原文地址：http://www.cnblogs.com/zhongshengzhen/
原主数据库：192.168.137.33
原从数据库：192.168.137.197
需要先阅读并操作：http://www.cnblogs.com/zhongshengzhen/p/4919454.html
1、从数据库创建同步用户，将主数据库作为从库
原从数据库192.168.137.197上执行
创建主从复制的帐号，将192.168.137.33作为从库：
mysql> GRANT REPLICATION SLAVE,RELOAD,SUPER ON *.* TO backup@'192.168.137.33' IDENTIFIED BY '123456';
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
2、原主数据库192.168.137.33上执行
mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000005 | 106 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000005 | 106 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
mysql> stop slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> CHANGE MASTER TO
MASTER_HOST='192.168.137.197', MASTER_USER='backup',
MASTER_PASSWORD='123456',
MASTER_PORT=3306,
MASTER_LOG_FILE='mysql-bin.000001',
MASTER_LOG_POS=106,
MASTER_CONNECT_RETRY=10;
MASTER_PASSWORD='123456',
MASTER_PORT=3306,
MASTER_LOG_FILE='mysql-bin.000001',
MASTER_LOG_POS=106,
MASTER_CONNECT_RETRY=10;
Query OK, 0 rows affected (0.02 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave statusG;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.137.197
Master_User: backup
Master_Port: 3306
Connect_Retry: 10
Master_Log_File: mysql-bin.000005
Read_Master_Log_Pos: 274
Relay_Log_File: mysqld-relay-bin.000006
Relay_Log_Pos: 419
Relay_Master_Log_File: mysql-bin.000005
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: 274
Relay_Log_Space: 882
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:
1 row in set (0.00 sec)
ERROR:
No query specified
Query OK, 0 rows affected (0.00 sec)
mysql> show slave statusG;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.137.197
Master_User: backup
Master_Port: 3306
Connect_Retry: 10
Master_Log_File: mysql-bin.000005
Read_Master_Log_Pos: 274
Relay_Log_File: mysqld-relay-bin.000006
Relay_Log_Pos: 419
Relay_Master_Log_File: mysql-bin.000005
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: 274
Relay_Log_Space: 882
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:
1 row in set (0.00 sec)
ERROR:
No query specified
2、测试主从双向数据同步
分别在主库和从库插入一条数据，会发现，都可以同步到另一部数据库。至此，MySQL主从双向同步完毕。