virtual-ip/docker-entrypoint.sh

#!/bin/sh
#set -e

if [ -z ${vip} ]; then echo "IP isn't defined!!!"; exit 1; fi
if [ -z ${vin} ]; then echo "NetMASK isn't defined!!!"; exit 1; fi
if [ -z ${vif} ]; then echo "IF isn't defined!!!"; exit 1; fi

trap cleanup SIGTERM EXIT
  cleanup()
    {
      ip addr del ${vip}/${vin} dev ${vif}:vip
    }
    ip addr add ${vip}/${vin} brd + dev ${vif} label ${vif}:vip
exec "/tmp/check_ip.sh" "$@" &
wait