| 标题 | MHA实现mysql主从数据库手动切换的方法 |
| 范文 | 本文实例讲述了MHA实现mysql主从数据库手动切换的方法，分享给大家供大家参考。具体方法如下： 一、准备工作 1、分别在Master和Slave执行如下,方便mha检查复制: 复制代码 代码如下:grant all privileges on *.* toidentified by 'rootpass'; grant all privileges on *.* to identified by 'rootpass'; grant replication slave on *.* to identified by 'jppasswd'; grant replication slave on *.* to identified by 'jppasswd'; flush privileges; 2、将master设置为只读 复制代码 代码如下:mysql> set global read_only=1; Query OK, 0 rows affected (0.00 sec) mysql> show variables like 'read_only'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | read_only | ON | +---------------+-------+ 1 row in set (0.00 sec) 交互模式: 复制代码 代码如下:#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: 复制代码 代码如下:#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: 复制代码 代码如下:mysql> show master status; +-------------------------+----------+--------------+--------------------------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +-------------------------+----------+--------------+--------------------------------------+-------------------+ | mysql-master-bin.000013 | 120 | denovo_ng | mysql,denovo,test,information_schema | | +-------------------------+----------+--------------+--------------------------------------+-------------------+ 1 row in set (0.00 sec) 2、在10.1.1.234上执行如下sql命令； 复制代码 代码如下:change master to master_host='10.1.1.231',master_port=63306,master_user='jpsync', master_password='jppasswd', master_log_file='mysql-master-bin.000013',master_log_pos=120; mysql> show slave status＼G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.1.1.231 Master_User: jpsync Master_Port: 63306 Connect_Retry: 60 Master_Log_File: mysql-master-bin.000013 Read_Master_Log_Pos: 120 Relay_Log_File: compute-0-52-relay-bin.000002 Relay_Log_Pos: 290 Relay_Master_Log_File: mysql-master-bin.000013 Slave_IO_Running: Yes Slave_SQL_Running: Yes 3、查看master状态，并测试 复制代码 代码如下:mysql> show slave hosts; +-----------+------+-------+-----------+--------------------------------------+ | Server_id | Host | Port | Master_id | Slave_UUID | +-----------+------+-------+-----------+--------------------------------------+ | 1052 | | 63306 | 1025 | e25a3e4a-39c0-11e4-80cb-00259086c4b6 | +-----------+------+-------+-----------+--------------------------------------+ 1 row in set (0.00 sec) 主库10.1.1.231上插入记录 复制代码 代码如下:mysql> insert into test_slave_002 values(555551111,1,55555,99999,44.11,2222,91919); Query OK, 1 row affected (0.00 sec) 从库查询记录已经存在 复制代码 代码如下:mysql> select * from test_slave_002 where id=555551111; +-----------+-----+-----------+--------------+----------+----------------+--------------+ | id | tag | ticket_id | candidate_id | duration | source_file_id | source_start | +-----------+-----+-----------+--------------+----------+----------------+--------------+ | 555551111 | 1 | 55555 | 99999 | 44.11 | 2222 | 91919 | +-----------+-----+-----------+--------------+----------+----------------+--------------+ 1 row in set (0.00 sec) 4、更新配置文件: 更新主库my.cnf配置添加 复制代码 代码如下: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: 复制代码 代码如下: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: 复制代码 代码如下:mysql> show processlist; +----+--------+------------------+------+-------------+------+-----------------------------------------------------------------------+------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+--------+------------------+------+-------------+------+-----------------------------------------------------------------------+------------------+ | 1 | jpsync | 10.1.1.234:49085 | NULL | Binlog Dump | 17 | Master has sent all binlog to slave; waiting for binlog to be updated | NULL | | 2 | root | localhost | NULL | Query | 0 | init | show processlist | +----+--------+------------------+------+-------------+------+-----------------------------------------------------------------------+------------------+ 2 rows in set (0.00 sec) mysql> show master status; +-------------------------+----------+--------------+--------------------------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +-------------------------+----------+--------------+--------------------------------------+-------------------+ | mysql-master-bin.000014 | 120 | denovo_ng | mysql,denovo,test,information_schema | | +-------------------------+----------+--------------+--------------------------------------+-------------------+ 1 row in set (0.00 sec) 从库信息: 复制代码 代码如下:mysql> show slave status＼G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.1.1.231 Master_User: jpsync Master_Port: 63306 Connect_Retry: 60 Master_Log_File: mysql-master-bin.000014 Read_Master_Log_Pos: 120 Relay_Log_File: compute-0-52-relay-bin.000005 Relay_Log_Pos: 290 Relay_Master_Log_File: mysql-master-bin.000014 Slave_IO_Running: Yes Slave_SQL_Running: Yes mysql> show processlist; +----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+ | 1 | system user | | NULL | Connect | 58 | Waiting for master to send event | NULL | | 2 | system user | | NULL | Connect | 58 | Slave has read all relay log; waiting for the slave I/O thread to update it | NULL | | 3 | root | localhost | NULL | Query | 0 | init | show processlist | +----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+ 3 rows in set (0.00 sec) 希望本文所述对大家的MySQL数据库程序设计有所帮助。 |
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