MM-SS 多源复制 双主双从

2018/05/16 - 14:48 
环境：centos7u4
    master1      10.0.0.131
    master2     10.0.0.130
    slave1       10.0.0.140
    slave2       10.0.0.141
    
    所有机器都作以下操做：
    修改主机名称
        分别为：master1和master2 slave1 slave2
    
    域名解析
        [root@master ~]# cat /etc/hosts
        127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
        ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

        10.0.0.131 master1
        10.0.0.130 master2
        10.0.0.140 slave1
        10.0.0.141 slave2

        
    ssh公钥    
    关闭selinux和防火墙
        [root@master ~]# setenforce 0 && systemctl stop firewalld

    
    确保时间一致    
    主机之间的连同性

下载并安装Mysql5.7(所有机器都做)
    #lftp 10.18.41.251
    > cd 1802
    > mirror mysql57
    
    # cd mysql57
    # rpm -ivh *.rpm
    
启动mysql:（所有机器都做）
    # systemctl start mysqld
    
    注意：
        mysql5.7启动之后自带密码，不能直接登陆
        获取mysql5.7初始启动密码：
            # grep passw /var/log/mysqld.log 
2018-05-15T07:12:00.852544Z 1 [Note] A temporary password is generated for root@localhost: N-+e*ZL:_3gh
   
   测试密码是否可用：   
   # mysql -uroot -p'N-+e*ZL:_3gh'     

   去掉简单密码限制功能(做实验的时候先不要作这一步)：
        #vim /etc/my.cnf   //追加如下选项
        [mysqld]
        validate_password=off
        
        重启服务
        修改成简单密码：现在密码为123

--------------------
master1:
    修改配置文件:
        #vim /etc/my.cnf    
        [mysqld]
log-bin
server-id=1
gtid_mode=ON
enforce_gtid_consistency=1    
        
    授权远程账户：
    mysql> grant replication slave,super,reload on *.* to slave@'%' identified by 'Qingyang@123';
    Query OK, 0 rows affected, 1 warning (0.00 sec)

    mysql> flush privileges;
 

master2:
    修改配置文件
        # vim /etc/my.cnf
            [mysqld]
log-bin
server-id=2
gtid_mode=ON
enforce_gtid_consistency=1    
    
     授权远程账户：
        mysql> grant replication slave,super,reload on *.* to slave@'%' identified by 'Qingyang@123';
        Query OK, 0 rows affected, 1 warning (0.00 sec)

        mysql> flush privileges;
        
重启master1和master2上的mysqld:
    [root@master1 mysql]# systemctl restart mysqld
    [root@master2 mysql]# systemctl restart mysqld
        
master:
        # mysql -u root -p'Qingyang@123'
        mysql > change master to
                       master_host='master2',
                       master_user='slave',
                       master_password='Qingyang@123',
                       master_auto_position=1;
        mysql > start slave;                       //启动slave角色
        mysql > show slave status\G         //查看状态

master2:
        # mysql -u root -p'Qingyang@123'
        mysql > change master to
                       master_host='master1',
                       master_user='slave',
                       master_password='Qingyang@123',
                       master_auto_position=1;
        mysql > start slave;                       //启动slave角色
        mysql > show slave status\G         //查看状态        

到此，互为主从配置成功！

接下来配置两台slave:
slave1:
修改配置文件
# vim /etc/my.cnf
[mysqld]
log-bin
server-id=3
gtid_mode=ON
enforce_gtid_consistency=1
master-info-repository=TABLE
relay-log-info-repository=TABLE

重启服务：
# systemctl restart mysqld

slave2:
修改配置文件
# vim /etc/my.cnf
[mysqld]
log-bin
server-id=4
gtid_mode=ON
enforce_gtid_consistency=1
master-info-repository=TABLE
relay-log-info-repository=TABLE

重启服务：
# systemctl restart mysqld

slave1:
# mysql -u root -p'Qingyang@123'
mysql> change master to  master_host='master1',master_user='slave',master_password='Qingyang@123',master_auto_position=1 for channel 'master1';

mysql> change master to  master_host='master2',master_user='slave',master_password='Qingyang@123',master_auto_position=1 for channel 'master2';

mysql> start slave;
      
slave2:
# mysql -u root -p'Qingyang@123'
mysql> change master to  master_host='master1',master_user='slave',master_password='Qingyang@123',master_auto_position=1 for channel 'master1';

mysql> change master to  master_host='master2',master_user='slave',master_password='Qingyang@123',master_auto_position=1 for channel 'master2';

mysql> start slave;      

两个slave分别查看状态：
mysql> show slave status \G
      
测试：
    1.只要slave状态中i/o进程和sql进程为YES，基本可以确定成功
    2.主服务器上写入数据，在从服务器上查看，如果能在从上看到数据，则成功！   
    

排错
mysql > stop slave;
mysql > reset master;
mysql > reset slave;