Mysql互为主从顾名思义就是两台数据库都是主数据库同时也是对方的从数据库,只需在配置主从的基础下在将主数据库设置从数据库的从数据库,如图。


mysql-master-master-1.png

1、搭建互为主从

1) 试验环境

主数据库1:192.168.70.128

主数据库2:192.168.70.129

为了防止干扰,关闭防火墙 service iptables stop


2) 各自配置数据库配置文件my.cnf

① 主数据库1:192.168.70.128

[mysqld]

port = 3306 

log-bin=mysql-bin 

# server-id需要唯一 

server-id = 1 

#以下两步是主从复制没有的,为了防止自增id写入冲突 

#步进值auto_imcrement。一般有n台主MySQL就填n 

auto_increment_increment=2 

#起始值。一般填第n台主MySQL。

此时为第一台主MySQL auto_increment_offset=1


②主数据库2:192.168.70.129

[mysqld] 

port = 3306 

log-bin=mysql-bin 

# 唯一 

server-id = 2 

 auto_increment_increment=2 

# 第二台设置为2 

auto_increment_offset=2 

 #分别重启数据库service mysql restart


3) 以主数据1为准,主数据库2同步其数据

① 主数据库1:192.168.70.128 

[root@192 ~]# mysqldump -uroot -proot -A > all_data.sql 

[root@192 ~]# scp all_data.sql root@192.168.70.129:~ 


 ②主数据库2:192.168.70.129 

[root@192 ~]# mysql -uroot -proot < ~/all_data.sql

4) 查看当前bin-log的文件跟位置,并且授权双方登录 

① 主数据库1:192.168.70.128 

[root@192 ~]# mysql -uroot -proot mysql> show master status; 

mysql-master-master-2.png

mysql> GRANT REPLICATION SLAVE ON *.* TO mrslave@192.168.70.129 identified by "123456"; 

mysql> flush privileges; 


②主数据库2:192.168.70.129

[root@192 ~]# mysql -uroot -proot 

mysql> show master status;

mysql-master-master-3.png

mysql> GRANT REPLICATION SLAVE ON *.* TO mrslave@192.168.70.128 identified by "123456"; 

mysql> flush privileges;


5) 设置为双方从服务器

① 主数据库1:192.168.70.128 

mysql> CHANGE MASTER TO master_host ='192.168.70.129', master_user ='mrslave',master_password ='123456',master_log_file ='mysql-bin.000041',master_log_pos =909987; 

mysql> start slave; mysql>show slave status\G 

Slave_IO_State: Waiting for master to send event 

Master_Host: 192.168.70.129 

Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates 连接状态


②主数据库2:192.168.70.129 

mysql> CHANGE MASTER TO master_host ='192.168.70.128',master_user ='mrslave',master_password ='123456',master_log_file ='mysql-bin.000036',master_log_pos = 1865; 

mysql> start slave; mysql>show slave status\G 

Slave_IO_State: Waiting for master to send event 

Master_Host: 192.168.70.128 

Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates 连接状态


6)测试同步数据

① 主数据库1:192.168.70.128

mysql> use test; 

mysql> CREATE TABLE `tt` ( 

>`id` int(11) unsigned NOT NULL AUTO_INCREMENT, 

>`title` varchar(255) DEFAULT NULL, 

> PRIMARY KEY (`id`) 

> ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

mysql> INSERT INTO tt (`title`)VALUES('t1');

mysql> SELECT * FROM tt;

+----+-------+ 

| id | title | 

+----+-------+ 

| 1 | t1 | 

+----+-------+


②主数据库2:192.168.70.129 

mysql> use test; 

mysql> SELECT * FROM tt;

+----+-------+ 

| id | title | 

+----+-------+ 

| 1 | t1 | 

+----+-------+

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