mysql主从复制

最新推荐文章于 2025-07-09 21:23:52 发布

原创最新推荐文章于 2025-07-09 21:23:52 发布 · 5k 阅读

0 ·

CC 4.0 BY-SA版权

mysql 专栏收录该内容

15 篇文章

订阅专栏

1.前置条件

a)主库版本：5.1.73
b)从库版本：5.7.17

2.修改主库my.cnf文件

log-bin=mysql-bin #[必须]启用二进制日志
server-id=1

3.修改从库my.cnf文件

log-bin=mysql-bin #[不是必须]启用二进制日志
server-id=102

4.重启两台服务器的mysql

/etc/init.d/mysql restart
或者service mysqld restart

5.在主服务器上建立帐户并授权slave

mysql>GRANT REPLICATION SLAVE ON . to ‘sync’@’%’ identified by ‘sync’;

6.登录主库mysql，查询master的状态

 mysql>show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      160 |              |                  |
+------------------+----------+--------------+------------------+

7.配置从服务器Slave

 mysql>change master to master_host='121.40.56.87',master_user='sync',
 master_password='sync',master_log_file='mysql-bin.000001',master_log_pos=160;

mysql>start slave; #启动从服务器复制功能
关闭slave服务器： stop slave/start slave
重置slave服务：reset slave

8.检查从服务器复制功能状态

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 121.40.56.87
                  Master_User: sync
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 1494
               Relay_Log_File: hechaojie-PC-relay-bin.000018
                Relay_Log_Pos: 295
        Relay_Master_Log_File: mysql-bin.000002
             Slave_IO_Running: Yes
            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: 1494
              Relay_Log_Space: 646
              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: 0
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: 1
                  Master_UUID:
             Master_Info_File: C:\mysql-5.7.17-winx64\data\master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more up
dates
           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
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.00 sec)

注：Slave_IO及Slave_SQL进程必须正常运行，即YES状态，否则都是错误的状态(如：其中一个NO均属错误)。
因此可以写shell脚本监控Slave_IO及Slave_SQL进程状态，判断主从复制是否有问题。