automounting EBS in EC2

# Courtesy
# http://ec2dream.blogspot.com/search/label/EBS

#!/usr/bin/ruby
require 'rubygems'
require 'right_aws'
require 'net/http'

url = 'http://169.254.169.254/2008-02-01/meta-data/instance-id'
instance_id = Net::HTTP.get_response(URI.parse(url)).body

AMAZON_PUBLIC_KEY=''
AMAZON_PRIVATE_KEY=''
url_user_data = 'http://169.254.169.254/2008-02-01/user-data'
ec2_vol = Net::HTTP.get_response(URI.parse(url_user_data)).body
print "auto mounting ",ec2_vol,"\n"

ec2 = RightAws::Ec2.new(AMAZON_PUBLIC_KEY, AMAZON_PRIVATE_KEY)

print "attach ",ec2_vol,"\n"
vol = ec2.attach_volume(ec2_vol, instance_id, '/dev/sdf')
puts vol

# It can take a few seconds for the volume to become ready.
# This is just to make sure it is ready before mounting it.
sleep 20
print "mount /dev/sdf /mnt/data01\n"
system('mkdir /mnt/data01')
system('mount /dev/sdf /mnt/data01')