community.mysql.mysql_replication module – Manage MySQL replication

Note

This module is part of the community.mysql collection (version 3.7.2).

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.mysql. You need further requirements to be able to use this module, see Requirements for details.

To use it in a playbook, specify: community.mysql.mysql_replication.

Synopsis

  • Manages MySQL server replication, replica, primary status, get and change primary host.

Requirements

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

  • mysqlclient (Python 3.5+) or

  • PyMySQL (Python 2.7 and Python 3.x) or

  • MySQLdb (Python 2.x)

Parameters

Parameter

Comments

ca_cert

aliases: ssl_ca

path

The path to a Certificate Authority (CA) certificate. This option, if used, must specify the same certificate as used by the server.

channel

string

added in community.mysql 0.1.0

Name of replication channel.

Multi-source replication is supported from MySQL 5.7.

Mutually exclusive with connection_name.

For more information see https://dev.mysql.com/doc/refman/8.0/en/replication-multi-source.html.

check_hostname

boolean

added in community.mysql 1.1.0

Whether to validate the server host name when an SSL connection is required. Corresponds to MySQL CLIs --ssl switch.

Setting this to false disables hostname verification. Use with caution.

Requires pymysql >= 0.7.11.

This option has no effect on MySQLdb.

Choices:

  • false

  • true

client_cert

aliases: ssl_cert

path

The path to a client public key certificate.

client_key

aliases: ssl_key

path

The path to the client private key.

config_file

path

Specify a config file from which user and password are to be read.

The default config file, ~/.my.cnf, if it exists, will be read, even if config_file is not specified.

The default config file, ~/.my.cnf, if it exists, must contain a [client] section as a MySQL connector requirement.

To prevent the default config file from being read, set config_file to be an empty string.

Default: "~/.my.cnf"

connect_timeout

integer

The connection timeout when connecting to the MySQL server.

Default: 30

connection_name

string

added in community.mysql 0.1.0

Name of the primary connection.

Supported from MariaDB 10.0.1.

Mutually exclusive with channel.

For more information see https://mariadb.com/kb/en/library/multi-source-replication/.

fail_on_error

boolean

added in community.mysql 0.1.0

Fails on error when calling mysql.

Choices:

  • false ← (default)

  • true

login_host

string

Host running the database.

In some cases for local connections the login_unix_socket=/path/to/mysqld/socket, that is usually /var/run/mysqld/mysqld.sock, needs to be used instead of login_host=localhost.

Default: "localhost"

login_password

string

The password used to authenticate with.

login_port

integer

Port of the MySQL server. Requires login_host be defined as other than localhost if login_port is used.

Default: 3306

login_unix_socket

string

The path to a Unix domain socket for local connections.

Use this parameter to avoid the Please explicitly state intended protocol error.

login_user

string

The username used to authenticate with.

mode

string

Module operating mode. Could be changeprimary (CHANGE PRIMARY TO), getprimary (SHOW PRIMARY STATUS), getreplica (SHOW REPLICA), startreplica (START REPLICA), stopreplica (STOP REPLICA), resetprimary (RESET PRIMARY) - supported since community.mysql 0.1.0, resetreplica (RESET REPLICA), resetreplicaall (RESET REPLICA ALL).

Choices:

  • "changeprimary"

  • "getprimary"

  • "getreplica" ← (default)

  • "startreplica"

  • "stopreplica"

  • "resetprimary"

  • "resetreplica"

  • "resetreplicaall"

primary_auto_position

aliases: master_auto_position

boolean

Whether the host uses GTID based replication or not.

Same as the MASTER_AUTO_POSITION mysql variable.

Choices:

  • false ← (default)

  • true

primary_connect_retry

aliases: master_connect_retry

integer

Same as the MASTER_CONNECT_RETRY mysql variable.

primary_delay

aliases: master_delay

integer

added in community.mysql 0.1.0

Time lag behind the primary’s state (in seconds).

