Ansible role for setting up pgbackrest

Installs and configures pgbackrest, PostgreSQL is assumed to already be installed.

Usage

Offical Ansible documentation.

TL;DR

Install manually

# If roles_path is set in ansible.cfg
ansible-galaxy install git+ssh://github.com/cosandr/ansible-role-pgbackrest.git
# If not, assuming you want to install to ./roles
ansible-galaxy install -p roles git+ssh://github.com/cosandr/ansible-role-pgbackrest.git

With requirements.yml

- src: https://github.com/cosandr/ansible-role-pgbackrest.git
  scm: git

# Same caveat about roles_path applies
ansible-galaxy install -r requirements.yml

Requirements

systemd is required.

PostgreSQL must already be installed and running. You must also add the following to postgresql.conf

archive_command = 'pgbackrest --stanza=<name> archive-push %p'
archive_mode = on
max_wal_senders = 3
wal_level = replica

On the standby server(s), you might want to include hot_standby = on as well.

If using Xait's postgres role, you can add the above config in the postgresql_extra_conf variable.

Role Variables

• pgbackrest_restore_standby set to true to restore from a standby from the stanza with recovery-option set.
• pgbackrest_local_postgresql set to false if pgbackrest host doesn't have PG installed locally.
• pgbackrest_services_install set to false to skip installing backup services/timers.
• pgbackrest_timer_enabled set to false if running on standby.
• pgbackrest_timer_random_delay defaults to 0, might be useful when backing up multiple repos simultaneously.
• pgbackrest_spool_path defaults to /var/spool/pgbackrest
• pgbackrest_async_archive set to true to enable asynchronous archiving.
• pgbackrest_async_archive_process_max sets the maximum number of parallel operations when async archive is enabled, defaults to 2.
• pgbackrest_conf_extra raw text that is added at the end of the config file.
• pgbackrest_global_config mapping of options that will be added to the [global] section, defaults to

pgbackrest_global_config:
  log-level-file: "info"
  log-level-console: "info"
  start-fast: "y"
  delta: "y"

• pgbackrest_stanzas defines stanzas and (optional) scheduled backups, example below

pgbackrest_stanzas:
  - name: backup
    pg_config:
      # Local pg server
      - path: "/var/lib/pgsql/{{ postgresql_version }}/data"
      # Remote (if using backup-standby=y)
      - path: "/var/lib/pgsql/{{ postgresql_version }}/data"
        host: "10.0.50.51"
        host-user: "postgres"
      - path: "/var/lib/pgsql/{{ postgresql_version }}/data"
        host: "10.0.50.52"
        host-user: "postgres"
    schedules:
      - backup_type: full
        oncalendar: 'Weekly'
    extra:
      backup-standby: "y"
    # On standby
  - name: repl
    pg_config:
      - path: "/var/lib/pgsql/{{ postgresql_version }}/data"
    extra:
      recovery-option: "primary_conninfo=host=10.0.50.11 user=replic_user port=5432"

• pgbackrest_repos list of repositories to configure (in global section)

Example with repo1 being Azure blob storage and repo2 replication from primary server:

pgbackrest_repos:
  # Backup to Azure Blob
  - path: "/atl-main"
    retention-full: "7"
    retention-diff: "3"
    type: azure
    azure-account: atlpgstorage
    azure-container: pgbackrest
    azure-key: somelongkeyhere
  - path: "/example"
    user: "postgres"
  # replication
  - host: "10.0.50.11"
    host-user: "postgres"

The above examples and default config result in /etc/pgbackrest.conf as follows:

[global]
repo1-path=/atl-main
repo1-retention-full=7
repo1-retention-diff=3
repo1-type=azure
repo1-azure-account=atlpgstorage
repo1-azure-container=pgbackrest
repo1-azure-key=somelongkeyhere
repo2-path=/example
repo2-user=postgres
repo3-host=10.0.50.11
repo3-host-user=postgres
log-level-file=debug
log-level-console=info
start-fast=y
delta=y

[backup]
pg1-path=/var/lib/pgsql/13/data
pg2-path=/var/lib/pgsql/13/data
pg2-host=10.0.50.51
pg2-host-user=postgres
pg3-path=/var/lib/pgsql/13/data
pg3-host=10.0.50.52
pg3-host-user=postgres
backup-standby=y

[repl]
pg1-path=/var/lib/pgsql/13/data
recovery-option=primary_conninfo=host=10.0.50.11 user=replic_user port=5432

Example Playbook

This example is for a single server backed up to Azure blobs

- hosts: servers
  vars:
    postgresql_version: 13
  roles:
    - role: xait_software_postgres
      vars:
        postgresql_extra_conf: |
          archive_command = 'pgbackrest --stanza=backup archive-push %p'
          archive_mode = on
          max_wal_senders = 3
          wal_level = replica
    - role: pgbackrest
      vars:
        pgbackrest_repos:
          - path: "/atl-main"
            retention-full: "7"
            retention-diff: "3"
            type: azure
            azure-account: atlpgstorage
            azure-container: pgbackrest
            azure-key: somelongkeyhere
        pgbackrest_stanzas:
          - name: backup
            pg_config:
              - path: "/var/lib/pgsql/{{ postgresql_version }}/data"
            schedules:
              - backup_type: full
                oncalendar: 'Weekly'

Author Information

Loosely based on dudefellah's role.

Andrei Costescu