模拟129端服务出现问题

129端

[root@129 ~]# systemctl stop keepalived.service

130端

[root@130 ~]# systemctl start nginx.service
[root@130 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:e7:e8:44 brd ff:ff:ff:ff:ff:ff
    inet 192.168.118.130/24 brd 192.168.118.255 scope global dynamic noprefixroute ens33
       valid_lft 1117sec preferred_lft 1117sec
    inet 192.168.118.250/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fee7:e844/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
       
#访问测试
[root@130 ~]# curl 192.168.118.250
web111
[root@130 ~]# curl 192.168.118.250
web222
[root@130 ~]# curl 192.168.118.250
web111
[root@130 ~]# curl 192.168.118.250
web222

编写脚本

129端

[root@129 ~]# mkdir /scripts
[root@129 ~]# cd /scripts/
[root@129 scripts]# vim check_nginx.sh
#!/bin/bash
nginx_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bnginx\b'|wc -l)
if [ $nginx_status -lt 1 ];then
            systemctl stop keepalived
fi
[root@129 scripts]# vim notify.sh
#!/bin/bash
VIP=$2
case "$1" in
  master)
        nginx_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bnginx\b'|wc -l)
        if [ $nginx_status -lt 1 ];then
            systemctl start nginx
        fi
  ;;
  backup)
        nginx_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bnginx\b'|wc -l)
        if [ $nginx_status -gt 0 ];then
            systemctl stop nginx
        fi
  ;;
  *)
        echo "Usage:$0 master|backup VIP"
  ;;
esac
[root@129 scripts]# chmod +x check_nginx.sh
[root@129 scripts]# chmod +x notify.sh

130端

[root@130 ~]# mkdir /scripts
[root@130 ~]# cd /scripts/
[root@130 scripts]# scp root@192.168.118.130:/scripts/notify.sh .
[root@130 scripts]# ll
total 4
-rwxr-xr-x. 1 root root 451 Oct  8 19:17 notify.sh

配置keepalived加入监控脚本

129端

[root@130 ~]# vim /etc/keepalived/keepalived.conf 
! Configuration File for keepalived
 
global_defs {
   router_id lb01
}

vrrp_script nginx_check {		          #增加这一块
    script "/scripts/check_nginx.sh"
    interval 1
    weight -20
}

vrrp_instance VI_1 {
    state 129
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.118.250
    }
    track_script {		                  #还有这一部分
        nginx_check
    }
    notify_129 "/scripts/notify.sh 129 192.168.118.250"	
}
 
virtual_server 192.168.118.250 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP
 
    real_server 192.168.118.129 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
 
    real_server 192.168.118.130 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}
[root@130 ~]# systemctl restart keepalived.service 

130端
130端无需检测nginx是否正常，当升级为129时启动nginx，当降级为BACKUP时关闭