proxysql_backend_servers - Adds or removes mysql hosts from proxysql admin interface.

New in version 2.3.

Synopsis

  • The proxysql_backend_servers module adds or removes mysql hosts using the proxysql admin interface.

Requirements

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

  • PyMySQL (Python 2.7 and Python 3.X), or
  • MySQLdb (Python 2.x)

Parameters

Parameter Choices/Defaults Comments
comment Default:
Text field that can be used for any purposed defined by the user. Could be a description of what the host stores, a reminder of when the host was added or disabled, or a JSON processed by some checker script.
compression
If the value of compression is greater than 0, new connections to that server will use compression. If omitted the proxysql database default for compression is 0.
config_file Default:
Specify a config file from which login_user and login_password are to be read.
hostgroup_id Default:
0
The hostgroup in which this mysqld instance is included. An instance can be part of one or more hostgroups.
hostname
required
The ip address at which the mysqld instance can be contacted.
load_to_runtime
    Choices:
  • no
  • yes ←
Dynamically load config to runtime memory.
login_host Default:
127.0.0.1
The host used to connect to ProxySQL admin interface.
login_password Default:
None
The password used to authenticate to ProxySQL admin interface.
login_port Default:
6032
The port used to connect to ProxySQL admin interface.
login_user Default:
None
The username used to authenticate to ProxySQL admin interface.
max_connections
The maximum number of connections ProxySQL will open to this backend server. If omitted the proxysql database default for max_connections is 1000.
max_latency_ms
Ping time is monitored regularly. If a host has a ping time greater than max_latency_ms it is excluded from the connection pool (although the server stays ONLINE). If omitted the proxysql database default for max_latency_ms is 0.
max_replication_lag
If greater than 0, ProxySQL will reguarly monitor replication lag. If replication lag goes above max_replication_lag, proxysql will temporarily shun the server until replication catches up. If omitted the proxysql database default for max_replication_lag is 0.
port Default:
3306
The port at which the mysqld instance can be contacted.
save_to_disk
    Choices:
  • no
  • yes ←
Save config to sqlite db on disk to persist the configuration.
state
    Choices:
  • present ←
  • absent
When present - adds the host, when absent - removes the host.
status
    Choices:
  • ONLINE
  • OFFLINE_SOFT
  • OFFLINE_HARD
ONLINE - Backend server is fully operational. OFFLINE_SOFT - When a server is put into OFFLINE_SOFT mode, connections are kept in use until the current transaction is completed. This allows to gracefully detach a backend. OFFLINE_HARD - When a server is put into OFFLINE_HARD mode, the existing connections are dropped, while new incoming connections aren't accepted either. If omitted the proxysql database default for status is ONLINE.
use_ssl
If use_ssl is set to True, connections to this server will be made using SSL connections. If omitted the proxysql database default for use_ssl is False.
weight
The bigger the weight of a server relative to other weights, the higher the probability of the server being chosen from the hostgroup. If omitted the proxysql database default for weight is 1.

Examples

---
# This example adds a server, it saves the mysql server config to disk, but
# avoids loading the mysql server config to runtime (this might be because
# several servers are being added and the user wants to push the config to
# runtime in a single batch using the M(proxysql_manage_config) module).  It
# uses supplied credentials to connect to the proxysql admin interface.

- proxysql_backend_servers:
    login_user: 'admin'
    login_password: 'admin'
    hostname: 'mysql01'
    state: present
    load_to_runtime: False

# This example removes a server, saves the mysql server config to disk, and
# dynamically loads the mysql server config to runtime.  It uses credentials
# in a supplied config file to connect to the proxysql admin interface.

- proxysql_backend_servers:
    config_file: '~/proxysql.cnf'
    hostname: 'mysql02'
    state: absent

Return Values

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

Key Returned Description
stdout
dict
 On create/update will return the newly modified host, on delete it will return the deleted record.
The mysql host modified or removed from proxysql

Sample:
{'msg': 'Added server to mysql_hosts', 'state': 'present', 'changed': True, 'hostname': '192.168.52.1', 'server': {'comment': '', 'status': 'ONLINE', 'compression': '0', 'weight': '1', 'hostname': '192.168.52.1', 'hostgroup_id': '1', 'use_ssl': '0', 'max_connections': '1000', 'port': '3306', 'max_latency_ms': '0', 'max_replication_lag': '0'}}


Status

This module is flagged as stableinterface which means that the maintainers for this module guarantee that no backward incompatible interface changes will be made.

Author

  • Ben Mildren (@bmildren)

Hint

If you notice any issues in this documentation you can edit this document to improve it.

© 2012–2018 Michael DeHaan
© 2018–2019 Red Hat, Inc.
Licensed under the GNU General Public License version 3.
https://docs.ansible.com/ansible/2.5/modules/proxysql_backend_servers_module.html