keepalive高可用的健康检查

Master配置文件  注意iptables防火墙(见上个随笔)和健康检查脚本

keepalived 只是高可用，如果keepalived宕机后，ip会飘到备份主机，但是如果nginx掉了，keepalived是不会stop掉的，所以需要脚本做健康检查，代码如下：

! Configuration File for keepalived

global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}

notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id web1
}

vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh"
interval 2
weight -5
fall 2
rise 1
}

vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.120
}

track_script {
check_nginx
}
}

# virtual_router_id 51必须一致

脚本代码

#!/bin/bash
  A=$(ss -aunpt | grep nginx | wc -l)
        if [ $A -eq 0 ] ; then
              /usr/bin/kill -15 `cat /var/run/keepalived.pid`
              echo -e "keeplived is stoped"
        else
            exit 0
        fi

##注意脚本要加执行权限+x  vrrp_script 

 

注意关闭的keepalived关闭后，要起来，需要先启nginx，然后启keepalived

由于本人只有两台高可用，就不写备份机的代码和脚本了。