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1、环境设置

10.0.0.132 master1
10.0.0.134 master2
setenforce 0
systemctl stop firewalld

2、配置my.cnf配置文件

master1上

vim /etc/my.cnf
	[client]
	socket=/usr/local/mysql/mysql.sock
	[mysqld]
	basedir=/usr/local/mysql
	datadir=/usr/local/mysql/data
	user=mysql
	pid-file=/usr/local/mysql/data/mysqld.pid
	log-error=/usr/local/mysql/data/mysql.err
	socket=/usr/local/mysql/mysql.sock
	port=3306
	server_id=1
	log-bin=mysql-bin
	gtid-mode=on
	enforce-gtid-consistency=1
	log_slave_updates = 1
	binlog-format=mixed
	auto-increment-increment=2          
	auto-increment-offset=1
systemctl restart mysqld

master2上

vim /etc/my.cnf
[client]
	socket=/usr/local/mysql/mysql.sock
	[mysqld]
	basedir=/usr/local/mysql
	datadir=/usr/local/mysql/data
	user=mysql
	pid-file=/usr/local/mysql/data/mysqld.pid
	log-error=/usr/local/mysql/data/mysql.err
	socket=/usr/local/mysql/mysql.sock
	port=3306
	server_id=2
	log-bin=mysql-bin
	gtid-mode=on
	enforce-gtid-consistency=1
	log_slave_updates = 1
	binlog-format=mixed
	auto-increment-increment=2  
	auto-increment-offset=2
systemctl restart mysqld

3、授权允许同步

master1上

mysql -uroot -p
mysql> grant replication slave on *.* to rep@'10.0.0.%' identified by '123';

master2上

mysql -uroot -p
mysql> grant replication slave on *.* to rep@'10.0.0.%' identified by '123';

4、开启slave同步

master1上

mysql> change master to master_host='10.0.0.134',master_user='rep',master_password='123',master_port=3306,master_autoter_auto_position=1;
mysql> start slave;

master2上

mysql> change master to master_host='10.0.0.132',master_user='rep',master_password='123',master_port=3306,master_autoter_auto_position=1;
mysql> start slave;

5、验证互为主从

master1上

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.0.0.134
                  Master_User: rep
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 154
               Relay_Log_File: master1-relay-bin.000002
                Relay_Log_Pos: 367
        Relay_Master_Log_File: mysql-bin.000001
             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: 154
              Relay_Log_Space: 576
              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: e59d0925-be6a-11e8-9cab-000c29b63bad
             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: 
            Executed_Gtid_Set: 
                Auto_Position: 1
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

master2上

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.0.0.132
                  Master_User: rep
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 154
               Relay_Log_File: master2-relay-bin.000002
                Relay_Log_Pos: 367
        Relay_Master_Log_File: mysql-bin.000001
             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: 154
              Relay_Log_Space: 576
              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: 1
                  Master_UUID: ceb0ca3d-8366-11e8-ad2b-000c298b7c9a
             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: 
            Executed_Gtid_Set: 
                Auto_Position: 1
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

6、安装keepalived

master1上

yum -y install keepalived

master2上

yum -y install keepalived

7、配置keepalived

master1上

vim /etc/keepalived/keepalived.conf

global_defs {
   router_id master1
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }   
    virtual_ipaddress {
        10.0.0.100 
    }   
}   

virtual_server 192.168.1.100 3306 {
    delay_loop 6
    lb_algo rr 
    lb_kind DR 
    persistence_timeout 50
    protocol TCP

    real_server 10.0.0.132 3306 {
        weight 1
        notify_down /etc/keepalived/bin/mysql.sh                  
        TCP_CHECK {
            connect_timeout 3
            retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
}

systemctl enable keepalived
systemctl start keepalived
mkdir /etc/keepalived/bin

vim /etc/keepalived/bin/mysql.sh

#!/bin/bash
pkill keepalived
/sbin/ifdown ens33 && /sbin/ifup ens33

chmod +x /etc/keepalived/bin/mysql.sh

master2上

vim /etc/keepalived/keepalived.conf

global_defs {
   router_id master2
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 50
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }   
    virtual_ipaddress {
        10.0.0.100 
    }   
}   

virtual_server 192.168.1.100 3306 {
    delay_loop 6
    lb_algo rr 
    lb_kind DR 
    persistence_timeout 50
    protocol TCP

    real_server 10.0.0.134 3306 {
        weight 1
        notify_down /etc/keepalived/bin/mysql.sh                  
        TCP_CHECK {
            connect_timeout 3
            retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
}

systemctl enable keepalived
systemctl start keepalived
mkdir /etc/keepalived/bin

vim /etc/keepalived/bin/mysql.sh

#!/bin/bash
pkill keepalived
/sbin/ifdown ens33 && /sbin/ifup ens33

chmod +x /etc/keepalived/bin/mysql.sh

8、最终验证（keepalived双主）

验证一

在master1上

ip addr show ens33可以看到我们设置vip

在master2上

ip addr show ens33没有vip出现

验证二

在两台数据库上授权允许remote用户允许远程登录

master1上

mysql -uroot -p
mysql> grant all on *.* to remote@'%' identified by '123';

master2上

mysql -uroot -p
mysql> grant all on *.* to remote@'%' identified by '123';

另寻找一台MySQL数据库使用vip远程访问数据库集群

查看server_id，图示为1，所以说明我们当前登录到了master1上；也证明了master1如今是active状态的，而master2是备份状态

我们创建创建一个数据库试试

回到master1上

再到master2上查看

这就说明我们的主从复制也是没有问题的

验证三：验证keepalived双主集群的可用性

首先停掉master1上mysqld服务

systemctl stop mysqld

再次查看master1的ens33网卡，vip已经消失

查看master2的ens33网卡，出现vip

再次通过vip远程登录，依然可以登录，而且可以看到server_id变成了2。

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