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