Provide alternative backup strategy using pg_dumpall(1)

Author: sj213

README.md

@@ -108,6 +108,16 @@ Role Variables
 
 - `postgresql_backup_post_command`: Arbitrary command to run after successful completion of a scheduled backup.
 
+### Backups via pg_dumpall(1) ###
+
+This is an alternative backup strategy that creates full dumps of the whole database cluster using pg_dumpall(1).
+
+- `postgresql_pgdump_dir`: If set, enables pg_dumpall(1)-backups. Set this to the directory where the dumps should be written. There is no distinction between local and archive directories; it is assumed that this directory is "safe enough" and has enough storage space available.
+
+- `postgresql_pgdump_cronspec`: This specifies the first 5 fields of the crontab-entry that will be govern the pgdump-schedule. Defaults to "00 18 * * 1-7", which means "start the dump each day at 18:00".
+
+- `postgresql_pgdump_filespec`: Controls the names of the dump files created. The default creates a file for each day of the week that will be overwritten after seven days.
+
 Dependencies
 ------------
 

defaults/main.yml

@@ -8,3 +8,7 @@ postgresql_backup_rotate: true
 postgresql_user_name: postgres
 
 postgresql_archive_wal_rsync_args: '--ignore-existing -ptg --info=skip1'
+
+postgresql_pgdump_cronspec: "00 18 * * 1-7"
+postgresql_pgdump_filespec: 'full.daily.`/bin/date +"\%u"`.sql'
+

tasks/main.yml

@@ -90,6 +90,9 @@
 - include_tasks: backup.yml
   when: postgresql_backup_dir is defined
 
+- include_tasks: pgdump.yml
+  when: postgresql_pgdump_dir is defined
+
 - name: Ensure PostgreSQL is running
   service:
     name: "{{ postgresql_service_name }}"

tasks/pgdump.yml

@@ -0,0 +1,18 @@
+---
+
+- name: Create backup directory for pgdump
+  file:
+    owner: postgres
+    group: postgres
+    mode: 0750
+    state: directory
+    path: "{{ postgresql_pgdump_dir }}"
+
+- name: Schedule pgdump backups via cron(8)
+  template:
+    src: local-pgdump.crontab
+    dest: /etc/cron.d/local-pgdump
+    owner: root
+    group: root
+    mode: 0644
+

templates/local-pgdump.crontab

@@ -0,0 +1 @@
+{{ postgresql_pgdump_cronspec }} {{ postgresql_user_name }} {{ postgresql_inst_dir_default }}/bin/pg_dumpall -c -f {{ postgresql_pgdump_dir }}/{{ postgresql_pgdump_filespec }}

vars/debian.yml

@@ -2,4 +2,5 @@
 
 postgresql_pgdata_default: /var/lib/postgresql/{{ postgresql_version }}/main
 postgresql_conf_dir_default: /etc/postgresql/{{ postgresql_version }}/main
+postgresql_inst_dir_default: /usr/lib/postgresql/{{ postgresql_version }}
 postgresql_service_name: postgresql

vars/redhat.yml

@@ -2,4 +2,5 @@
 
 postgresql_pgdata_default: /var/lib/pgsql/{{ postgresql_version }}/data
 postgresql_conf_dir_default: /var/lib/pgsql/{{ postgresql_version }}/data
+postgresql_inst_dir_default: /usr/pgsql-{{ postgresql_version }}
 postgresql_service_name: postgresql-{{ postgresql_version }}