keepalived+MySQL主主高可用

一、环境介绍：

10.1.1.174:23316 M1
10.1.1.237:23316 M2

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二、配置双主：略。

三、keepalive安装

[root@master1 ~]# cd /usr/local/src/

[root@master1 src]# wget https://www.keepalived.org/software/keepalived-2.0.17.tar.gz

[root@master1 src]# tar -xf keepalived-2.0.17.tar.gz

[root@master1 src]# cd keepalived-2.0.17

[root@master1 keepalived-2.0.17]# yum install openssl* libnl‐dev* gcc-c++

[root@master1 keepalived-2.0.17]# ./configure --prefix=/usr/local/keepalived

[root@master1 keepalived-2.0.17]# make

[root@master1 keepalived-2.0.17]# make install

cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
echo "/etc/init.d/keepalived start" >> /etc/rc.local
mkdir -p  /etc/keepalived/
mv /etc/keepalived/keepalived.conf /root/keepalived.conf.bak

M1:keepalive配置文件：
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

vrrp_script chk_mysql_port {     #检测mysql服务是否在运行。有很多方式，比如进程，用脚本检测等等
    script "/etc/keepalived/chk_mysql.sh"   #这里通过脚本监测
    interval 2                   #脚本执行间隔，每2s检测一次
    weight -5                    #脚本结果导致的优先级变更，检测失败（脚本返回非0）则优先级 -5
    fall 2                    #检测连续2次失败才算确定是真失败。会用weight减少优先级（1-255之间）
    rise 1                    #检测1次成功就算成功。但不修改优先级
}

vrrp_instance VI_1 {
    state MASTER    
    interface ens192      #指定虚拟ip的网卡接口，改成你自己的 eth0或者其它什么的
   # mcast_src_ip 10.1.1.174
    virtual_router_id 51    #路由器标识，MASTER和BACKUP必须是一致的
    priority 101            #定义优先级，数字越大，优先级越高，在同一个vrrp_instance下，MASTER的优先级必须大于BACKUP的优先级。这样MASTER故障恢复后，就可以将VIP资源再次抢回来 
    unicast_src_ip  10.1.1.174 ##（本地IP地址）
    unicast_peer {
                  10.1.1.237 ##（对端IP地址）此地址一定不能忘记
                       }
    advert_int 1         
    authentication {   
        auth_type PASS 
        auth_pass 1111     
    }
    virtual_ipaddress {    
        10.1.1.111
    }

track_script {               
   chk_mysql_port             
}
}
[root@crm-db01 ~]# cat /etc/keepalived/chk_mysql.sh         #####注意可执行权限
#!/bin/bash
counter=$(netstat -na|grep "LISTEN"|grep "23316"|wc -l)
if [ "${counter}" -eq 0 ]; then
    /etc/init.d/keepalived stop
fi

M2：keepalived配置文件：
[root@#localhost keepalived]# cat keepalived.conf
! Configuration File for keepalived

vrrp_script chk_mysql_port {
    script "/etc/keepalived/chk_mysql.sh"
    interval 2
    weight -5
    fall 2
    rise 1
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens192             #指定虚拟ip的网卡接口，改成你自己的 eth0或者其它什么的        
    #mcast_src_ip 10.1.1.237
    virtual_router_id 51
    priority 90
    unicast_src_ip  10.1.1.237 ##（本地IP地址）
    unicast_peer {
                  10.1.1.174       ##（对端IP地址）此地址一定不能忘记
                       }
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.1.1.111
    }

track_script {
   chk_mysql_port
}
}

[root@#localhost keepalived]# cat chk_mysql.sh           #####注意可执行权限
#!/bin/bash
counter=$(netstat -na|grep "LISTEN"|grep "23316"|wc -l)
if [ "${counter}" -eq 0 ]; then
    /etc/init.d/keepalived stop
fi

启动keepalived服务
[root@master1 ~]# /etc/init.d/keepalived start
常用命令：
/etc/init.d/keepalived restart|start|stop
/etc/init.d/mysqld restart|start|stop
查看keepalive状态：
systemctl status keepalived.service
查看日志：
tail -f /var/log/messages

四、可能出现的问题：

1.启动两个keepalived ，两边都有VIP。
我这个配置文件已经修改过，应该不会出现这个情况。
2.VIP起来后，无法通过VIP访问MySQL数据库。
关闭防火墙或者开放相关端口。
查看你的MySQL配置文件，看看有没有这个参数#bind-address = 10.1.1.237，有的话注释掉，重启数据库。

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