Class: ImageOptimize::ImageBundleEc2EBS

Inherits:
ImageBundleEc2Base show all
Defined in:
lib/image_bundle/image_bundle_ec2_ebs.rb

Overview

Handles the snapshoting and registration of EBS based images

Constant Summary

Constants inherited from ImageBundleEc2Base

ImageOptimize::ImageBundleEc2Base::RETRY_TIMEOUT_SEC

Instance Method Summary collapse

Methods inherited from ImageBundleEc2Base

#initialize, #register_image

Methods inherited from ImageBundleBase

#add_image_to_next_instance, #initialize, #log, #register_image

Methods included from Command

#debug, #execute

Methods included from Common

#not_implemented

Constructor Details

This class inherits a constructor from ImageOptimize::ImageBundleEc2Base

Instance Method Details

#register_command(name = nil, description = nil) ⇒ Object 



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# File 'lib/image_bundle/image_bundle_ec2_ebs.rb', line 64

def register_command(name=nil, description=nil)
  unless @snapshot_id
    fail("@snapshot_id cannot be nil. Be sure to run snapshot_instance first.")
  end

  # use ec2 tools to register snapshot as an image
  # TODO: this command only maps in 4 ephemeral devices to the new image. Use metadata to get actual count.
  cmd = "ec2-register --region #{region} --snapshot #{@snapshot_id} --description '#{@image_description}' --block-device-mapping '/dev/sdb=ephemeral0' --block-device-mapping '/dev/sdc=ephemeral1' --block-device-mapping '/dev/sdd=ephemeral2' --block-device-mapping '/dev/sde=ephemeral3' --kernel #{kernel_aki} --root-device-name #{@attachment_device} --architecture x86_64 --name '#{name}' #{common_options}"
  cmd
end

#snapshot_instance(name = nil, description = nil) ⇒ Object 



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# File 'lib/image_bundle/image_bundle_ec2_ebs.rb', line 25

def snapshot_instance(name=nil, description=nil)

  # find root volume
  #
  root_volume = nil
  begin
    device_name = "/dev/sda"
    @log.info "Locating root volume attached to #{device_name}..."
    attachment = instance.volume_attachments.index.select { |va| va.device =~ /#{device_name}/ }.first
    root_volume = attachment.volume
    @attachment_device = attachment.device
    @log.info "Found volume #{root_volume.show.name} attached at #{@attachment_device}"
  rescue Exception => e
    fail("FATAL: cannot find root volume. Check device_name which can vary depending on hypervisor and/or kernel. Also instance-store images not currently supported.", e)
  end

  # create snapshot
  @log.info "Creating snapshot of server."
  options = { :parent_volume_href => root_volume.href }
  options.merge!(:name => name) if name
  options.merge!(:description => description) if description
  snapshot = @instance_client.volume_snapshots.create(:volume_snapshot => options)
  @log.info "Snapshot name '#{name}'" if name

  # wait for snapshot to complete
  @log.info "Waiting for snapshot to become available"
  current_state = snapshot.show.state
  delay_sec = 10
  Timeout::timeout(RETRY_TIMEOUT_SEC) do
    while current_state != "available" do
      @log.info "  snapshot state: #{current_state}. try again in #{delay_sec} seconds..."
      sleep delay_sec
      current_state = snapshot.show.state
    end
  end
  @log.info "Snapshot is now available"
  @snapshot_id = snapshot.show.resource_uid
end