Ansible Pilot

Create a PostgreSQL Database - Ansible module postgresql_db

How to automate the creation of a "testdb" database on PostgreSQL using Ansible Playbook and postgresql_db module.

June 8, 2022
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How to Create a PostgreSQL Database with Ansible?

I’m going to show you a live demo with some simple Ansible code. I’m Luca Berton and welcome to today’s episode of Ansible Pilot.

Ansible Create a PostgreSQL Database

Let’s talk about the Ansible module postgresql_db. The full name is community.postgresql.postgresql_db, which means that is part of the collection of modules “community.postgresql” maintained by the Ansible Community to interact with PostgreSQL. The collection is tested with ansible-core version 2.11+, prior versions such as 2.9 or 2.10 are not supported. The purpose of the module is to add or remove PostgreSQL databases from a remote host.

Parameters

Let me summarize the main parameters of the module postgresql_db. Ansible supposes that PostgreSQL is in the target node. The only required parameter is “name”, the name of the database to interact with. The parameter “state” specify the desired state or the operation for the selected database. The option “present” means that the database should be created and the option “absent” means that the database should be deleted. Other useful operations are “dump” and “restore” that uses pg_dump, the embedded PostgreSQL utility to backup and restore to the target file. Another useful operation is rename, from name to target. This module uses psycopg2, a Python PostgreSQL database library. You must ensure that python3-psycopg2 is installed on the host before using this module.

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demo

Let’s jump into a real-life Ansible Playbook to Create a PostgreSQL Database. I’m going to show you how to create the testdb database in the current PostgreSQL server.

code

---
- name: postgresql demo
  hosts: all
  become: true
  vars:
    db_name: testdb
  tasks:
    - name: Utility present
      ansible.builtin.package:
        name: python3-psycopg2
        state: present
    - name: Create db
      community.postgresql.postgresql_db:
        state: present
        name: "{{ db_name }}"
      become: true
      become_user: postgres

execution

$ ansible-playbook -i virtualmachines/demo/inventory postgresql/db_create.yml
PLAY [postgresql demo] ************************************************************************************
TASK [Gathering Facts] ************************************************************************************
ok: [demo.example.com]
TASK [utility present] ************************************************************************************
ok: [demo.example.com]
TASK [Create db] ******************************************************************************************
[WARNING]: Module remote_tmp /var/lib/pgsql/.ansible/tmp did not exist and was created with a mode of
0700, this may cause issues when running as another user. To avoid this, create the remote_tmp dir with
the correct permissions manually
changed: [demo.example.com]
PLAY RECAP ************************************************************************************************
demo.example.com           : ok=3    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

idempotency

$ ansible-playbook -i virtualmachines/demo/inventory postgresql/db_create.yml
PLAY [postgresql demo] ************************************************************************************
TASK [Gathering Facts] ************************************************************************************
ok: [demo.example.com]
TASK [utility present] ************************************************************************************
ok: [demo.example.com]
TASK [Create db] ******************************************************************************************
ok: [demo.example.com]
PLAY RECAP ************************************************************************************************
demo.example.com           : ok=3    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

before execution

$ ssh [email protected]
Last login: Wed Jun  8 15:09:44 2022 from 192.168.178.26
[[email protected] ~]$ sudo su
[[email protected] devops]# su - postgres
Last login: Wed Jun  8 15:07:05 UTC 2022 on pts/1
[[email protected] ~]$ psql testdb
psql: FATAL:  database "testdb" does not exist
[[email protected] ~]$

after execution

$ ssh [email protected]
Last login: Wed Jun  8 15:39:11 2022 from 192.168.178.26
[[email protected] ~]$ sudo su
[[email protected] devops]# su - postgres
Last login: Wed Jun  8 15:37:54 UTC 2022 on pts/0
[[email protected] ~]$ psql testdb
psql (10.21)
Type "help" for help.
testdb=# \q
[[email protected] ~]$

code with ❤️ in GitHub

Recap

Now you know how to Create a PostgreSQL Database with Ansible. Subscribe to the YouTube channel, Medium, Website, Twitter, and Substack to not miss the next episode of the Ansible Pilot.

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