MYsql 主从双向同步

主库:my.cnf

server-id=1  ######只能有一个server-id

binlog-do-db=test   ####需要同步的数据库,多个多行写

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

binlog-do-db=test   ####需要同步的数据库,多个多行写

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   ####闲置时定期同步可更改master.info

              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 和主库IO通信判断
            Slave_SQL_Running: Yes ####必须是yes  自身SQL执行判断,

为NO时,可能从库与主库数据表结构不一致导致执行SQL语句出错,执行 stop slave; set GLOBAL SQL_SLAVE_SKIP_COUNTER=1; start slave;

 

              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