GTID主从复制转换为传统主从复制

GTID复制转换为传统主从复制

切换操作非常简单，可以在线完成。

第一步：检查当前主从是否正常

主库：

mysql> show master status;
+------------------+----------+--------------+------------------+------------------------------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set                        |
+------------------+----------+--------------+------------------+------------------------------------------+
| mysql-bin.000012 |      737 |              |                  | 5112a895-440a-11e9-b39b-005056986842:1-3 |
+------------------+----------+--------------+------------------+------------------------------------------+
1 row in set (0.00 sec)      

从库：

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.20.5
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000012
          Read_Master_Log_Pos: 737
               Relay_Log_File: 18c-dg-relay-bin.000005
                Relay_Log_Pos: 950
        Relay_Master_Log_File: mysql-bin.000012
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
省略。。。
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 5
                  Master_UUID: 5112a895-440a-11e9-b39b-005056986842
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set: 5112a895-440a-11e9-b39b-005056986842:1-3
            Executed_Gtid_Set: 5112a895-440a-11e9-b39b-005056986842:1-3
                Auto_Position: 1
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.00 sec)
      

从上面可以看出，当前主从状态正常。

第二步：停止SLAVE

mysql> stop slave;      

第三步：从库执行CHANGE MASTER命令

和搭建普通主从一样，执行​

​change master命令​

​指定具体的binlog文件和position，如下：

mysql> change master to master_auto_position=0,master_host='192.168.20.5', master_port=3306,master_user='rep',master_password='mysql',Master_Log_File='mysql-binlog.000012',Master_Log_Pos=737;      

第四步：从库启动SLAVE

mysql> START SLAVE;      

注意：binlog文件和position要对应。

修改GTID相关的参数

主库：

mysql> set global gtid_mode='on_permissive';
mysql> set global gtid_mode='off_permissive';
mysql> set global enforce_gtid_consistency=off;
mysql> set global gtid_mode=off;      

从库：

mysql> set global gtid_mode='on_permissive';
mysql> set global gtid_mode='off_permissive';
mysql> set global enforce_gtid_consistency=off;
mysql> set global gtid_mode=off;      

验证

show master status;      

show slave status\G