvc.conf
    owner: postgres
    group: sudo
    mode: 0640
  notify: restart patroni

- name: install patroni configuration file
  template:
    src: patroni/patroni.yml.j2
    dest: /etc/patroni/config.yml
    owner: postgres
    group: postgres
    mode: 0640
  notify: restart patroni

- name: install check_mk agent check
  copy:
    src: patroni/postgres
    dest: /usr/lib/check_mk_agent/plugins/postgres
    mode: 0755

- name: ensure patroni services are enabled and started
  service:
    name: "{{ item }}.service"
    state: started
    enabled: yes
  with_items:
    - patroni

- name: install initial schema files
  copy:
    src: "{{ item.src }}"
    dest: "{{ item.dest }}"
    owner: postgres
    group: sudo
    mode: 0640
  with_items:
    - { src: "patroni/powerdns-schema.sql", dest: "/etc/postgresql/powerdns-schema.sql" }

- name: set up PVC DNS database on first host
  block:
    - name: wait 15s for cluster to initialize
      pause:
        seconds: 15

    - name: create user for role
      postgresql_user:
        name: "{{ pvc_dns_database_user }}"
        password: "{{ pvc_dns_database_password }}"
        state: present
        login_host: /run/postgresql
  
    - name: create database for role
      postgresql_db:
        name: "{{ pvc_dns_database_name }}"
        owner: "{{ pvc_dns_database_user }}"
        encoding: utf8
        state: present
        login_host: /run/postgresql
  
    - name: set user privs for role
      postgresql_user:
        name: "{{ pvc_dns_database_user }}"
        db: "{{ pvc_dns_database_name }}"
        priv: ALL
        login_host: /run/postgresql
  
    - name: create extensions
      postgresql_ext:
        name: "{{ item }}"
        db: "{{ pvc_dns_database_name }}"
        login_host: /run/postgresql
      with_items: "{{ extensions }}"
      when: extensions is defined

    - name: import dns database schema
      command: "psql -U {{ pvc_dns_database_user }} -f /etc/postgresql/powerdns-schema.sql {{ pvc_dns_database_name }}"

  become: yes
  become_user: postgres
  when: newinstance.changed and ansible_local.host_id == '1'