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MySQL主主复制结构区别于主从复制结构。在主主复制结构中,两台服务器的任
何一台上面的数据库存发生了改变都会同步到另一台服务器上,这样两台服务器
互为主从,并且都能向外提供服务。 这就比使用主从复制具有更好的性能。
接下来我将使用两个同样的服务器来实现这个效果:
具体Mysql的安装我就省略了,在上一篇的Mysql的主从架构的配置中有详细介绍
server1_mysql:192.168.1.108
server2_mysql: 192.168.1.110
拓扑结构:
server1_mysql-------server2_mysql
1.创建用户并授权
server1:
mysql> GRANT REPLICATION SLAVE ON *.* TO 'server2'@'192.168.1.110'
IDENTIFIED BY 'server2';
server2:
mysql> GRANT REPLICATION SLAVE ON *.* TO 'server1'@'192.168.1.108'
IDENTIFIED BY 'server1';
2.修改Mysql的主配置文件
server1:
[mysqld]
server-id = 10
log-bin = mysql-bin
replicate-do-db = mydb
auto-increment-increment = 2 //每次增长2
auto-increment-offset = 1 //设置自动增长的字段的偏移量,即初始值为2
启动Mysql服务:
# service mysqld restart
server2:
[mysqld]
server-id = 20
log-bin = mysql-bin
replicate-do-db = mydb
auto-increment-increment = 2 //每次增长2
auto-increment-offset = 2 //设置自动增长的字段的偏移量,即初始值为2
启动Mysql服务:
# service mysqld restart
注:二都只有server-id不同和 auto-increment- offset不同
auto-increment-increment的值应设为整个结构中服务器的总数,本案例用到两
台服务器,所以值设为2。
3.重新启动两个服务器
# service mysqld restart
4.为了让两个数据库一样,我们备份其中一个数据库,然后在另一个数据库上恢
复,这样是两个数据库一开始都是一样的。
在server1上操作:
# mysqldump --databases luowei > /tmp/luowei.sql
在server2上操作:
创建一个与mydb同名的空数据库
# mysql
> CREATE DATABASE mydb;
>/q
# scp 192.168.1.108:/tmp/mydb.sql ./
# mysql -uroot -p mydb 5.然后两个服务器相互通告二进制日志的位置并启动复制功能:
在server1上:
# mysql
> CHANGE MASTER TO
> MASTER_HOST='192.168.1.110',
> MASTER_USER='server2',
> MASTER_PASSWORD='server2';
mysql > START SLAVE;
在server2上:
# mysql
> CHANGE MASTER TO
> MASTER_HOST='192.168.1.108',
> MASTER_USER='server1',
> MASTER_PASSWORD='server1';
mysql > START SLAVE;
6.查看,并验证:
分别在两个数据库服务器上查看
mysql > START SLAVE;
然后查看数据库和表,你会发现内容是一样的,这样就是整个主主Mysql的架构
的配置过程。
作者“IT梦-齐-分享”

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