1. 准备工作
配置环境：centos6.9，mysql5.7
先安装、配置好两台MySQL服务器
server1 IP：192.168.1.1
server2 IP：192.168.1.2
mysql的安装请参考之前的文章：
LAMP环境搭建(centos6.9+apache2.4+mysql5.7+php7.1)
2. 在server1上操作
vi /etc/my.cnf
修改或添加下面这几行：
server-id=1
log-bin=mysql-bin # 启用二进制日志
auto-increment-increment = 2 #每次增长2
auto-increment-offset = 1 #设置自动增长的字段的偏移量
两个可选参数（2选1）：
binlog-do-db=db1,db2 #需要同步的库
binlog-ignore-db=db1,db2 #忽略不同步的库
保存后重启
/etc/init.d/mysqld restart
运行mysql客户端
mysql -uroot -p
创建同步账号
grant replication slave on *.* to ‘repl2‘@‘192.168.1.2‘ identified by ‘1234‘;
flush privileges;
锁表，不让数据写入
flush tables with read lock;
show master status;
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 613 | | mysql | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
记录下二进制日志文件名和位置
备份数据库
在mysql1上执行
mysqldump -uroot -p db1 > back.sql；
把备份好的数据拷贝到从服务器
scp back.sql 192.168.1.2:~
3. 在server2操作
vi /etc/my.cnf
修改或增加：
server-id=2 #这个数值不能和主一样
log-bin=mysql-bin # 启用二进制日志
auto-increment-increment = 2 #每次增长2
auto-increment-offset = 2 #设置自动增长的字段的偏移量
可选参数（2选1，这两个参数设置成和主一样）：
replicate-do-db=db1,db2
replicate-ignore-db=db1,db2
保存后重启
/etc/init.d/mysqld restart
把在server1上备份的数据导入server2
在server2上执行
[[email protected] ~]# mysqldump -uroot -p db1 < back.sql
运行mysql客户端
mysql -uroot -p
创建同步账号
grant replication slave on *.* to ‘repl1‘@‘192.168.1.1‘ identified by ‘1234‘;
flush privileges;
show master status;
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 613 | | mysql | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
记录下二进制日志文件名和位置
执行以下命令
stop slave;
change master to master_host=‘192.168.1.1‘,master_user=‘repl2‘,master_password=‘1234‘,master_log_file=‘mysql-bin.000001‘,master_log_pos=613;
(master_log_file和master_log_pos填上刚才记录下的二进制日志文件名和位置)
start slave;
查看从服务器的状态：
show slave status\G
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.1
Master_User: repl2
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 613
Relay_Log_File: server2-relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
4. 回到server1上操作
运行mysql客户端
mysql -uroot -p
取消server1上数据库的锁定
mysql> unlock tables;
执行以下命令
stop slave;
change master to master_host=‘192.168.1.2‘,master_user=‘repl1‘,master_password=‘1234‘,master_log_file=‘mysql-bin.000001‘,master_log_pos=613;
(master_log_file和master_log_pos填上刚才记录下的二进制日志文件名和位置)
start slave;
查看从服务器的状态：
show slave status\G
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.2
Master_User: repl1
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 613
Relay_Log_File: server1-relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
5. 主主复制测试
经测试，主主复制配置成功。
具体过程略，请自行请参考上一篇 mysql5.7主从配置 里的方法。