keepalive例子

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keepalived

keepalive是保证web服务器24小时不宕机的机制
主和备服务器都装httpd服务
主服务器是1
从服务器是2
[root@master ~]# yum install -y httpd
[root@master ~]# echo 1 > /var/www/html/index.html
[root@backup ~]# yum install -y httpd
[root@backup ~]# echo 2 > /var/www/html/index.html
[root@backup ~]# service httpd start
[root@master ~]# service httpd start
主服务器
[root@master ~]# yum install -y keepalived
[root@master ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak //备份配置文件
[root@master ~]# vim /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 195 //主从认识用的id号主要用来让主从相互认识用的下面的密码也是用来相互认识的就像两个人的ID密码都一样时主从就相互认识了
    priority 100
    advert_int 1
    authentication {
        auth_type PASS //主从认识用的加密方法
        auth_pass 2222 //主从认识用的密码
    }
    virtual_ipaddress {
        172.16.18.122  //虚拟IP
    }
}

从服务器
[root@backup ~]# yum install -y keepalived
[root@backup ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
[root@backup ~]# vim /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 195
    priority 20
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 2222
    }
    virtual_ipaddress {
        172.16.18.122
    }
}
[root@master ~]# service keepalived restart
[root@backup ~]# service keepalived restart
测试
用其他机器访问虚拟IP地址
[root@localhost ~]# elinks 172.16.18.122 --dump
1
[root@master ~]# service network stop 主服务器网络停掉
再访问虚拟IP 从服务器开始工作
[root@localhost ~]# elinks 172.16.18.122 --dump
2

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