community.postgresql.postgresql_ping module – Check remote PostgreSQL server availability

Note

This module is part of the community.postgresql collection (version 2.2.0).

You might already have this collection installed if you are using the ansible package. It is not included in ansible-core. To check whether it is installed, run ansible-galaxy collection list.

To install it, use: ansible-galaxy collection install community.postgresql.

To use it in a playbook, specify: community.postgresql.postgresql_ping.

Synopsis

  • Simple module to check remote PostgreSQL server availability.

Requirements

The below requirements are needed on the host that executes this module.

  • psycopg2

Parameters

Parameter

Comments

ca_cert

aliases: ssl_rootcert

string

Specifies the name of a file containing SSL certificate authority (CA) certificate(s).

If the file exists, the server’s certificate will be verified to be signed by one of these authorities.

db

aliases: login_db

string

Name of a database to connect to.

login_host

string

Host running the database.

If you have connection issues when using localhost, try to use 127.0.0.1 instead.

login_password

string

The password this module should use to establish its PostgreSQL session.

login_unix_socket

string

Path to a Unix domain socket for local connections.

login_user

string

The username this module should use to establish its PostgreSQL session.

Default: “postgres”

port

aliases: login_port

integer

Database port to connect to.

Default: 5432

session_role

string

added in 0.2.0 of community.postgresql

Switch to session_role after connecting. The specified session_role must be a role that the current login_user is a member of.

Permissions checking for SQL commands is carried out as though the session_role were the one that had logged in originally.

ssl_mode

string

Determines whether or with what priority a secure SSL TCP/IP connection will be negotiated with the server.

See https://www.postgresql.org/docs/current/static/libpq-ssl.html for more information on the modes.

Default of prefer matches libpq default.

Choices:

  • allow

  • disable

  • prefer ← (default)

  • require

  • verify-ca

  • verify-full

trust_input

boolean

added in 0.2.0 of community.postgresql

If no, check whether a value of session_role is potentially dangerous.

It makes sense to use no only when SQL injections via session_role are possible.

Choices:

  • no

  • yes ← (default)

Notes

Note

  • Supports check_mode.

  • The default authentication assumes that you are either logging in as or sudo’ing to the postgres account on the host.

  • To avoid “Peer authentication failed for user postgres” error, use postgres user as a become_user.

  • This module uses psycopg2, a Python PostgreSQL database adapter. You must ensure that psycopg2 is installed on the host before using this module.

  • If the remote host is the PostgreSQL server (which is the default case), then PostgreSQL must also be installed on the remote host.

  • For Ubuntu-based systems, install the postgresql, libpq-dev, and python-psycopg2 packages on the remote host before using this module.

  • The ca_cert parameter requires at least Postgres version 8.4 and psycopg2 version 2.4.3.

See Also

See also

community.postgresql.postgresql_info

The official documentation on the community.postgresql.postgresql_info module.

Examples

# PostgreSQL ping dbsrv server from the shell:
# ansible dbsrv -m postgresql_ping

# In the example below you need to generate certificates previously.
# See https://www.postgresql.org/docs/current/libpq-ssl.html for more information.
- name: >
    Ping PostgreSQL server using non-default credentials and SSL
    registering the return values into the result variable for future use
  community.postgresql.postgresql_ping:
    db: protected_db
    login_host: dbsrv
    login_user: secret
    login_password: secret_pass
    ca_cert: /root/root.crt
    ssl_mode: verify-full
  register: result
  # If you need to fail when the server is not available,
  # uncomment the following line:
  #failed_when: not result.is_available

# You can use the registered result with another task
- name: This task should be executed only if the server is available
  # ...
  when: result.is_available == yes

Return Values

Common return values are documented here, the following are the fields unique to this module:

Key

Description

conn_err_msg

string

added in 1.7.0 of community.postgresql

Connection error message.

Returned: always

Sample: “”

is_available

boolean

PostgreSQL server availability.

Returned: always

Sample: true

server_version

dictionary

PostgreSQL server version.

Returned: always

Sample: {“full”: “13.2”, “major”: 13, “minor”: 2, “raw”: “PostgreSQL 13.2 on x86_64-pc-linux-gnu”}

Authors

  • Andrew Klychkov (@Andersson007)