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setup_pgbackrest

This role is for setting up pgBackRest backups on Postgres nodes.

Requirements

Following are the requirements of this role.

  1. Ansible
  2. edb_devops.edb_postgres -> setup_repo role for setting the repository on the systems.

Role Variables

When executing the role via ansible these are the required variables:

  • pg_version

Postgres Versions supported are: 13 and 14

  • pg_type

Database Engine supported are: PG and EPAS

These and other variables can be assigned in the pre_tasks definition of the section: How to include the setup_pgbackrest role in your Playbook

The rest of the variables can be configured and are available in the:

Below is the documentation of the rest of the main variables:

replication_user

Dedicated replication user used in WAL streaming replication. Default: repuser

Example:

replication_user: 'repuser'

pgbackrest_spool_directory

pgBackRest spool directory. Stores transient data during backup and recovery. Only used when pgbackrest_archive_method set to async. Default: /var/spool/pgbackrest

Example:

pgbackrest_spool_directory: '/var/spool/pgbackrest'

process_max_backup

Number of parallel processes used during backup. Not recommended to use more than 25% of available CPU. Only used when pgbackrest_archive_method is set to async. Default: 3

Example:

process_max_backup: 3

process_max_recovery

Number of parallel processes used during recovery. Set as high as possible to allow for fastest recovery time. Only used when pgbackrest_archive_method is set to async. Default: 3

Example:

process_max_recovery: 3

Host Variables

Below are the host variables defined in the inventory file, for each Postgres node we want to backup with pgBackRest.

pgbackrest

Enable pgBackRest backups for the host. Default: false

Example:

pgbackrest: true

pgbackrest_server_private_ip

pgBackRest server private IP address. Default: None

Example:

pgbackrest_server_private_ip: 10.0.0.123

pgbackrest_archive_method

Archive method. Can be:

  • standard for archiving WAL segments one at a time. When a WAL segment is pushed via the archive_command, the transfer must be completed before another WAL segment can be archived.
  • async for archiving WAL segments asychronously. WAL segments can be grouped together and transferred at the same time. Can improve archiving efficiency.

Default: async

Example:

pgbackrest_archive_method: async

Dependencies

This role does not have any dependencies, but package repositories should have been configured beforehand with the setup_repo role.

Example Playbook

Inventory file content

Content of the inventory.yml file:

---
all:
  children:
    pgbackrestserver:
      hosts:
        pgbackrest1:
          ansible_host: xxx.xxx.xxx.xxx
          private_ip: xxx.xxx.xxx.xxx
    primary:
      hosts:
        primary1:
          ansible_host: xxx.xxx.xxx.xxx
          private_ip: xxx.xxx.xxx.xxx
          # enable pgBackRest
          pgbackrest: true
          # Private IP address of the pgBackRest server
          pgbackrest_server_private_ip: xxx.xxx.xxx.xxx
          # WAL archiving method 
          pgbackrest_archive_method: async
    standby:
      hosts:
        standby1:
          ansible_host: xxx.xxx.xxx.xxx
          private_ip: xxx.xxx.xxx.xxx
          upstream_node_private_ip: xxx.xxx.xxx.xxx
          replication_type: synchronous
          # enable pgBackRest
          pgbackrest: true
          # Private IP address of the pgBackRest server
          pgbackrest_server_private_ip: xxx.xxx.xxx.xxx
          # WAL archiving method 
          pgbackrest_archive_method: async
        standby2:
          ansible_host: xxx.xxx.xxx.xxx
          private_ip: xxx.xxx.xxx.xxx
          upstream_node_private_ip: xxx.xxx.xxx.xxx
          replication_type: asynchronous
          # enable pgBackRest
          pgbackrest: true
          # Private IP address of the pgBackRest server
          pgbackrest_server_private_ip: xxx.xxx.xxx.xxx
          # WAL archiving method 
          pgbackrest_archive_method: async

How to include the setup_pgbackrest role in your Playbook

Below is an example of how to include the setup_pgbackrest role:

---
- hosts: primary, standby
  name: Configure pgBackRest backup on Postgres nodes
  become: yes
  gather_facts: yes

  collections: 
    - edb_devops.edb_postgres
    
  pre_tasks:
    - name: Initialize the user defined variables
      set_fact:
        pg_version: 14
        pg_type: "PG"
        
  roles:
    - setup_pgbackrest
      when: "'setup_pgbackrest' in lookup('edb_devops.edb_postgres.supported_roles', wantlist=True)"

Defining and adding variables is done in the set_fact of the pre_tasks.

All the variables are available at:

License

BSD

Author information

Author: