DigitalOcean Bash Script

gistfile1.sh

#!/bin/bash

export IP=$(curl -s http://169.254.169.254/metadata/v1/interfaces/public/0/ipv4/address)
export HOSTNAME=$(curl -s http://169.254.169.254/metadata/v1/hostname)
export LAST=${IP##*.}
HOSTNAME=${HOSTNAME/XXX/$LAST}
export HOST=${HOSTNAME%%.*}
export DOMAIN=${HOSTNAME/$HOST./}
sed -i "/HOSTNAME/c\HOSTNAME=${HOSTNAME}" /etc/sysconfig/network
sed -i "/127.0.0.1/a ${IP}\t${HOST}\t${HOSTNAME}\t${DOMAIN}" /etc/hosts

#cloud-config 
output: {all: '| tee -a /var/log/cloud-init-output.log'}