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ansible/database/mysql_replication
Balazs Pocze 1a108a227e Changes made in documentation (EXAMPLES section added) 
Minor identation fixes
2013-08-08 00:10:06 +02:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
Ansible module to manage mysql replication
(c) 2013, Balazs Pocze <banyek@gawker.com>
Certain parts are taken from Mark Theunissen's mysqldb module
This file is part of Ansible
Ansible is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Ansible is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Ansible. If not, see <http://www.gnu.org/licenses/>.
"""
DOCUMENTATION = '''
---
module: mysql_replication
short_description: Manage MySQL replication
description:
- Manages MySQL server replication, slave, master status get and change master host.
options:
mode:
description:
- module operating mode. Could be getslave (SHOW SLAVE STATUS), getmaster (SHOW MASTER STATUS), changemaster (CHANGE MASTER TO), startslave (START SLAVE), stopslave (STOP SLAVE)
required: False
choices:
- getslave
- getmaster
- changemaster
- stopslave
- startslave
default: getslave
login_user:
description:
- username to connect mysql host, if defined login_password also needed.
required: False
login_password:
description:
- password to connect mysql host, if defined login_user also needed.
required: False
login_host:
description:
- mysql host to connect
required: False
login_unix_socket:
description:
- unix socket to connect mysql server
master_host:
description:
- same as mysql variable
master_user:
description:
- same as mysql variable
master_password:
description:
- same as mysql variable
master_port:
description:
- same as mysql variable
master_connect_retry:
description:
- same as mysql variable
master_log_file:
description:
- same as mysql variable
master_log_pos:
description:
- same as mysql variable
relay_log_file:
description:
- same as mysql variable
relay_log_pos:
description:
- same as mysql variable
master_ssl:
description:
- same as mysql variable
possible values: 0,1
master_ssl_ca:
description:
- same as mysql variable
master_ssl_capath:
description:
- same as mysql variable
master_ssl_cert:
description:
- same as mysql variable
master_ssl_key:
description:
- same as mysql variable
master_ssl_cipher:
description:
- same as mysql variable
'''
EXAMPLES = '''
# Stop mysql slave thread
- mysql_replication: mode=stopslave
# Get master binlog file name and binlog position
- mysql_replication: mode=getmaster
# Change master to master server 192.168.1.1 and use binary log 'mysql-bin.000009' with position 4578
- mysql_replication: mode=changemaster master_host=192.168.1.1 master_log_file=mysql-bin.000009 master_log_pos=4578
'''
import ConfigParser
import os
import warnings
try:
import MySQLdb
except ImportError:
mysqldb_found = False
else:
mysqldb_found = True
def get_master_status(cursor):
cursor.execute("SHOW MASTER STATUS")
masterstatus = cursor.fetchone()
return masterstatus
def get_slave_status(cursor):
cursor.execute("SHOW SLAVE STATUS")
slavestatus = cursor.fetchone()
return slavestatus
def stop_slave(cursor):
try:
cursor.execute("STOP SLAVE")
stopped = True
except:
stopped = False
return stopped
def start_slave(cursor):
try:
cursor.execute("START SLAVE")
started = True
except:
started = False
return started
def changemaster(cursor, chm):
SQLPARAM = ",".join(chm)
cursor.execute("CHANGE MASTER TO " + SQLPARAM)
def strip_quotes(s):
""" Remove surrounding single or double quotes
>>> print strip_quotes('hello')
hello
>>> print strip_quotes('"hello"')
hello
>>> print strip_quotes("'hello'")
hello
>>> print strip_quotes("'hello")
'hello
"""
single_quote = "'"
double_quote = '"'
if s.startswith(single_quote) and s.endswith(single_quote):
s = s.strip(single_quote)
elif s.startswith(double_quote) and s.endswith(double_quote):
s = s.strip(double_quote)
return s
def config_get(config, section, option):
""" Calls ConfigParser.get and strips quotes
See: http://dev.mysql.com/doc/refman/5.0/en/option-files.html
"""
return strip_quotes(config.get(section, option))
def load_mycnf():
config = ConfigParser.RawConfigParser()
mycnf = os.path.expanduser('~/.my.cnf')
if not os.path.exists(mycnf):
return False
try:
config.readfp(open(mycnf))
except (IOError):
