环境如下:
CentOS6.5_64

MySQL5.6.26
master1:192.168.1.112
master2:192.168.1.114

mysql 安装

这里就忽略了，主要就是一个细心。有时候一个不小心，就会发现安装失败。

配置master1
1.修改my.cnf文件，增加如下内容：
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[mysql

server-id =1 #数据库ID
log-bin=myslq-bin #启用二进制日志
binlog-do-db=tudou1 #需要同步的数据库,这里同步tudou1和tudou2两个数据库
binlog-do-db=tudou2
binlog-ignore-db=mysql #忽略同步的数据库
log-bin=/var/log/mysqlbin/bin_log #设置生成的log文件名，
如果没有var/log/mysqlbin这个目录，则需要创建，并且执行chown -R mysql.mysql /var/log/mysqlbin
log-slave-updates #把从库的写操作记录到binlog中
expire_logs_days=365 #日志文件过期天数，默认是 0，表示不过期
auto-increment-increment=2 #设定为主服务器的数量，防止 auto_increment 字段重复
auto-increment-offset=1 #自增长字段的初始值，在多台 master 环境下，不会出现自增
长 ID 重复

2.添加一个复制的帐号backup
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[root@localhost ~]# mysql -uroot -p123456
mysql>grant replication slave on . to backup@'%' identified by '123456';
mysql>flush privileges;
3.在防火墙里面添加mysql端口3306，并重启防火墙生效
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-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
4.在master2上测试用backup用户是否能连接到master1上的数据库
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[root@master ~]# mysql -ubackup -h 192.168.1.112 -p123456
配置master2

1.修改my.cnf文件，增加如下内容：
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[mysqld]

server-id =2 #数据库ID
log-bin=myslq-bin #启用二进制日志
binlog-do-db=tudou1 #需要同步的数据库,这里同步tudou1和tudou2两个数据库
binlog-do-db=tudou2
binlog-ignore-db=mysql #忽略同步的数据库
log-bin=/var/log/mysqlbin/bin_log #设置生成的log文件名，如果没有var/log/mysqlbin这个目录，则需要创建，并且执行chown -R mysql.mysql /var/log/mysqlbin
log-slave-updates #把从库的写操作记录到binlog中
expire_logs_days=365 #日志文件过期天数，默认是 0，表示不过期
auto-increment-increment=2 #设定为主服务器的数量，防止 auto_increment 字段重复
auto-increment-offset=2 #自增长字段的初始值，在多台 master 环境下，不会出现自增
长 ID 重复

2.添加一个复制的帐号backup
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[root@localhost ~]# mysql -uroot -p123456
mysql>grant replication slave on . to backup@'%' identified by '123456';
mysql>flush privileges;
3.在防火墙里面添加mysql端口3306，并重启防火墙生效
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-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
4.在master1上测试用backup用户是否能连接到master2上的数据库
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[root@master ~]# mysql -ubackup -h 192.168.1.114 -p123456
配置master1-master2同步

重启master1和master2的mysql服务
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[root@localhost ~]# service mysql restart
查看master状态
master1
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mysql> show master status;
+----------------+----------+----------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+----------------+----------+----------------+------------------+-------------------+
| bin_log.000001 | 120 | tudou1,tudou2 | mysql | |
+----------------+----------+----------------+------------------+-------------------+
1 row in set (0.00 sec)
master2
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mysql> show master status;
+----------------+----------+----------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+----------------+----------+----------------+------------------+-------------------+
| bin_log.000001 | 120 | tudou1,tudou2 | mysql | |
+----------------+----------+----------------+------------------+-------------------+
1 row in set (0.00 sec)
设置master1从master2同步
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mysql>CHANGE MASTER TO MASTER_HOST='192.168.1.114',MASTER_PORT=3306,MASTER_USER='backup',MASTER_PASSWORD='123456',MASTER_LOG_FILE='bin_log.00
0001',MASTER_LOG_POS=120;
mysql>start slave;
mysql>show slave status\G;
1. row
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.114
Master_User: backup
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: bin_log.000001
Read_Master_Log_Pos: 120
Relay_Log_File: master-relay-bin.000002
Relay_Log_Pos: 281
Relay_Master_Log_File: bin_log.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
如出现以下两项，则说明配置成功！
Slave_IO_Running: Yes
Slave_SQL_Running: Yes

设置master2从master1同步
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mysql>CHANGE MASTER TO MASTER_HOST='192.168.1.112',MASTER_PORT=3306,MASTER_USER='backup',MASTER_PASSWORD='123456',MASTER_LOG_FILE='bin_log.00
0001',MASTER_LOG_POS=120;
mysql>start slave;
mysql> show slave status\G;
1. row
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.112
Master_User: backup
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: bin_log.000001
Read_Master_Log_Pos: 120
Relay_Log_File: master2-relay-bin.000002
Relay_Log_Pos: 281
Relay_Master_Log_File: bin_log.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
如出现以下两项，则说明配置成功！
Slave_IO_Running: Yes
Slave_SQL_Running: Yes

测试主主同步：
进入master1 mysql数据库
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mysql> create database tudou1;
Query OK, 1 row affected (0.02 sec)

mysql> use tudou1;
Database changed
mysql> create table test(id int auto_increment,name varchar(10),primary key(id));
Query OK, 0 rows affected (0.01 sec)

mysql> insert into test(name) values('a');
Query OK, 1 row affected (0.01 sec)

mysql> insert into test(name) values('b');
Query OK, 1 row affected (0.00 sec)

mysql> insert into test(name) values('c');
Query OK, 1 row affected (0.01 sec)

mysql> select * from test;
+----+------+
| id | name |
+----+------+
| 1 | a |
| 3 | b |
| 5 | c |
+----+------+
3 rows in set (0.00 sec)
进master2，查看是否有tudou1这个数据库和test表。
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mysql> use tudou1;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show tables;
+------------------+
| Tables_in_tudou1 |
+------------------+
| test |
+------------------+
1 row in set (0.00 sec)

mysql> select from test;
+----+------+
| id | name |
+----+------+
| 1 | a |
| 3 | b |
| 5 | c |
+----+------+
3 rows in set (0.00 sec)
mysql>insert into test(name) values('d');
在master1的数据库中就会发现刚在master2插入的数据也插入到数据库了。
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mysql> select from test;
+----+------+
| id | name |
+----+------+
| 1 | a |
| 3 | b |
| 5 | c |
| 6 | d |
+----+------+