数据库主主复制

一、环境描述

服务器A   192.168.1.108

       服务器B   192.168.1.110

       Mysql版本：5.1.26

       System OS：CentOS release 5.4

二、主主配置过程

       1、创建同步用户：

              服务器A：

         grant replication slave,file on *.* to 'replication'@'192.168.1.110' identified by '123456';

flush privileges;

服务器B：

grant replication slave,file on *.* to 'replication'@'192.168.1.108' identified by '123456';

flush privileges;

2、修改mysql配置文件

       A：

log-bin=mysql-bin
server-id       = 1
binlog-do-db=test
binlog-ignore-db=mysql
replicate-do-db=test
replicate-ignore-db=mysql
log-slave-updates
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=1

       B：

log-bin=mysql-bin
server-id       = 2
binlog-do-db=test
binlog-ignore-db=mysql
replicate-do-db=test
replicate-ignore-db=mysql
log-slave-updates
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=2

参数选项说明：
log-slave-updates    将执行的复制sql记录到二进制日志
sync_binlog  当有二进制日志写入binlog文件的时候，mysql服务器将它同步到磁盘上
auto_increment_increment，auto_increment_offset 主要用于主主复制中，用来控制AUTO_INCREMENT列的操作

      

       3、重启mysql服务后，进入mysql命令行，执行操作如下：

              A:

              mysql> flush tables with read lock;

              mysql> show master statusG

*************************** 1. row ***************************

            File: mysql-bin.000028

            Position: 866

                   Binlog_Do_DB: test

Binlog_Ignore_DB: mysql

1 row in set (0.00 sec)

         mysql> unlock tables;

              mysql> stop slave;

mysql> change master to master_host='192.168.1.110',master_user='replication',master_password='123456',master_log_file='mysql-bin.000014', master_log_pos=704;

              mysql> start slave;

             

              B：

              mysql> flush tables with read lock;

              mysql> show master statusG

*************************** 1. row ***************************

            File: mysql-bin.000014

            Position: 704

                   Binlog_Do_DB: test

Binlog_Ignore_DB: mysql

1 row in set (0.00 sec)

         mysql> unlock tables;

              mysql> stop slave;

mysql> change master to master_host='192.168.1.108',master_user='replication',master_password='123456',master_log_file='mysql-bin.000028', master_log_pos=866;

              mysql> start slave;

       4、查看各服务器的状态：

              mysql> show slave statusG;

              出现：Slave_IO_Running: Yes

              Slave_SQL_Running: Yes

              则状态正常，直接测试数据能否同步就OK了！