return False
# We support two forms of passwords in .my.cnf, both pass= and password=,
# as these are both supported by MySQL.
try:
passwd = config_get(config, 'client', 'password')
except (ConfigParser.NoOptionError):
try:
passwd = config_get(config, 'client', 'pass')
except (ConfigParser.NoOptionError):
return False
# If .my.cnf doesn't specify a user, default to user login name
try:
user = config_get(config, 'client', 'user')
except (ConfigParser.NoOptionError):
user = getpass.getuser()
creds = dict(user=user, passwd=passwd)
return creds
def main():
module = AnsibleModule(
argument_spec = dict(
login_user=dict(default=None),
login_password=dict(default=None),
login_host=dict(default="localhost"),
login_unix_socket=dict(default=None),
mode=dict(default="getslave", choices=["getmaster", "getslave", "changemaster", "stopslave", "startslave"]),
master_host=dict(default=None),
master_user=dict(default=None),
master_password=dict(default=None),
master_port=dict(default=None),
master_connect_retry=dict(default=None),
master_log_file=dict(default=None),
master_log_pos=dict(default=None),
relay_log_file=dict(default=None),
relay_log_pos=dict(default=None),
master_ssl=dict(default=None, choices=[0,1]),
master_ssl_ca=dict(default=None),
master_ssl_capath=dict(default=None),
master_ssl_cert=dict(default=None),
master_ssl_key=dict(default=None),
master_ssl_cipher=dict(default=None),
)
)
user = module.params["login_user"]
password = module.params["login_password"]
host = module.params["login_host"]
mode = module.params["mode"]
master_host = module.params["master_host"]
master_user = module.params["master_user"]
master_password = module.params["master_password"]
master_port = module.params["master_port"]
master_connect_retry = module.params["master_connect_retry"]
master_log_file = module.params["master_log_file"]
master_log_pos = module.params["master_log_pos"]
relay_log_file = module.params["relay_log_file"]
relay_log_pos = module.params["relay_log_pos"]
master_ssl = module.params["master_ssl"]
master_ssl_ca = module.params["master_ssl_ca"]
master_ssl_capath = module.params["master_ssl_capath"]
master_ssl_cert = module.params["master_ssl_cert"]
master_ssl_key = module.params["master_ssl_key"]
master_ssl_cipher = module.params["master_ssl_cipher"]
if not mysqldb_found:
module.fail_json(msg="the python mysqldb module is required")
else:
warnings.filterwarnings('error', category=MySQLdb.Warning)
# Either the caller passes both a username and password with which to connect to
# mysql, or they pass neither and allow this module to read the credentials from
# ~/.my.cnf.
login_password = module.params["login_password"]
login_user = module.params["login_user"]
if login_user is None and login_password is None:
mycnf_creds = load_mycnf()
if mycnf_creds is False:
login_user = "root"
login_password = ""
else:
login_user = mycnf_creds["user"]
login_password = mycnf_creds["passwd"]
elif login_password is None or login_user is None:
module.fail_json(msg="when supplying login arguments, both login_user and login_password must be provided")
try:
if module.params["login_unix_socket"]:
db_connection = MySQLdb.connect(host=module.params["login_host"], unix_socket=module.params["login_unix_socket"], user=login_user, passwd=login_password, db="mysql")
else:
db_connection = MySQLdb.connect(host=module.params["login_host"], user=login_user, passwd=login_password, db="mysql")
cursor = db_connection.cursor()
except Exception, e:
module.fail_json(msg="unable to connect to database, check login_user and login_password are correct or ~/.my.cnf has the credentials")
