mysql数据库双向同步热备
环境：
Master server: 10.224.194.239
Slave server: 10.224.194.237
步骤：
1.分别在Master/Slaver mysql db 创建backup user：
GRANT FILE ON *.* TO backup@10.224.194.239 IDENTIFIED BY 'pass';
GRANT REPLICATION SLAVE ON *.* TO backup@10.224.194.239 IDENTIFIED BY 'pass';
GRANT FILE ON *.* TO backup@10.224.194.237 IDENTIFIED BY 'pass';
GRANT REPLICATION SLAVE ON *.* TO backup@10.224.194.237 IDENTIFIED BY 'pass';
2.在Master server配置/etc/my.cf 文件：
server-id = 1
binlog-do-db=test
binlog-ignore-db = mysql
replicate-do-db=test
replicate-ignore-db = mysql
master-host=10.224.194.237
master-user=backup
master-password=pass
master-port=3306
master-connect-retry=60
slave-skip-errors=all
3.在Master server配置/etc/my.cf 文件：
server-id = 2
binlog-do-db=test
binlog-ignore-db = mysql
replicate-do-db=test
replicate-ignore-db = mysql
master-host=10.224.194.239
master-user=backup
master-password=pass
master-port=3306
master-connect-retry=60
slave-skip-errors=all
4.重启mysql数据库，验证命令如下：
查看Master状态
show master status;
mysql> show master status;
+-----------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-----------------+----------+--------------+------------------+
| mysqllog.000003 | 301 | test | mysql |
+-----------------+----------+--------------+------------------+
1 row in set (0.00 sec)
查看Slave状态
show slave status \G;
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Reconnecting after a failed master event read
Master_Host: 10.224.194.239
Master_User: backup
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysqllog.000003
Read_Master_Log_Pos: 301
Relay_Log_File: mysqlgsb-relay-bin.000082
Relay_Log_Pos: 348
Relay_Master_Log_File: mysqllog.000003
Slave_IO_Running: No
Slave_SQL_Running: Yes
Replicate_Do_DB: test
Replicate_Ignore_DB: mysql
Replicate_Do_Table:
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