Script for running an ec2 instance based off a custom AMI, attaching an EBS volume, then associating an EIP

gistfile1.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'right_aws'
require 'net/ssh'
require 'open-uri'

# Git rid of ssl verification warning
class Net::HTTP
  alias_method :old_initialize, :initialize
  def initialize(*args)
    old_initialize(*args)
    @ssl_context = OpenSSL::SSL::SSLContext.new
    @ssl_context.verify_mode = OpenSSL::SSL::VERIFY_NONE
  end
end

AWS_ACCESS_KEY_ID="access key here"
AWS_SECRET_ACCESS_KEY="secret access key here"

@ec2 = RightAws::Ec2.new(AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY)
@image = @ec2.describe_images_by_owner.detect { |i| 
  i[:aws_location] == 'bucketname/imagename.manifest.xml' 
}
@volume = @ec2.describe_volumes.first

@instance = @ec2.launch_instances(
  @image[:aws_id], 
  :key_name => 'your-ssh-key-name', 
  :availability_zone => @volume[:zone]
).first
sleep(2) until (@instance = @ec2.describe_instances(
    @instance[:aws_instance_id]
  ).first
)[:aws_state] == 'running'

puts "Attaching volume..."
@ec2.attach_volume(@volume[:aws_id], @instance[:aws_instance_id], '/dev/sdh')
sleep(2) until @ec2.describe_volumes.detect { |v| 
  v[:aws_id] = @volume[:aws_id] 
}[:aws_attachment_status] == 'attached'

# These commented lines open and close firewall access to the instance from the current IP
# ip = open('http://checkip.dyndns.org').read.match(/(\d+\.?)+/)[0]
# @ec2.authorize_security_group_IP_ingress('default', 22, 22, 'tcp', "#{ip}/32")

sleep(2) # Sleep a bit more to give sshd a chance to wake up
Net::SSH.start(@instance[:dns_name], 'root', 
  :keys => [ 
    File.join(File.dirname(__FILE__), 
    'id_rsa-your-ssh-key-name')]) do |ssh|
    ssh.exec!("mount /srv")
    ssh.exec("/etc/init.d/postgresql-8.3 start")
  end

# @ec2.revoke_security_group_IP_ingress('default', 22, 22, 'tcp', "#{ip}/32")

puts "Assocating IP..."
@address = @ec2.describe_addresses.first
@ec2.associate_address(@instance[:aws_instance_id], @address[:public_ip])