Create EC2 Image (AMI) of running instances

create_ec2_image.rb

require 'aws-sdk'

def main
  ec2 = AWS::EC2.new
  ec2.regions.each do |r|
    puts "# region: #{r.name}"
    r.instances.each do |i|
      puts "## instance: #{i.id} #{i.tags[:Name]}"
      if i.status != :running
        puts "- [skipped] name: #{i.tags[:Name]} because it's not running."
        next
      end

      name = "#{Time.now.strftime('%Y%m%d%H%M')}-#{i.tags[:Name].gsub(/\s+/, '-')}-#{i.id}"
      desc = "AMI of #{i.id}, #{i.tags[:Name]} at #{Time.now}"

      puts "- [begin to create AMI] #{name} at #{Time.now}"

      # NOTE: `no_reboot` should be set false for data integrity                                                                                                                                                                       
      i.create_image(name, { description: desc, no_reboot: false})

      puts "- [finished] #{name} at #{Time.now}"
    end
  end
end

main