MySQL主从双向同步

主库:my.cnf

server-id=1  ######只能有一个server-id

log-bin=MySQL-bin

master-host     =  192.168.0.121

master-user     =   copy  ###授权远程连接

master-password =  1

master-port     =  3306

从库:my.cnf

server-id=2  ######只能有一个server-id

log-bin=slave-bin

master-host     =  192.168.0.120

master-user     =   copy  ###授权远程连接

master-password =  1

master-port     =  3306

主从/usr/local/mysql/bin/mysql -uroot -p1

mysql>reset master   ######重置所有binlog日志

mysql>show slave status;

      Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.0.120
                  Master_User: copy
                  Master_Port: 3306
                Connect_Retry: 60   ####闲置时定期同步

              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 106   ######同步的pos位置
               Relay_Log_File: localhost-relay-bin.000005
                Relay_Log_Pos: 251
        Relay_Master_Log_File: mysql-bin.000002
             Slave_IO_Running: Yes  ####必须是yes
            Slave_SQL_Running: Yes ####必须是yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:

若同步不成功试着删除所有同步有关数据

/etc/init.d/mysql stop

 rm -rf   /usr/local/mysql/var /localhost-relay-bin.* master.info  mysql-bin.* relay-log.info

/etc/init.d/mysql start

同步成功后主从重启等等一般不会造成同步不成功的问题