self-spot

#!/bin/sh
# script that runs on the spot instance to watch itself.
# this provides a faster fail-over under normal scenarios.

if ! [ -f /etc/ec2spotter ]
then
	# safety check - I'm not the spot instance!
	exit 1
fi

PATH=/usr/local/bin/:$PATH

until curl -s http://169.254.169.254/latest/meta-data/spot/termination-time | grep -q .*T.*Z
do
	sleep 5
done

cd `dirname $0`
. ./$(hostname -s).conf || exit 1

controlId=$(cat /etc/ec2spotter)

echo "Self-spotted termination warning received for instance=$controlId eip=$ec2spotter_elastic_ip" >&2

# give back the public IP address to the control instance
aws ec2 associate-address --instance-id $controlId --allocation-id $ec2spotter_elastic_ip --allow-reassociation

# according to AWS documentation the termination could be cancelled
echo /sbin/poweroff | at now + 5 minutes