MySQL+Keepalived实现自动切换

Keepalived+mysql 自动切换

项目环境：
VIP 192.168.246.100
mysql1 192.168.246.162      keepalived-master
mysql2 192.168.246.163      keepalived-slave

一、mysql 主主同步(互为主从)        （不使用共享存储，数据保存本地存储）
二、安装keepalived 
三、keepalived主备配置文件
四、mysql状态检测脚本/root/bin/keepalived_check_mysql.sh
五、测试及诊断
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实施步骤：
一、mysql 主主同步 <略>
===================================================================================
mysql两个节点均操作
[root@mysql-keepalived-master ~]# yum -y install maraidb-server mariadb
[root@mysql-keepalived-master ~]# systemctl start mariadb
[root@mysql-keepalived-master ~]# mysql
节点1创建qf1库名，以便测试
MariaDB [(none)]> create database qf1;
MariaDB [(none)]> quit;
创建一个客户端能够测试连接的用户
MariaDB [(none)]> grant all privileges on *.* to root@'%' identified by '123456';
MariaDB [(none)]> flush privileges;

[root@mysql-keepalived-slave ~]# yum -y install mariadb-server mariadb
[root@mysql-keepalived-slave ~]# systemctl start mariadb
[root@mysql-keepalived-slave ~]# mysql
节点1创建qf2库名，以便测试
MariaDB [(none)]> create database qf2;
MariaDB [(none)]> quit;
创建一个客户端能够测试连接的用户
MariaDB [(none)]> grant all privileges on *.* to root@'%' identified by '123456';
MariaDB [(none)]> flush privileges;
====================================================================================

二、安装keepalived---两台机器都操作
[root@mysql-keepalived-master ~]# yum -y install keepalived
[root@mysql-keepalived-slave ~]# yum -y install keepalived
三、keepalived 主备配置文件
192.168.246.162 master配置
[root@mysql-keepalived-master ~]# mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
[root@mysql-keepalived-master ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   router_id master
}
vrrp_script check_run {
   script "/etc/keepalived/keepalived_chech_mysql.sh"
   interval 5
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 89
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.246.18/24
    }
    track_script {
        check_run
    }
}
===========================================================================
slave 192.168.246.163 配置
[root@mysql-keepalived-slave ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
[root@mysql-keepalived-slave ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   router_id backup
}
vrrp_script check_run {
   script "/etc/keepalived/keepalived_check_mysql.sh"
   interval 5
}

vrrp_instance VI_1 {
    state BACKUP
    nopreempt
    interface ens33
    virtual_router_id 89
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.246.18/24
    }
    track_script {
        check_run
    }
}


四、mysql状态检测脚本/root/keepalived_check_mysql.sh（两台MySQL同样的脚本）
版本一：简单使用：
[root@mysql-keepalived-master ~]# vim /etc/keepalived/keepalived_chech_mysql.sh
#!/bin/bash
/usr/bin/mysql -uroot -p'QianFeng@2019!' -e "show status" &>/dev/null 
if [ $? -ne 0 ] ;then 
#	service keepalived stop
	systemctl stop keepalived
fi
[root@mysql-keepalived-master ~]# chmod +x /etc/keepalived/keepalived_chech_mysql.sh
==========================================================================
两边均启动keepalived
方式一:
[root@mysql-keepalived-master ~]# systemctl restart keepalived
[root@mysql-keepalived-master ~]# systemctl enable keepalived
方式二:
# /etc/init.d/keepalived start
# /etc/init.d/keepalived start
# chkconfig --add keepalived
# chkconfig keepalived on
注意:在任意一台机器作为客户端。在测试的时候记得检查mysql用户的可不可以远程登录。
用客户端去连接测试
[root@client ~]# mysql -uroot -p -h 192.168.246.18
Enter password: 
MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| qf1                |
| test               |
+--------------------+
可以看到qf1库

停止节点1的mariadb服务，查看vip是否漂移
[root@mysql-keepalived-master ~]# systemctl stop mariadb
可以看到vip会漂移到节点2上面
再次用客户端去连接测试
[root@client ~]# mysql -uroot -p -h 192.168.246.18
Enter password: 
MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| qf2                |
| test               |
+--------------------+
可以看到qf1库