How to check whether my user data passing to EC2 instance working or not?

Question

While creating new AWS EC2 instance using EC2 command line API, i am passing some user data to new instance.

Now how i came to know whether that user data executed or no

Answer 1

Have your user data create a file in your ec2's /tmp directory to see if it works:

bob.txt:

#!/bin/sh
echo 'Woot!' > /home/ec2-user/user-script-output.txt

Then launch with:

ec2-run-instances -f bob.txt -t t1.micro -g ServerPolicy ami-05cf5c6d -v