admin/docker-entrypoint.sh

#!/usr/bin/env bash

if [ ! -z "${APPNET}" ]; then
   echo "Initial nslookup ${HOSTNAME}.${APPNET}"
   nslookup ${HOSTNAME}.${APPNET}
   while [ $? -ne 0 ]; do
     echo "Waiting for ${HOSTNAME}.${APPNET} to become available"
     sleep 1
     nslookup ${HOSTNAME}.${APPNET}
   done
fi

exec "$@"