gistfile1.rb

require 'fog'
require 'ubuntu_ami'
require 'chef/knife/ec2_server_create'

# Here are some defaults
# TODO: accept command line options

REGION = "eu-west-1"
RELEASE = "lucid"
SECURITY_GROUP = "default"
FLAVOUR = "m1.small"
KEY = "gsg-opseng"
ZONE = "eu-west-1b"
EBS = nil

def select_hostname
  available_hosts = search(:hostnames, 'NOT status:TAKEN').map do |hostname|
    hostname['id']
  end

  return available_hosts[rand(available_hosts.size)]
end

def select_ami(release)
  ami_generator = UbuntuAmi.new(RELEASE)
  region = ami_generator.region_fix(REGION)
  size = "_" + FLAVOUR.split(".").last
  ebs = EBS ? "_ebs" : ""
  key = region + size + ebs
  return ami_generator.run[key]
end

connection = Fog::AWS::Compute.new(
  :aws_access_key_id => Chef::Config[:knife][:aws_access_key_id],
  :aws_secret_access_key => Chef::Config[:knife][:aws_secret_access_key],
  :region => REGION
)

server = connection.servers.create(
  :image_id => select_ami(RELEASE),
  :groups => [ SECURITY_GROUP ],
  :flavor_id => FLAVOUR,
  :key_name => KEY,
  :availability_zone => ZONE
)

puts "Instance ID: #{server.id}"
puts "Flavour: #{server.flavor_id}"
puts "Image: #{server.image_id}"
puts "Availability Zone: #{server.availability_zone}"
puts "Security Groups: #{server.groups.join(", ")}"
puts "SSH Key: #{server.key_name}"

print "\nWaiting for server"
server.wait_for { print "."; ready? }
puts("\n")

puts "Public DNS Name: #{server.dns_name}"
puts "Public IP Address: #{server.ip_address}"
puts "Private DNS Name: #{server.private_dns_name}"
puts "Private IP Address: #{server.private_ip_address}"

nodename = select_hostname

puts "Now bootstrap with the following command:"
puts "knife bootstrap #{server.ip_address} -N #{nodename}"