Ipscrambler.sh

#!/usr/bin/env bash
ip=$(hostname -I)
case $1 in
    'start' )
	apt-get install -y awscli
	SCHEDULE='*/10 * * * *' # every ten minutes
	(crontab -l 2> /dev/null; echo "$SCHEDULE $(pwd)/$(basename $0)") | crontab - ;;
    'stop' )
	crontab -l | grep -v $(basename $0) | crontab - ;;
    *)
	INSTANCE=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)
	OLD_IP=$(curl -s http://$ip/latest/meta-data/public-ipv4)
	NEW_IP=$(awk ec2 allocate-address --query PublicIp | tr -d '"')
	echo ''
	echo "Old IP: $OLD_IP"
	echo "New IP: $NEW_IP"
	echo ''
	echo 'Associating new IP...'
	aws ec2 associate-address --instance-id $INSTANCE --public-ip $NEW_IP
	echo 'Releasing old IP...'
	aws ec2 release-address --public-ip $OLD_IP
esac