Same as the MASTER_DELAY mysql variable.

Available from MySQL 5.6.

For more information see https://dev.mysql.com/doc/refman/8.0/en/replication-delayed.html.

primary_host

aliases: master_host

string

Same as the MASTER_HOST mysql variable.

primary_log_file

aliases: master_log_file

string

Same as the MASTER_LOG_FILE mysql variable.

primary_log_pos

aliases: master_log_pos

integer

Same as the MASTER_LOG_POS mysql variable.

primary_password

aliases: master_password

string

Same as the MASTER_PASSWORD mysql variable.

primary_port

aliases: master_port

integer

Same as the MASTER_PORT mysql variable.

primary_ssl

aliases: master_ssl

boolean

Same as the MASTER_SSL mysql variable.

When setting it to yes, the connection attempt only succeeds if an encrypted connection can be established.

For details, refer to MySQL encrypted replication documentation.

The default is false.

Choices:

  • false

  • true

primary_ssl_ca

aliases: master_ssl_ca

string

Same as the MASTER_SSL_CA mysql variable.

For details, refer to MySQL encrypted replication documentation.

primary_ssl_capath

aliases: master_ssl_capath

string

Same as the MASTER_SSL_CAPATH mysql variable.

For details, refer to MySQL encrypted replication documentation.

primary_ssl_cert

aliases: master_ssl_cert

string

Same as the MASTER_SSL_CERT mysql variable.

For details, refer to MySQL encrypted replication documentation.

primary_ssl_cipher

aliases: master_ssl_cipher

string

Same as the MASTER_SSL_CIPHER mysql variable.

Specifies a colon-separated list of one or more ciphers permitted by the replica for the replication connection.

For details, refer to MySQL encrypted replication documentation.

primary_ssl_key

aliases: master_ssl_key

string

Same as the MASTER_SSL_KEY mysql variable.

For details, refer to MySQL encrypted replication documentation.

primary_ssl_verify_server_cert

boolean

added in community.mysql 3.5.0

Same as mysql variable.

Choices:

  • false ← (default)

  • true

primary_use_gtid

aliases: master_use_gtid

string

added in community.mysql 0.1.0

Configures the replica to use the MariaDB Global Transaction ID.

disabled equals MASTER_USE_GTID=no command.

To find information about available values see https://mariadb.com/kb/en/library/change-master-to/#master_use_gtid.

Available since MariaDB 10.0.2.

Choices:

  • "current_pos"

  • "replica_pos"

  • "disabled"

primary_user

aliases: master_user

string

Same as the MASTER_USER mysql variable.

relay_log_file

string

Same as mysql variable.

relay_log_pos

integer

Same as mysql variable.

Notes

Note

  • If an empty value for the parameter of string type is needed, use an empty string.

  • Requires the PyMySQL (Python 2.7 and Python 3.X) or MySQL-python (Python 2.X) package installed on the remote host. The Python package may be installed with apt-get install python-pymysql (Ubuntu; see ansible.builtin.apt) or yum install python2-PyMySQL (RHEL/CentOS/Fedora; see ansible.builtin.yum). You can also use dnf install python2-PyMySQL for newer versions of Fedora; see ansible.builtin.dnf.

  • Be sure you have mysqlclient, PyMySQL, or MySQLdb library installed on the target machine for the Python interpreter Ansible discovers. For example if ansible discovers and uses Python 3, you need to install the Python 3 version of PyMySQL or mysqlclient. If ansible discovers and uses Python 2, you need to install the Python 2 version of either PyMySQL or MySQL-python.

  • If you have trouble, it may help to force Ansible to use the Python interpreter you need by specifying ansible_python_interpreter. For more information, see https://docs.ansible.com/ansible/latest/reference_appendices/interpreter_discovery.html.

  • Both login_password and login_user are required when you are passing credentials. If none are present, the module will attempt to read the credentials from ~/.my.cnf, and finally fall back to using the MySQL default login of ‘root’ with no password.

