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mysql的双主模式

mysql主主复制配置

server1 ip:192.168.0.231
server2 ip:192.168.0.234


更改两台主机的mysql配置文件
vim /etc/my.cnf
server1添加
server-id=1
log-bin=mysqlmaster-bin.log
auto-increment-increment=2
auto-increment-offset=1


server2添加
server-id=2
log-bin=mysqlmaster-bin.log
auto-increment-increment=2
auto-increment-offset=2

说明:auto-increment-increment的值设为整个结构中服务器的总数,此实验为两台服务器,所以值为2
auto-increment-offset是用来设定数据库中自动增长的起点的,因为服务器都设定了一次自动增长的值为2,所以他们的起点必须得不同,这样才能避免两台服务器数据同步时出现主键冲突

另可以设置replicate-do-db=database-name指定需要同步的数据库

重启mysql服务使配置生效

登陆mysql

添加同步数据所需要的用户

server1上

mysql>GRANT REPLICATION SLAVE ON *.* TO ‘systop1‘@‘192.168.0.%‘ IDENTIFIED BY ‘systop‘;

server2上

GRANT REPLICATION SLAVE ON *.* TO ‘systop2‘@‘192.168.0.%‘ IDENTIFIED BY ‘systop‘;


查看两台服务器的master状态

server1

SHOW MASTER STATUS;
+------------------------+----------+--------------+------------------+-------------------+
| File                   | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------------+----------+--------------+------------------+-------------------+
| mysqlmaster-bin.000002 |      120 |              |                  |                   |



server2

show master status;
+------------------------+----------+--------------+------------------+-------------------+
| File                   | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------------+----------+--------------+------------------+-------------------+
| mysqlmaster-bin.000001 |      336 |              |                  |                   |


说明二进制日志路径

server2上执行

CHANGE MASTER TO MASTER_HOST=‘192.168.0.231‘,MASTER_USER=‘systop1‘,MASTER_PASSWORD=‘systop‘,MASTER_LOG_FILE=‘mysql-bin.000002‘,MASTER_LOG_POS=120;


server1上执行

CHANGE MASTER TO MASTER_HOST=‘192.168.0.234‘,MASTER_USER=‘systop2‘,MASTER_PASSWORD=‘systop‘,MASTER_LOG_FILE=‘mysqlmaster-bin.000001‘,MASTER_LOG_POS=336;



开启复制功能

两台机器都执行
start slave;

查看复制连接状态
执行
show slave status \G;
查看Slave_IO_Running: Yes
   Slave_SQL_Running: Yes
都显示yes表示启动正常

测试:两台服务器都做数据更新操作,查看数据是否更新

 

mysql的双主模式