主1 192.168.66.15

主2 192.168.66.16

主1：

root@test2 ~]# hostname master1

[root@test2 ~]# bash

[root@master1 ~]# vim /etc/my.cnf

server-id=11     

log-bin=mysql-bin  

auto_increment_increment=2  

auto_increment_offset=1

replicate-do-db=demo_db

[root@master1 ~]# systemctl restart mysqld

[root@master1 ~]# mysql -u root -p123456

mysql> create user 'master1'@'%' identified with mysql_native_password by '123456';

Query OK, 0 rows affected (0.00 sec)

mysql> grant replication slave on *.* to 'master1'@'%';

Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> show grants for 'master1'@'%';

mysql> show master status;

主2：

[root@localhost ~]# hostname master2

[root@localhost ~]# bash

[root@master2 ~]# vim /etc/my.cnf

server-id=12

log-bin=mysql-bin

auto_increment_increment=2

auto_increment_offset=2

replicate-do-db=demo_db

[root@master2 ~]# systemctl restart mysqld

[root@master2 ~]# mysql -uroot -p123456

mysql> change master to master_host='192.168.66.25',

    -> master_user='master1',

    -> master_password='123456',

    -> master_log_file='mysql-bin.000001',

    -> master_log_pos=768;

start slave;

show slave status \G

mysql> create user 'master2'@'%' identified with mysql_native_password by '123456';

Query OK, 0 rows affected (0.00 sec)

mysql> grant replication slave on *.* to 'master2'@'%';

Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> show master status;

主1：

mysql> change master to master_host='192.168.66.16',

    -> master_user='master2',

    -> master_password='123456',

    -> master_log_file='mysql-bin.000001',

    -> master_log_pos=768;

start slave;

show slave status \G

主1：

create database demo_db;

use demo_db;

主2：

主2

use demo_db;

create table test(id int(4));

主1：