Wait for DNS to resolve, return IP #gcp #dns

wait-dns-ip.sh

#!/bin/bash
# Usage:
#   wait-dns-ip.sh <hostname>
#   eg: wait-dns-ip.sh host.foo.com
# 
# Will timeout after 5minutes (5 * 60 tries * 1 sec wait = 300 secs)
DNS_IP=""
COUNTER=0
while [ -z $DNS_IP ] && [ $COUNTER -lt 300 ]; do
  DNS_IP=$(nslookup $1.humanaedge.io | awk '/^Address: / { print $2 }')
  [ -z "$DNS_IP" ] && sleep 1
  ((COUNTER++))
done
[ -z "$DNS_IP" ] && echo "timeout" || echo $DNS_IP