记一次Nginx+Keepalived高可用故障转移

Posted 2021-01-10 夕颜@伤雨痕

 Master端：192.168.2.156

! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
     [e-mail]
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 192.168.2.156
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script check_nginx {
  script "/data/sh/check_nginx.sh"
  interval 2
  weight 2
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.2.100
    }
 track_script {
  check_nginx
}
}

 slave端:192.168.2.157

! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
     [e-mail]
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 192.168.2.156
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script check_nginx {
  script "/data/sh/check_nginx.sh"
  interval 2
  weight 2
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
   mcast_src_ip 192.168.2.157
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.2.100
    }

 track_script {
  check_nginx
}
}

 故障转移脚本

#vim  /data/sh/check_nginx.sh 

#!/bin/bash 
COUNT=$(ps -C nginx --no-header |wc -l)
if [ "${COUNT}"  =  "0" ];then
        echo "重启nginx"
        sleep 2
     COUNT=$(ps -C nginx --no-header |wc -l)
        if [ "${COUNT}" = "0" ];then
             systemctl  stop  keepalived
        fi
fi

 # chmod a+x /data/sh/check_nginx.sh 

[root@localhost ~]# crontab -e

*/1 * * * * /data/sh/check_nginx.sh >> /var/log/check_nginx.log

 测试：当我们尝试停止nghinx时，当手动停止nginx约2秒之后，此时会关闭keepalived，实现vip转移

浏览器访问浏览：VIP192.168.2.100即可