if mode in "getmaster":
masterstatus = get_master_status(cursor)
try:
module.exit_json(
File=masterstatus[0],
Position=masterstatus[1],
Binlog_Do_DB=masterstatus[2],
Binlog_Ignore_DB=masterstatus[3]
)
except TypeError:
module.fail_json(msg="Server is not configured as mysql master")
elif mode in "getslave":
slavestatus = get_slave_status(cursor)
try:
module.exit_json(
Slave_IO_State=slavestatus[0],
Master_Host=slavestatus[1],
Master_User=slavestatus[2],
Master_Port=slavestatus[3],
Connect_Retry=slavestatus[4],
Master_Log_File=slavestatus[5],
Read_Master_Log_Pos=slavestatus[6],
Relay_Log_File=slavestatus[7],
Relay_Log_Pos=slavestatus[8],
Relay_Master_Log_File=slavestatus[9],
Slave_IO_Running=slavestatus[10],
Slave_SQL_Running=slavestatus[11],
Replicate_Do_DB=slavestatus[12],
Replicate_Ignore_DB=slavestatus[13],
Replicate_Do_Table=slavestatus[14],
Replicate_Ignore_Table=slavestatus[15],
Replicate_Wild_Do_Table=slavestatus[16],
Replicate_Wild_Ignore_Table=slavestatus[17],
Last_Errno=slavestatus[18],
Last_Error=slavestatus[19],
Skip_Counter=slavestatus[20],
Exec_Master_Log_Pos=slavestatus[21],
Relay_Log_Space=slavestatus[22],
Until_Condition=slavestatus[23],
Until_Log_File=slavestatus[24],
Until_Log_Pos=slavestatus[25],
Master_SSL_Allowed=slavestatus[26],
Master_SSL_CA_File=slavestatus[27],
Master_SSL_CA_Path=slavestatus[28],
Master_SSL_Cert=slavestatus[29],
Master_SSL_Cipher=slavestatus[30],
Master_SSL_Key=slavestatus[31],
Seconds_Behind_Master=slavestatus[32],
Master_SSL_Verify_Server_Cert=slavestatus[33],
Last_IO_Errno=slavestatus[34],
Last_IO_Error=slavestatus[35],
Last_SQL_Errno=slavestatus[36],
Last_SQL_Error=slavestatus[37],
Replicate_Ignore_Server_Ids=slavestatus[38],
Master_Server_Id=slavestatus[39]
)
except TypeError:
module.fail_json(msg="Server is not configured as mysql slave")
elif mode in "changemaster":
print "Change master"
chm=[]
if master_host:
chm.append("MASTER_HOST='" + master_host + "'")
if master_user:
chm.append("MASTER_USER='" + master_user + "'")
if master_password:
chm.append("MASTER_PASSWORD='" + master_password + "'")
if master_port:
chm.append("MASTER_PORT='" + master_port + "'")
if master_connect_retry:
chm.append("MASTER_CONNECT_RETRY='" + master_connect_retry + "'")
if master_log_file:
chm.append("MASTER_LOG_FILE='" + master_log_file + "'")
if master_log_pos:
chm.append("MASTER_LOG_POS=" + master_log_pos)
if relay_log_file:
chm.append("RELAY_LOG_FILE='" + relay_log_file + "'")
if relay_log_pos:
chm.append("RELAY_LOG_POS=" + relay_log_pos)
if master_ssl:
chm.append("MASTER_SSL=" + master_ssl)
if master_ssl_ca:
chm.append("MASTER_SSL_CA='" + master_ssl_ca + "'")
if master_ssl_capath:
chm.append("MASTER_SSL_CAPATH='" + master_ssl_capath + "'")
if master_ssl_cert:
chm.append("MASTER_SSL_CERT='" + master_ssl_cert + "'")
if master_ssl_key:
chm.append("MASTER_SSL_KEY='" + master_ssl_key + "'")
if master_ssl_cipher:
chm.append("MASTER_SSL_CIPTHER='" + master_ssl_cipher + "'")
changemaster(cursor,chm)
module.exit_json(changed=True)
elif mode in "startslave":
started = start_slave(cursor)
if started is True:
module.exit_json(msg="Slave started ", changed=True)
else:
module.exit_json(msg="Slave already started (Or cannot be started)", changed=False)
elif mode in "stopslave":
stopped = stop_slave(cursor)
if stopped is True:
module.exit_json(msg="Slave stopped", changed=True)
else:
module.exit_json(msg="Slave already stopped", changed=False)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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