path: root/tasks/postgres-cluster.yml

---
- set_fact:
    postgres_version: "{{ postgres_cluster.version }}"
    postgres_cluster_name: "{{ postgres_cluster.name }}"
    postgres_port: "{{ postgres_cluster.port }}"
    postgres_fsync_enabled: "{{ postgres_cluster.fsync_enabled }}"
    postgres_archive_enabled: "{{ postgres_cluster.archive_enabled }}"
    postgres_wal_level: "{{ postgres_cluster.wal_level|default('logical') }}"
    postgres_max_replication_slots: "{{ postgres_cluster.max_replication_slots | default(10) }}"
    postgres_extra_config: "{{ postgres_cluster.extra_config | default({}) }}"
    barman_directory: "{{ postgres_cluster.barman_directory | default(None) }}"
    postgres_primary: "{{ postgres_cluster.primary | default(None) }}"
    postgres_checksums: "{{ postgres_cluster.checksums | default(True) }}"

- name: Install postgresql version {{ postgres_version }}
  apt: name=postgresql-{{ postgres_version }}
  when: ansible_distribution_release != 'NA'

- name: Install pg_repack version {{ postgres_version }}
  apt: name=postgresql-{{ postgres_version }}-repack
  when:
   - ansible_distribution_release != 'NA'
   - postgres_version in ['9.3', '9.4', '9.5', '9.6', '10', '11', '12']

- name: Set initdb options
  set_fact: postgres_initdb_option="{% if postgres_checksums %}--data-checksums{% endif %}"

- name: Create postgres cluster {{ postgres_version }}/{{ postgres_cluster_name }} if needed
  command: /usr/bin/pg_createcluster {{ postgres_version }} {{ postgres_cluster_name }} -- {{ postgres_initdb_option }}
  args:
    creates: /var/lib/postgresql/{{ postgres_version }}/{{ postgres_cluster_name }}/

- name: Check postgres server key
  stat: path=/var/lib/postgresql/{{ postgres_version }}/{{ postgres_cluster_name }}/server.key
  register: server_key

- name: Copy snakeoil key in postgres dir
  copy:
    src=/etc/ssl/private/ssl-cert-snakeoil.key
    dest=/var/lib/postgresql/{{ postgres_version }}/{{ postgres_cluster_name }}/server.key
    remote_src=true
    owner=postgres
    group=postgres
    mode="0600"
  when: not server_key.stat.exists or server_key.stat.islnk

- name: Check postgres server certificate
  stat: path=/var/lib/postgresql/{{ postgres_version }}/{{ postgres_cluster_name }}/server.crt
  register: server_crt

- name: Copy snakeoil certificate in postgres dir
  copy:
    src=/etc/ssl/certs/ssl-cert-snakeoil.pem
    dest=/var/lib/postgresql/{{ postgres_version }}/{{ postgres_cluster_name }}/server.crt
    remote_src=true
    owner=postgres
    group=postgres
    mode="0644"
  when: not server_crt.stat.exists or server_crt.stat.islnk

- name: Add standby clone from barman script
  include: postgres-standby-barman.yml
  when: postgres_barman_server is defined and postgres_primary.restore_barman_directory is defined

- name: Add standby clone from pg_basebackup
  include: postgres-standby-basebackup.yml
  when: postgres_primary and postgres_primary.pg_basebackup is defined

- name: Determine SSD or rotational disks
  raw: 'lsblk --noheadings --nodeps --raw --output=rota | grep -q 1'
  check_mode: no
  ignore_errors: yes
  register: rotational_disk

- name: Set specific random page cost for SSDs
  set_fact:
    postgres_specific_random_page_cost: "1.0"
  when:
    - rotational_disk.failed is defined
    - rotational_disk.failed

- name: Upload postgresql.conf
  template: src=postgresql.{{ postgres_version }}.conf.j2 dest=/etc/postgresql/{{ postgres_version }}/{{ postgres_cluster_name }}/postgresql.conf

- name: Upload pg_hba.conf
  template: src=pg_hba.conf.j2 dest=/etc/postgresql/{{ postgres_version }}/{{ postgres_cluster_name }}/pg_hba.conf

- name: Upload recovery.conf
  template: src=recovery.conf.j2 dest=/var/lib/postgresql/{{ postgres_version }}/{{ postgres_cluster_name }}/recovery.conf owner=postgres group=postgres mode=0600
  when: postgres_primary and postgres_version is version('12', '<')
  no_log: True

- name: Define secondary nodes as secondaries with corresponding signal files
  file:
    path: "{{ item }}"
    state: touch
  when: postgres_primary and postgres_version is version('12', '>=')
  with_items:
    - /var/lib/postgresql/{{ postgres_version }}/{{ postgres_cluster_name }}/standby.signal

- name: Create log file
  file:
    path={{ postgres_log_dir }}/postgresql-{{ postgres_version }}-{{ postgres_cluster_name }}.log
    state=touch
    owner=postgres
    group=adm
  when: postgres_log_dir is defined and postgres_log_dir

- name: Create log symlink for pg_lsclusters
  file: dest=/etc/postgresql/{{ postgres_version }}/{{ postgres_cluster_name }}/log src={{ postgres_log_dir }}/postgresql-{{ postgres_version }}-{{ postgres_cluster_name }}.log state=link
  when: postgres_log_dir is defined and postgres_log_dir