mysql主主互备

1、主机说明：

master-A:192.168.0.161

master-B:192.168.0.162

2、 授权用户

#server mysqld start

master-A>grant replication slave,file on *.* to 'tongbu'@'192.168.0.162' identified by '123456';

master-B>grant replication slave,file on *.* to 'tongbu'@'192.168.0.161' identified by '123456';

3、修改my.cnf

编辑配置文件vi /etc/my.cnf  加入以下内容

log-bin=mysql-bin

server-id=1

binlog-do-db=test   

binlog-ignore-db=mysql

replicate-ignore-db=mysql

replicate-do-db= test

log-slave-updates

slave-skip-errors=all

sync-binlog=1

auto-increment-increment=2

auto-increment-offset=1

备注：另一台 server-id=2；auto-increment-offset=2

binlog-do-db=test    修改需要同步的数据库名

4、查看同步的起始文件

master-A>show master status; //获得的参数写入B中

master-B>show master status; //获得的参数写入A中

记录初始的master_log_file的文件名和position

+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000019 | 11809679 | mysql         |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

我们把file＝mysql-bin.000019和position＝11809679 记下来

5、用change master 语句指定同步位置

master-A>change master to master_host='192.168.7.162',master_user='tongbu', master_password='123456',master_log_file='mysqlbin.000019',master_log_pos=11809679;

master-B>change master to master_host='192.168.7.161',master_user='tongbu', master_password='123456',master_log_file='mysqlbin.000019',master_log_pos=11809679;

启动同步 注意红色部分从show master status表中获得file＝mysql-bin.000019和position＝11809679

master-A> start slave;

master-A> show slave status\G;

master-B> start slave;

master-B> show slave status\G;

如果之前您的同步已经开启change之前要停止同步stop slave;

根据上述命令显示结果，检查slave状态

结果如下时，同步正常启动

Slave_IO_Running:YES

Slave_SQL_Running:YES

6、 检测同步是否正常完成

master-A>create tables aaa (id int)；

master-B>use test;

master-B>show tables;

master-B服务器中出现aaa表时，同步完成。