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proxysql_backend_servers – Adds or removes mysql hosts from proxysql admin interface

Synopsis

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
path
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
boolean
    Choices:
  • no
  • yes ←
Dynamically load config to runtime memory.
login_host
string
Default:
"127.0.0.1"
The host used to connect to ProxySQL admin interface.
login_password
string
The password used to authenticate to ProxySQL admin interface.
login_port
integer
Default:
6032
The port used to connect to ProxySQL admin interface.
login_user
string
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 regularly 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
boolean
    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
boolean
    Choices:
  • no
  • yes
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
dictionary
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:
{'changed': True, 'hostname': '192.168.52.1', 'msg': 'Added server to mysql_hosts', 'server': {'comment': '', 'compression': '0', 'hostgroup_id': '1', 'hostname': '192.168.52.1', 'max_connections': '1000', 'max_latency_ms': '0', 'max_replication_lag': '0', 'port': '3306', 'status': 'ONLINE', 'use_ssl': '0', 'weight': '1'}, 'state': 'present'}


Status

Authors

  • 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/2.9/modules/proxysql_backend_servers_module.html