postgresql_slot – Add or remove slots from a PostgreSQL database

New in version 2.8.

Synopsis

  • Add or remove physical or logical slots from a PostgreSQL database.

Requirements

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

  • psycopg2

Parameters

Parameter Choices/Defaults Comments
ca_cert
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.

aliases: ssl_rootcert
db
string
Name of database to connect to.

aliases: login_db
immediately_reserve
boolean
    Choices:
  • no ←
  • yes
Optional parameter the when yes specifies that the LSN for this replication slot be reserved immediately, otherwise the default, no, specifies that the LSN is reserved on the first connection from a streaming replication client.
Is available from PostgreSQL version 9.6.
Uses only with slot_type=physical.
Mutually exclusive with slot_type=logical.
login_host
string
Host running the database.
login_password
string
The password used to authenticate with.
login_unix_socket
string
Path to a Unix domain socket for local connections.
login_user
string
Default:
"postgres"
The username used to authenticate with.
name
string / required
Name of the slot to add or remove.

aliases: slot_name
output_plugin
string
Default:
"test_decoding"
All logical slots must indicate which output plugin decoder they're using.
This parameter does not apply to physical slots.
It will be ignored with slot_type=physical.
port
integer
Default:
5432
Database port to connect to.

aliases: login_port
session_role
string
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.
slot_type
string
    Choices:
  • logical
  • physical ←
Slot type.
ssl_mode
string
    Choices:
  • allow
  • disable
  • prefer ←
  • require
  • verify-ca
  • verify-full
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.
state
string
    Choices:
  • absent
  • present ←
The slot state.
state=present implies the slot must be present in the system.
state=absent implies the groups must be revoked from target_roles.

Notes

Note

  • Physical replication slots were introduced to PostgreSQL with version 9.4, while logical replication slots were added beginning with version 10.0.
  • 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
  • The default authentication assumes that you are either logging in as or sudo’ing to the postgres account on the host.
  • 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.

Examples

- name: Create physical_one physical slot if doesn't exist
  become_user: postgres
  postgresql_slot:
    slot_name: physical_one
    db: ansible

- name: Remove physical_one slot if exists
  become_user: postgres
  postgresql_slot:
    slot_name: physical_one
    db: ansible
    state: absent

- name: Create logical_one logical slot to the database acme if doen't exist
  postgresql_slot:
    name: logical_slot_one
    slot_type: logical
    state: present
    output_plugin: custom_decoder_one

- name: Remove logical_one slot if exists from the cluster running on another host and non-standard port
  postgresql_slot:
    name: logical_one
    login_host: mydatabase.example.org
    port: 5433
    login_user: ourSuperuser
    login_password: thePassword
    state: absent

Return Values

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

Key Returned Description
name
string
always
Name of the slot

Sample:
physical_one
queries
string
always
List of executed queries.

Sample:
["SELECT pg_create_physical_replication_slot('physical_one', False, False)"]


Status

Authors

  • John Scalia (@jscalia)
  • Andew Klychkov (@Andersson007)

Hint

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