add db_dump backup timer

Signed-off-by: Jakub Sokołowski <jakub@status.im>

defaults/main.yml

@@ -5,6 +5,7 @@ postgres_ha_compose_file: '{{ postgres_ha_service_path }}/docker-compose.yml'
 
 postgres_ha_cont_name: '{{ postgres_ha_service_name }}'
 postgres_ha_cont_data_vol: '{{ postgres_ha_service_path }}/data'
+postgres_ha_cont_backup_vol: '{{ postgres_ha_service_path }}/backup'
 postgres_ha_cont_image: 'postgres:15.1-alpine'
 postgres_ha_cont_port: 5432
 postgres_ha_cont_uid: 70
@@ -35,6 +36,12 @@ postgres_ha_databases: []
 #    user: 'dbuser'
 #    pass: 'dbpass'
 
+# Backups
+postgres_ha_backup_service_name: 'dump-{{ telemetry_service_name }}-db'
+postgres_ha_backup_frequency: daily
+postgres_ha_backup_timeout: 600
+postgres_ha_backup_user: 'root'
+
 # Consul
 postgres_ha_consul_service: 'postgres'
 

tasks/backup.yml

@@ -0,0 +1,19 @@
+---
+- name: 'Create timer for database backup'
+  include_role: name=systemd-timer
+  vars:
+    systemd_timer_name: '{{ postgres_ha_backup_service_name }}'
+    systemd_timer_description: 'Dump Telemetry PostgreSQL database.'
+    systemd_timer_user: '{{ postgres_ha_backup_user }}'
+    systemd_timer_frequency: '{{ postgres_ha_backup_frequency }}'
+    systemd_timer_timeout_sec: '{{ postgres_ha_backup_timeout }}'
+    systemd_timer_after_extra: 'docker.service'
+    systemd_timer_start_on_creation: false
+    systemd_timer_script_content: |
+      #!/usr/bin/env bash
+      BKP_DIR="{{ postgres_ha_cont_vol }}/backup/{{ postgres_ha_db_name }}"
+      rm -vfr "${BKP_DIR}"
+      /usr/bin/docker exec -i {{ postgres_ha_cont_name }} \
+        pg_dump -F directory -f "/backup/{{ postgres_ha_db_name }}" \
+        -U {{ postgres_ha_admin_user }} {{ postgres_ha_db_name }}
+      chmod 750 -R "${BKP_DIR}"

tasks/main.yml

@@ -22,3 +22,4 @@
     loop_var: db
 
 - import_tasks: consul.yml
+- import_tasks: backup.yml

templates/docker-compose.yml.j2

@@ -21,6 +21,7 @@ services:
       - '/tmp:size={{ postgres_ha_cont_tmp_size }}'
     volumes:
       - '{{ postgres_ha_cont_data_vol }}:/var/lib/postgresql/data'
+      - '{{ postgres_ha_cont_backup_vol }}/backup:/backup'
     command: |
       -p {{ postgres_ha_cont_port }}
     healthcheck: