主从复制（双主复制）

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传送门：CentOS 6.5 源码安装MySQL-5.6.35
http://www.jianshu.com/p/f597d1e154f6

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MySQL双主复制，即互为Master-Slave(只有一个Master提供写操作)

双主复制可以实现数据库服务器的热备，结合Keepalived实现动态切换，实现了双主对外的统一接口以及自动检查、失败切换机制。联合使用，可以实现MySQL数据库的高可用方案。（在本文仅做双主复制的部署）

环境：CentOS 6.5
MASTER1:192.168.81.11
MASTER2:192.168.81.12

分别修改Master1和Master2 的配置文件

[root@localhost ~]# vim /usr/local/mysql/my.cnf

MASTER1:

[mysqld]
log-bin=mysql-bin                   #打开二进制日志
server-id=1                         #服务器id（不能相同）
expire-logs-days=100                #自动清理100天前的日志
replicate-do-db=test
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
auto-increment-increment=2
auto-increment-offset=1

MASTER2:

[mysqld]
log-bin=mysql-bin
server-id=2
expire-logs-days=100
replicate-do-db=test
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
auto-increment-increment=2
auto-increment-offset=2
character-set-server=utf8

重新启动数据库

[root@localhost ~]# service mysql restart
Shutting down MySQL.. SUCCESS! 
Starting MySQL.. SUCCESS!

进入数据库配置双主同步

[root@localhost ~]# mysql -u root -p
Enter password: 

MASTER1：

mysql> grant replication slave on *.* to slave@'192.168.81.12' identified by 'ibelieveicanfly';
Query OK, 0 rows affected (0.05 sec)

mysql> show master status;
+------------------+----------+--------------+--------------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB         | Executed_Gtid_Set |
+------------------+----------+--------------+--------------------------+-------------------+
| mysql-bin.000001 |      336 |              | mysql,information_schema |                   |
+------------------+----------+--------------+--------------------------+-------------------+
1 row in set (0.00 sec)

MASTER2：

mysql> grant replication slave on *.* to slave@'192.168.81.11' identified by 'ibelieveicanfly';
Query OK, 0 rows affected (0.05 sec)

mysql> show master status;
+------------------+----------+--------------+--------------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB         | Executed_Gtid_Set |
+------------------+----------+--------------+--------------------------+-------------------+
| mysql-bin.000001 |      336 |              | mysql,information_schema |                   |
+------------------+----------+--------------+--------------------------+-------------------+
1 row in set (0.00 sec)

MASTER1：

mysql> stop slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> change master to
    -> master_host='192.168.81.12',
    -> master_user='slave',
    -> master_password='ibelieveicanfly',
    -> master_log_file='mysql-bin.000001',
    -> master_log_pos=336;
Query OK, 0 rows affected, 2 warnings (0.06 sec)

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

MASTER2:

mysql> stop slave;
Query OK, 0 rows affected, 1 warning (0.03 sec)

mysql> change master to
    -> master_host='192.168.81.11',
    -> master_user='slave',
    -> master_password='ibelieveicanfly',
    -> master_log_file='mysql-bin.000001',
    -> master_log_pos=336;
Query OK, 0 rows affected, 2 warnings (0.07 sec)

mysql> start slave;
Query OK, 0 rows affected (0.05 sec)

查看是否同步成功（出现双yes即为成功）

mysql> show slave status\G;
        Slave_IO_Running: Yes
        Slave_SQL_Running: Yes