database►Mysql►mysql master slave switch

mysql master slave switch

mysql 主从切换

1. Master 查看slave主机列表

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mysql> show slave hosts;
+-----------+------+------+-----------+--------------------------------------+
| Server_id | Host | Port | Master_id | Slave_UUID                           |
+-----------+------+------+-----------+--------------------------------------+
|       108 |      | 3306 |       111 | dff3b8d4-cab5-11e6-bcb2-080027c784a4 |
+-----------+------+------+-----------+--------------------------------------+

2. Slave 在slave上执行停止IO同步

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mysql> stop slave IO_THREAD;
Query OK, 0 rows affected (0.06 sec)

mysql> show slave status \G;
*************************** 1. row ***************************
               Slave_IO_State:
                  Master_Host: 192.168.1.111
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 491
               Relay_Log_File: mysqld-relay-bin.000002
                Relay_Log_Pos: 377
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: No
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 491
              Relay_Log_Space: 551
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 111
                  Master_UUID: a2207dde-caaf-11e6-bc89-080027770ec0
             Master_Info_File: /mnt/data/mysql/3306/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
1 row in set (0.00 sec)
ERROR:
No query specified

3. Slave 在slave上重置master状态

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mysql> reset master;
Query OK, 0 rows affected (0.06 sec)

4. Slave 上创建同步账号

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mysql> GRANT REPLICATION SLAVE ON *.* to 'repl'@'%' identified by 'repl123';
mysql> flush privileges;

5. Master 在master上同步slave

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mysql> change master to master_host='192.168.1.112',master_port=3306,master_user='repl',master_password='repl123';
mysql> start slave;

6. Master 在master验证

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mysql> show slave status \G;
mysql> show processlist \G;