Send an email when an instance dies during cloud-init.

ec2-failed-instance-email.sh

#!/bin/bash

exec > >(tee /var/log/user-data.log|logger -it user-data -s 2>/dev/console) 2>&1

eval `ec2-tags -s -i`

/usr/sbin/sendmail -oi -t -f $EMAIL <<EOM
From: $EMAIL
To: $EMAIL
Subject: EC2 instance failure

This email message was generated on the following EC2 instance:

`ec2-tags -s -i | sort`

If the instance is still running, you can monitor the output of this
job using a command like:

  \$ ssh ec2-user@$EC2_LOCAL_IPV4 tail -1000f /var/log/user-data.log
  \$ ec2-describe-instances --region $AWS_DEFAULT_REGION $INSTANCE_ID

--
`cat /var/log/user-data.log 2>/dev/null`
--
`ps fax`
--

EOM