【keepalived】keepalived service check script

一、实验环境

操作系统： CentOS7.5 Minimal

serverA： 192.18.1.101

serverB： 192.168.1.102

vip： 192.168.1.110

一、关闭selinux

# setenforce 0

# sed -i 's/^SELINUX=.*/SELINUX=permissive/g'  /etc/selinux/config

二、 设置 防火墙

firewalld和iptables二选一

三、配置serverA

# vim  /etc/keepalived/keepalived.conf

###################################

! Configuration File for keepalived

global_defs {

  router_id LVS_DEVEL

}

vrrp_script check {

script "/etc/keepalived/check_nginx.sh"

    interval 2

    fail 2

    rise 2

} 

vrrp_instance VI_1 {

    state BACKUP

    interface eno16777736

    virtual_router_id 125

    priority 100

    advert_int 1

    nopreempt

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    track_script { 

      check

    } 

    virtual_ipaddress {

        192.168.1.110/24  dev  eno16777736

    }

}

#######################################

四、配置serverB

# vim  /etc/keepalived/keepalived.conf

#######################################

! Configuration File for keepalived

global_defs {

  router_id LVS_DEVEL

}

vrrp_script check {

    script "/etc/keepalived/check_nginx.sh"

    interval 2

    fail 2

    rise 2

} 

vrrp_instance VI_1 {

    state BACKUP

    interface eno16777736

    virtual_router_id 125

    priority 90

    advert_int 1

    nopreempt

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    track_script { 

      check

    } 

    virtual_ipaddress {

192.168.1.110/24  dev eno16777736

    }

}

########################################

# chmod 750  /etc/keepalived/check_nginx.sh

#  cat  /etc/keepalived/check_nginx.sh

########################################

#!/bin/bash

nginx_count1=$(ps -C nginx --no-heading|wc -l)

if [ $nginx_count1 -eq 0 ];then

  systemctl start nginx

  nginx_count2=$(ps -C nginx --no-heading|wc -l)

  if [ $nginx_count2 -gt 0 ];then

    exit 0

else

  exit 1

fi

fi

exit 0

##############################################

五、参考

Keepalived Check and Notify Scripts

https://tobru.ch/keepalived-check-and-notify-scripts

https://serverfault.com/questions/718132/keepalived-vrrp-script-not-failing-over

https://e-mc2.net/keepalived-documentation-nightmare

https://docs.oracle.com/cd/E37670_01/E41138/html/section_hxz_zdw_pr.html