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| 关键词： nbsp Master 代码 mysql Slave 10.1 Relay log 1.231 show |
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 *.* to 'root'@'10.1.1.231' identified by 'rootpass';grant all privileges on *.* to 'root'@'10.1.1.234' identified by 'rootpass';grant replication slave on *.* to 'jpsync'@'10.1.1.231' identified by 'jppasswd';grant replication slave on *.* to 'jpsync'@'10.1.1.234' 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: Yes3、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=1relay_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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