shell脚本死循环检查是否有特定的路由，若存在进行删除操作

while [ 1 ]

do
  tun0_route=`ip route |grep -ci "100.100.80.0"`

  if [ $tun0_route -eq 0 ];then

    echo "ip route for 100.100.80.0/24 via dev tun0 is not exist, it's normal status " >> /tmp/tun0_route.log

  else
    echo "ip route for 100.100.80.0/24 via dev tun0  is exist which cause k8s imagepullbackoff error , it would be deleted" 

    ip route delete  100.100.80.0/24  via 10.8.0.85

  fi

  sleep 60
done

　　

并加入开机启动 ：

[root@k8s-node01 home]# cat /etc/rc.local 

sh /home/tun0_route_monitor.sh & > /dev/null 2>&1