Add the commands that start the replication.

tasks/postgresql-streaming-replication.yml

@@ -14,7 +14,7 @@
       name: '{{ item.name }}'
       value: "{{ item.value }}"
     loop: '{{ psql_streaming_replication_config }}'
-    #when: postgresql_streaming_replication_primary_node == '{{ ansible_fqdn }}'
+    when: postgresql_streaming_replication_primary_node == '{{ ansible_fqdn }}'
     notify: Restart postgresql
 
   become: True
@@ -23,7 +23,7 @@
 
 - name: Configure the streaming replication user on deb systems
   block:
-  - name: Configure the replication user permissions
+  - name: Configure the replication user permissions on deb
     postgresql_pg_hba:
       dest: '{{ psql_conf_dir }}/pg_hba.conf'
       contype: host
@@ -37,7 +37,7 @@
     notify: Reload postgresql
     when: not psql_enable_ssl
 
-  - name: Configure the replication user permissions
+  - name: Configure the replication user permissions on deb
     postgresql_pg_hba:
       dest: '{{ psql_conf_dir }}/pg_hba.conf'
       contype: hostssl
@@ -56,7 +56,7 @@
 
 - name: Configure the streaming replication user on EL
   block:
-  - name: Configure the replication user permissions
+  - name: Configure the replication user permissions on EL
     postgresql_pg_hba:
       dest: '{{ psql_el_conf_dir }}/pg_hba.conf'
       contype: host
@@ -70,7 +70,7 @@
     notify: Reload postgresql
     when: not psql_enable_ssl
 
-  - name: Configure the replication user permissions
+  - name: Configure the replication user permissions on EL
     postgresql_pg_hba:
       dest: '{{ psql_el_conf_dir }}/pg_hba.conf'
       contype: hostssl
@@ -86,3 +86,79 @@
 
   when: ansible_distribution_file_variety == "RedHat"
   tags: [ 'postgresql', 'postgres', 'pg_conf', 'pg_hba', 'postgresql_replication' ]
+
+- name: Manage the replica initialization
+  block:
+  - name: Set some paths when it is a deb based system
+    set_fact:
+      postgresql_user_home: '/var/lib/postgresql'
+      postgresql_active_data_dir: '{{ psql_data_dir }}'
+    when: ansible_distribution_file_variety == "Debian"
+
+  - name: Set some paths it is a EL based system
+    set_fact:
+      postgresql_user_home: '/var/lib/pgsql'
+      postgresql_active_data_dir: '{{ psql_el_data_dir }}'
+    when: ansible_distribution_file_variety == "RedHat"
+
+  - name: Create the .pgpass file inside the postgresql home {{ postgresql_user_home }}
+    become: True
+    become_user: postgres
+    copy:
+      content: "{{ postgresql_streaming_replication_primary_node }}:{{ psql_db_port }}:replication:{{ psql_streaming_replication_user }}:{{ psql_streaming_replication_pwd }}"
+      dest: '{{ postgresql_user_home }}.pgpass'
+      mode: '0400'
+
+  - name: Check if a replica is already enabled
+    stat:
+      path: '{{ postgresql_active_data_dir }}/.standby.signal'
+    register: standby_signal_file
+
+  - name: Stop the postgresql service on deb systems
+    service:
+      name: postgresql
+      state: stopped
+    when:
+      - ansible_distribution_file_variety == "Debian"
+      - not standby_signal_file.stat.exists
+
+  - name: Stop the postgresql service on EL systems
+    service:
+      name: 'postgresql-{{ psql_version }}'
+      state: stopped
+    when:
+      - ansible_distribution_file_variety == "RedHat"
+      - not standby_signal_file.stat.exists
+
+  - name: Remove the data directory contents {{ postgresql_active_data_dir }}
+    become: True
+    become_user: postgres
+    file:
+      dest: '{{ postgresql_active_data_dir }}'
+      state: absent
+    when: not standby_signal_file.stat.exists
+
+  - name: Run the pg_basebackup command that starts the replica
+    become: True
+    become_user: postgres
+    shell:  /usr/bin/pg_basebackup -h {{ postgresql_streaming_replication_primary_node }} -p {{ psql_db_port }} -U {{ psql_streaming_replication_user }} -D {{ postgresql_active_data_dir }} -Fp -R -Xs -P -w
+    when: not standby_signal_file.stat.exists
+
+  - name: Start the postgresql service
+    service:
+      name: postgresql
+      state: started
+    when:
+      - ansible_distribution_file_variety == "Debian"
+      - not standby_signal_file.stat.exists
+
+  - name: Start the postgresql service on EL systems
+    service:
+      name: 'postgresql-{{ psql_version }}'
+      state: started
+    when:
+      - ansible_distribution_file_variety == "RedHat"
+      - not standby_signal_file.stat.exists
+
+  when: postgresql_streaming_replication_primary_node != '{{ ansible_fqdn }}'
+  tags: [ 'postgresql', 'postgres', 'pg_conf', 'postgresql_replication' ]