MHA实现mysql主从手动切换方法

MHA是一款mysql主从配置服务器监控的软件了,我们可以利用它来实现mysql主从服务器监控并且保证它们的稳定性.

一、准备工作

1、分别在Master和Slave执行如下,方便mha检查复制:

1. grantallprivilegeson*.*to'root'@'10.1.1.231'identifiedby'rootpass';
2. grantallprivilegeson*.*to'root'@'10.1.1.234'identifiedby'rootpass';
3. grantreplicationslaveon*.*to'jpsync'@'10.1.1.231'identifiedby'jppasswd';
4. grantreplicationslaveon*.*to'jpsync'@'10.1.1.234'identifiedby'jppasswd';
5. flushprivileges;

2、将master设置为只读:

1. mysql>setglobalread_only=1;
2. QueryOK,0rowsaffected(0.00sec)
3. mysql>showvariableslike'read_only';
4. +---------------+-------+
5. |Variable_name|Value|
6. +---------------+-------+
7. |read_only|ON|
8. +---------------+-------+
9. 1rowinset(0.00sec)

交互模式:

#masterha_master_switch --master_state=alive --conf=/etc/masterha/app1.cnf --new_master_host=10.1.1.231 --new_master_port=63306

或非交互模式:

#masterha_master_switch --master_state=alive --conf=/etc/masterha/app1.cnf --new_master_host=10.1.1.231 --new_master_port=63306 —interactive=0

二、切换完以后,如何让10.1.1.231为主,10.1.1.234为从,操作步骤:

1、主上执行:

1. mysql>showmasterstatus;
2. +-------------------------+----------+--------------+--------------------------------------+-------------------+
3. |File|Position|Binlog_Do_DB|Binlog_Ignore_DB|Executed_Gtid_Set|
4. +-------------------------+----------+--------------+--------------------------------------+-------------------+
5. |mysql-master-bin.000013|120|denovo_ng|mysql,denovo,test,information_schema||
6. +-------------------------+----------+--------------+--------------------------------------+-------------------+
7. 1rowinset(0.00sec)

2、在10.1.1.234上执行如下sql命令；

1. changemastertomaster_host='10.1.1.231',master_port=63306,master_user='jpsync',
2. master_password='jppasswd',master_log_file='mysql-master-bin.000013',master_log_pos=120;
4. mysql>showslavestatus＼G;
5. ***************************1.row***************************
6. Slave_IO_State:Waitingformastertosendevent
7. Master_Host:10.1.1.231
8. Master_User:jpsync
9. Master_Port:63306
10. Connect_Retry:60
11. Master_Log_File:mysql-master-bin.000013
12. Read_Master_Log_Pos:120
13. Relay_Log_File:compute-0-52-relay-bin.000002
14. Relay_Log_Pos:290
15. Relay_Master_Log_File:mysql-master-bin.000013
16. Slave_IO_Running:Yes
17. Slave_SQL_Running:Yes

3、查看master状态,并测试:

1. mysql>showslavehosts;
2. +-----------+------+-------+-----------+--------------------------------------+
3. |Server_id|Host|Port|Master_id|Slave_UUID|
4. +-----------+------+-------+-----------+--------------------------------------+
5. |1052||63306|1025|e25a3e4a-39c0-11e4-80cb-00259086c4b6|
6. +-----------+------+-------+-----------+--------------------------------------+
7. 1rowinset(0.00sec)

主库10.1.1.231上插入记录:

1. mysql>insertintotest_slave_002values(555551111,1,55555,99999,44.11,2222,91919);
2. QueryOK,1rowaffected(0.00sec)

从库查询记录已经存在:

1. mysql>select*fromtest_slave_002whereid=555551111;
2. +-----------+-----+-----------+--------------+----------+----------------+--------------+
3. |id|tag|ticket_id|candidate_id|duration|source_file_id|source_start|
4. +-----------+-----+-----------+--------------+----------+----------------+--------------+
5. |555551111|1|55555|99999|44.11|2222|91919|
6. +-----------+-----+-----------+--------------+----------+----------------+--------------+
7. 1rowinset(0.00sec)

4、更新配置文件,更新主库my.cnf配置添加:

1,skip_slave_start

注意:防止重启数据库,启动slave进程,导致数据不一致.

更新从库my.cnf配置添加,设置slave库为只读:

1

2

read_only=1

relay_log_purge=0

然后重启主库和从库,观察库的信息:

主库信息:

1. mysql>showprocesslist;
2. +----+--------+------------------+------+-------------+------+-----------------------------------------------------------------------+------------------+
3. |Id|User|Host|db|Command|Time|State|Info|
4. +----+--------+------------------+------+-------------+------+-----------------------------------------------------------------------+------------------+
5. |1|jpsync|10.1.1.234:49085|NULL|BinlogDump|17|Masterhassentallbinlogtoslave;waitingforbinlogtobeupdated|NULL|
6. |2|root|localhost|NULL|Query|0|init|showprocesslist|
7. +----+--------+------------------+------+-------------+------+-----------------------------------------------------------------------+------------------+
8. 2rowsinset(0.00sec)
11. mysql>showmasterstatus;
12. +-------------------------+----------+--------------+--------------------------------------+-------------------+
13. |File|Position|Binlog_Do_DB|Binlog_Ignore_DB|Executed_Gtid_Set|
14. +-------------------------+----------+--------------+--------------------------------------+-------------------+
15. |mysql-master-bin.000014|120|denovo_ng|mysql,denovo,test,information_schema||
16. +-------------------------+----------+--------------+--------------------------------------+-------------------+
17. 1rowinset(0.00sec)

从库信息:

1. mysql>showslavestatus＼G;
2. ***************************1.row***************************
3. Slave_IO_State:Waitingformastertosendevent
4. Master_Host:10.1.1.231
5. Master_User:jpsync
6. Master_Port:63306
7. Connect_Retry:60
8. Master_Log_File:mysql-master-bin.000014
9. Read_Master_Log_Pos:120
10. Relay_Log_File:compute-0-52-relay-bin.000005
11. Relay_Log_Pos:290
12. Relay_Master_Log_File:mysql-master-bin.000014
13. Slave_IO_Running:Yes
14. Slave_SQL_Running:Yes
16. mysql>showprocesslist;
17. +----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+
18. |Id|User|Host|db|Command|Time|State|Info|
19. +----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+
20. |1|systemuser||NULL|Connect|58|Waitingformastertosendevent|NULL|
21. |2|systemuser||NULL|Connect|58|Slavehasreadallrelaylog;waitingfortheslaveI/Othreadtoupdateit|NULL|
22. |3|root|localhost|NULL|Query|0|init|showprocesslist|
23. +----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+
24. 3rowsinset(0.00sec)--phpfensi.com