Keepalived安装及初步使用

一.基本规划
VIP:192.168.1.11
Master:192.168.1.105
Backup:192.168.1.102

二.安装
主备分别安装keepalived
yum -y install keepalived

三.Master配置
#vi /etc/keepalived/keepalived.conf

vrrp_instance VI_1 {
    state MASTER #主
    interface eth0 #监视网卡
    virtual_router_id 51 #主备保持一致
    priority 100 #权重,master大于backup
    advert_int 1 #组播信息发送间隔

    #验证,主备保持一致
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    #VIP
    virtual_ipaddress {
        192.168.1.111
    }

}

四.backup配置

#vi /etc/keepalived/keepalived.conf

vrrp_instance VI_1 {
    state MASTER #主
    interface eth0 #监视网卡
    virtual_router_id 51 #主备保持一致
    priority 90 #权重,master大于backup
    advert_int 1 #组播信息发送间隔

    #验证,主备保持一致
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    #VIP
    virtual_ipaddress {
        192.168.1.111
    }

}

五.测试
停止192.168.1.105上的keepavlied,vip自动漂移到192.168.1.102;启动192.168.1.105上的keepavlied,则复原

六.完善
停止掉192.168.1.105上的80服务,vip不会自动飘移,为解决该问题.我们在80服务停止时kill掉keepalived.

三.Master配置
#vi /etc/keepalived/keepalived.conf

vrrp_script check_nginx {
     script "/etc/keepalived/check_nginx.sh"
     interval 2
     weight 2
}

vrrp_instance VI_1 {
    state MASTER #主
    interface eth0 #监视网卡
    virtual_router_id 51 #主备保持一致
    priority 100 #权重,master大于backup
    advert_int 1 #组播信息发送间隔

    #验证,主备保持一致
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    #检测脚本
    track_script {
     check_nginx
     }

    #VIP
    virtual_ipaddress {
        192.168.1.111
    }

}

check_nginx.sh文件内容如下:

#!/bin/bash
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
 then
  killall -9  keepalived
fi