Class: AWS::AMI

Inherits:
Object
  • Object
show all
Defined in:
lib/aws_ami/ami.rb

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ AMI

name: AMI name region: aws region of the new AMI key_name: AWS EC2 ssh key name for accessing ec2 instance for debuging problems install_script: a script file can be run on the ec2 instance that is launched from base ami to install packages base_ami: a yml file describes base AMI used for building new AMI for each region timeout: Timeout for running install script, default 600 publish_to_account: publish the AMI to this account if need assume_yes: true for deleting stack when creating image failed



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# File 'lib/aws_ami/ami.rb', line 14

def initialize(options={})
  @name = options[:name] || raise("Must have a name for the AMI")
  @region = options[:region] || raise("Must specify aws region")
  @key_name = options[:key_name] || raise("Please specify aws ssh key name, so that you can debug problem when something goes wrong")
  @install_script = File.read(options[:install_script]) || raise("Must provide install packages script file")

  @base_ami = YAML.load(File.read(options[:base_ami]))[@region] || raise("Must provide base ami yml file for each region")

  @timeout = options[:timeout] || '600'
  @assume_yes = options[:assume_yes] || false
  @publish_to_account = options[:publish_to_account]
  @test = options[:test]
end

Instance Method Details

#build ⇒ Object 



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# File 'lib/aws_ami/ami.rb', line 28

def build
  stack = cloudformation.stacks.create("build-#{@name}-ami",
                                       load_formation,
                                       :disable_rollback => true,
                                       :parameters => {
                                         'Timeout' => @timeout,
                                         'KeyName' => @key_name,
                                         'InstallScript' => @install_script,
                                         "BaseAMI" => @base_ami
                                       })
  logger.info "creating stack for region #{@region}"
  begin
    wait_until_created(stack)
    instance_id = stack.resources['EC2Instance'].physical_resource_id
    instance = ec2.instances[instance_id]
    if @test
      puts "Build AMI Stack created"
      puts "EC2 instance dns name: #{instance.dns_name}, ip address: #{instance.ip_address}"
      puts "continue to create AMI Image? [y/n]"
      unless gets.strip == 'y'
        logger.info "delete stack and stop"
        stack.delete
        return
      end
      logger.info "continue to create image"
    end
    logger.info "creating image"
    image = instance.create_image(@name, :description => "Created at #{Time.now}")
    sleep 2 until image.exists?
    logger.info "image #{image.id} state: #{image.state}"
    sleep 5 until image.state != :pending
    if image.state == :failed
      raise "Create image failed"
    end

    logger.info "image created"
    logger.info "delete #{stack.name} stack"
    stack.delete
  rescue => e
    logger.error "Creating AMI failed #{e.message}"
    logger.error e.backtrace.join("\n")
    logger.info "delete #{stack.name}? [y/n]"
    if @assume_yes || gets.strip.downcase == 'y'
      logger.info 'delete stack'
      stack.delete
    else
      logger.info "left stack live"
    end
    raise e
  end
  if @publish_to_account
    logger.info "add permissions for #{@publish_to_account}"
    image.permissions.add(@publish_to_account.gsub(/-/, ''))
  end
  image.id.tap do |image_id|
    logger.info "Image #{@name}[#{image_id}] created"
  end
end