主主复制其实就是Master1和Master2互为主从，下面具体演示其搭建过程。
一 软件环境
- Mysql 5.7.21
- Oracle Linux 7.1
二 主机设置
- Master1 IP：10.24.33.186
- Master2 IP：10.24.33.188
三 主主配置
1、Master1到Master2的主从复制环境搭建过程可参考：MySQL搭建主从复制环境
注意：因为互为主从，注意自动生成的序列的设置。
Master1的配置文件：
[root@strong mysql]# more /etc/my.cnf [mysqld] character-set-server=utf8 basedir=/usr/local/mysql datadir=/usr/local/mysql/data log-bin=/usr/local/mysql/binlog/mysql-bin server-id=1 gtid_mode=ON enforce-gtid-consistency=true auto_increment_increment=2 auto_increment_offset=1 [mysql] default-character-set=utf82、Master2到Master2的主从复制环境搭建如下：
1）创建复制用户
mysql> create user 'repl'@'10.24.33.186' identified by 'repl'; Query OK, 0 rows affected (0.04 sec) mysql> grant replication slave on *.* to 'repl'@'10.24.33.186'; Query OK, 0 rows affected (0.01 sec) mysql>2）设置Master1配置
mysql> change master to
-> master_host='10.24.33.188',
-> master_port=3306,
-> master_user='repl',
-> master_password='repl',
-> master_auto_position=1;--基于GTID实现
Query OK, 0 rows affected, 2 warnings (0.05 sec)
mysql> start slave;
Query OK, 0 rows affected (0.03 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.24.33.188
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000018
Read_Master_Log_Pos: 194
Relay_Log_File: strong-relay-bin.000016
Relay_Log_Pos: 407
Relay_Master_Log_File: mysql-bin.000018
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 194
Relay_Log_Space: 1339
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 2
Master_UUID: fb42b433-06fc-11e8-b91a-0800275b8da0
Master_Info_File: /usr/local/mysql/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: fb42b433-06fc-11e8-b91a-0800275b8da0:1-5
Executed_Gtid_Set: 2a3e3fd9-0587-11e8-bdb8-0800272325a8:1-21,
fb42b433-06fc-11e8-b91a-0800275b8da0:1-5
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
3）Master2的配置文件
[root@strong ~]# more /etc/my.cnf [mysqld] character-set-server=utf8 basedir=/usr/local/mysql datadir=/usr/local/mysql/data log-bin=/usr/local/mysql/binlog/mysql-bin server-id=2 gtid_mode=ON enforce_gtid_consistency=true auto_increment_increment=2 auto_increment_offset=2
1、Master1操作
mysql> use test;
Database changed
mysql> insert into t_mm (name) values('Alen'),('Jack'),('Summer');
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select *from t_mm;
+----+--------+---------------------+
| id | name | cdate |
+----+--------+---------------------+
| 1 | Alen | 2018-02-28 17:26:08 |
| 3 | Jack | 2018-02-28 17:26:08 |
| 5 | Summer | 2018-02-28 17:26:08 |
+----+--------+---------------------+
3 rows in set (0.00 sec)
2、Master2操作
mysql> use test;
Database changed
mysql> insert into t_mm (name) values('China'),('Japon'),('USA');
Query OK, 3 rows affected (0.04 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select *from t_mm;
+----+-------+---------------------+
| id | name | cdate |
+----+-------+---------------------+
| 2 | China | 2018-02-28 17:26:26 |
| 4 | Japon | 2018-02-28 17:26:26 |
| 6 | USA | 2018-02-28 17:26:26 |
+----+-------+---------------------+
3 rows in set (0.00 sec)
3、分别查看Master1和Master2，出现相同的结果
mysql> select *from t_mm; +----+--------+---------------------+ | id | name | cdate | +----+--------+---------------------+ | 1 | Alen | 2018-02-28 17:26:08 | | 2 | China | 2018-02-28 17:26:26 | | 3 | Jack | 2018-02-28 17:26:08 | | 4 | Japon | 2018-02-28 17:26:26 | | 5 | Summer | 2018-02-28 17:26:08 | | 6 | USA | 2018-02-28 17:26:26 | +----+--------+---------------------+ 6 rows in set (0.00 sec)至此，主主复制环境搭建成功。