[root@VM_0_5_centos shell]# cat keealived-90.sh
#!/bin/bash
yum -y install keepalived
rm -rf /etc/keepalived/keepalived.conf
cat>>/etc/keepalived/keepalived.conf<<\EOF
! Configuration File for keepalived
global_defs {
   router_id 10.0.0.41
   script_user root
   enable_script_security
}
vrrp_script chk_nginx {
    script "/etc/keepalived/check_port.sh 80"
    interval 2
    weight -30
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 251
    priority 90
    advert_int 1
    mcast_src_ip 10.0.0.41
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 11111111
    }
    track_script {
         chk_nginx
    }
    virtual_ipaddress {
        10.0.0.100
    }
}
EOF
cat>>/etc/keepalived/check_port.sh<<\EOF
CHK_PORT=$1
 if [ -n "$CHK_PORT" ];then
        PORT_PROCESS=`ss -lntp|grep $CHK_PORT|wc -l`
        if [ $PORT_PROCESS -eq 0 ];then
                echo "Port $CHK_PORT Is Not Used,End."
                systemctl stop keepalived.service
        fi
 else
        echo "Check Port Cant Be Empty!"
 fi
EOF
sed -i 's/KillMode=process/#KillMode=process/' /usr/lib/systemd/system/keepalived.service
systemctl  start keepalived.service