  • If there are problems with local connections, using login_unix_socket=/path/to/mysqld/socket instead of login_host=localhost might help. As an example, the default MariaDB installation of version 10.4 and later uses the unix_socket authentication plugin by default that without using login_unix_socket=/var/run/mysqld/mysqld.sock (the default path) causes the error ``Host ‘127.0.0.1’ is not allowed to connect to this MariaDB server``.

  • Alternatively, you can use the mysqlclient library instead of MySQL-python (MySQLdb) which supports both Python 2.X and Python >=3.5. See https://pypi.org/project/mysqlclient/ how to install it.

  • If credentials from the config file (for example, /root/.my.cnf) are not needed to connect to a database server, but the file exists and does not contain a [client] section, before any other valid directives, it will be read and this will cause the connection to fail, to prevent this set it to an empty string, (for example config_file: '').

  • To avoid the Please explicitly state intended protocol error, use the login_unix_socket argument, for example, login_unix_socket: /run/mysqld/mysqld.sock.

  • Alternatively, to avoid using login_unix_socket argument on each invocation you can specify the socket path using the `socket` option in your MySQL config file (usually ~/.my.cnf) on the destination host, for example socket=/var/lib/mysql/mysql.sock.

See Also

See also

community.mysql.mysql_info

The official documentation on the community.mysql.mysql_info module.

MySQL replication reference

Complete reference of the MySQL replication documentation.

MySQL encrypted replication reference.

Setting up MySQL replication to use encrypted connection.

MariaDB replication reference

Complete reference of the MariaDB replication documentation.

Examples

# If you encounter the "Please explicitly state intended protocol" error,
# use the login_unix_socket argument
- name: Stop mysql replica thread
  community.mysql.mysql_replication:
    mode: stopreplica
    login_unix_socket: /run/mysqld/mysqld.sock

- name: Get primary binlog file name and binlog position
  community.mysql.mysql_replication:
    mode: getprimary

- name: Change primary to primary server 192.0.2.1 and use binary log 'mysql-bin.000009' with position 4578
  community.mysql.mysql_replication:
    mode: changeprimary
    primary_host: 192.0.2.1
    primary_log_file: mysql-bin.000009
    primary_log_pos: 4578

- name: Check replica status using port 3308
  community.mysql.mysql_replication:
    mode: getreplica
    login_host: ansible.example.com
    login_port: 3308

- name: On MariaDB change primary to use GTID current_pos
  community.mysql.mysql_replication:
    mode: changeprimary
    primary_use_gtid: current_pos

- name: Change primary to use replication delay 3600 seconds
  community.mysql.mysql_replication:
    mode: changeprimary
    primary_host: 192.0.2.1
    primary_delay: 3600

- name: Start MariaDB replica with connection name primary-1
  community.mysql.mysql_replication:
    mode: startreplica
    connection_name: primary-1

- name: Stop replication in channel primary-1
  community.mysql.mysql_replication:
    mode: stopreplica
    channel: primary-1

- name: >
    Run RESET MASTER command which will delete all existing binary log files
    and reset the binary log index file on the primary
  community.mysql.mysql_replication:
    mode: resetprimary

- name: Run start replica and fail the task on errors
  community.mysql.mysql_replication:
    mode: startreplica
    connection_name: primary-1
    fail_on_error: true

- name: Change primary and fail on error (like when replica thread is running)
  community.mysql.mysql_replication:
    mode: changeprimary
    fail_on_error: true

Return Values

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

Key

Description

queries

list / elements=string

added in community.mysql 0.1.0

List of executed queries which modified DB’s state.

Returned: always

Sample: ["CHANGE MASTER TO MASTER_HOST='primary2.example.com',MASTER_PORT=3306"]

Authors

  • Balazs Pocze (@banyek)

  • Andrew Klychkov (@Andersson007)