稼働中のインスタンスからnorebootでAMIを作成するスクリプト。

create_ami.rb

require "aws-sdk"

REGION   = ENV['REGION']
ELB_NAME = ENV['ELB_NAME']
IMAGE_NAME_PREFIX = ENV['IMAGE_NAME_PREFIX']

ec2 = AWS::EC2.new(region: REGION)
elb = AWS::ELB.new(region: REGION).load_balancers[ELB_NAME]
instance = elb.instances.first

puts "Create image of #{instance.id}"
(puts "No such instance: #{instance.id}"; exit(1)) unless instance.exists?

# Create new image
image_name = "#{IMAGE_NAME_PREFIX}-#{Time.now.strftime("%Y%m%d%H%M%S")}"
image_desc = "Backup image(#{instance.tags['Name']}) at #{DateTime.now}"
new_image = instance.create_image(image_name, {description: image_desc, no_reboot: true})
new_image.tags[:Name] = image_name

# wait for complete
puts "waiting for new image: #{new_image.name}(#{new_image.id})"
while true
  print('.'); sleep 1
  break if new_image.state != :pending
end
puts

(puts "create image failed: #{new_image.state_reason}"; exit(1)) if new_image.state == :failure
puts "create image successed"

# Add snapshot name
match = /Created by CreateImage\(#{instance.id}\) for #{new_image.id}/
snapshot = ec2.snapshots.find{|s| s.description =~ match }
snapshot.tag("Name", value: image_name)
puts "Added 'Name' tag to snapshot: #{snapshot.id}"