Keepalived构建双主MySQL

MySQL主主：http://blog.csdn.net/chengshiep/article/details/50943221

两台服务器
MySQL-master1（主）：192.168.2.202
MySQL-master2（备）：192.168.2.222
MySQL-VIP（虚拟ip）：192.168.2.201

MySQL-master1（主）

#修改防火墙设置
vi /etc/sysconfig/iptables
#加上
iptables -A INPUT -p vrrp -j ACCEPT
service iptables restart

#安装keepalived
cd /usr/local/src
tar zxvf keepalived-1.2.19.tar.gz
cd keepalived-1.2.19
./configure --prefix=/usr/local/keepalived --with-kernel-dir
make && make install

#复制keepalived脚本
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf

#设置keepalived开机启动脚本
chkconfig keepalived on

#修改配置脚本
vi /etc/keepalived/keepalived.conf
#内容如下
global_defs {
   #notification_email {
   # [email protected] 
   #}
   #notification_email_from [email protected]
   #smtp_server smtp.qq.com
   #smtp_connect_timeout 30
   router_id MySQL-ha
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.2.201
    }
}

virtual_server 192.168.2.201 3306 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    persistence_timeout 50
    protocol TCP

    real_server 192.168.2.202 3306 {
        weight 3
        notify_down /etc/rc.d/keepalived.sh
    TCP_CHECK {
           # 连接超时时间
           connect_timeout 10
           # 重连次数
           nb_get_retry 3
           # 重连间隔时间
           delay_before_retry 3
           # 健康检查端口
           connect_port 3306
        }
    }
}

#编写检测服务down后所要执行的脚本
vi /etc/rc.d/keepalived.sh
#内容如下
----------
#!/bin/sh
/etc/init.d/keepalived stop
----------

#或者内容如下
----------
#!/bin/bash

# 环境变量
PATH=/bin:/usr/bin:/sbin:/usr/sbin; export PATH

# 暂停5秒执行，防止数据库人工正常重启
sleep 5

# mysql_id(存活=1 死掉=0)
mysql_id=`ps -C mysqld --noheader |wc -l`

# 判断mysql_id若死掉，则重启mysql一次，若仍然无法启动mysql则杀掉keepaliaved进程实现VIP切换
if [ $mysql_id -eq 0 ];then
/etc/init.d/mysqld restart
sleep 5
if [ $mysql_id -eq 0 ];then
/etc/init.d/keepalived stop
fi
fi
----------

#启动keepalived
/etc/init.d/keepalived start

#查看连接状态
ps -aux | grep keepalived

#查看VIP信息
ip addr

#查看vrrp通信
tcpdump vrrp

#查看keepalived进程
ps -aux | grep keepalived

MySQL-master2（备）

#修改防火墙设置
vi /etc/sysconfig/iptables
#加上
iptables -A INPUT -p vrrp -j ACCEPT
service iptables restart

#安装keepalived
cd /usr/local/src
tar zxvf keepalived-1.2.19.tar.gz
cd keepalived-1.2.19
./configure --prefix=/usr/local/keepalived --with-kernel-dir
make && make install

#复制keepalived脚本
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf

#设置keepalived开机启动脚本
chkconfig keepalived on

#修改配置脚本
vi /etc/keepalived/keepalived.conf
#内容如下


----------


global_defs {
   #notification_email {
   #  [email protected]
   #}
   #notification_email_from [email protected]
   #smtp_server smtp.qq.com
   #smtp_connect_timeout 30
   router_id MySQL-ha
}

vrrp_instance VI_1 {
    state BACKUP
    interface em1 
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.2.201
    }
}

virtual_server 192.168.2.201 3306 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 50
    protocol TCP

    real_server 192.168.2.222 3306 {
        weight 1
        notify_down /etc/rc.d/keepalived.sh
        TCP_CHECK {
           connect_timeout 10
           nb_get_retry 3
           delay_before_retry 3
           connect_port 3306
        }
    }
}


----------


#编写检测服务down后所要执行的脚本
vi /etc/rc.d/keepalived.sh
#内容如下
----------
#!/bin/sh
/etc/init.d/keepalived stop
----------

#或者内容如下
----------
#!/bin/bash

# 环境变量
PATH=/bin:/usr/bin:/sbin:/usr/sbin; export PATH

# 暂停5秒执行，防止数据库人工正常重启
sleep 5

# mysql_id(存活=1 死掉=0)
mysql_id=`ps -C mysqld --noheader |wc -l`

# 判断mysql_id若死掉，则重启mysql一次，若仍然无法启动mysql则杀掉keepaliaved进程实现VIP切换
if [ $mysql_id -eq 0 ];then
/etc/init.d/mysqld restart
sleep 5
if [ $mysql_id -eq 0 ];then
/etc/init.d/keepalived stop
fi
fi
----------

#启动keepalived
/etc/init.d/keepalived start

#查看连接状态
ps -aux | grep keepalived

#查看VIP信息
ip addr

#查看vrrp通信
tcpdump vrrp

#查看keepalived进程
ps -aux | grep keepalived

其他命令

#设置开机启动
chkconfig mysqld on
chkconfig keepalived on

#查看连接状态
ps -aux | grep keepalived

#查看VIP信息
ip addr

#查看vrrp通信
tcpdump vrrp

#查看keepalived进程
ps -aux | grep keepalived

#注意两个数据库的用户名需要有一套相同的，用于vip链接

#主Keepalived故障重启，不希望抢占备keepalived，可以配置nopreempt属性
设置为不抢占 
注：这个配置只能设置在backup主机上，而且这个主机优先级要比另外一台高
advert_int 1
nopreempt