stopinator.rb

def ec2
  Fog::Compute.new(:provider => 'AWS',
                   :aws_secret_access_key => ENV['EC2_SECRET_KEY'],
                   :aws_access_key_id => ENV['EC2_ACCESS_KEY'])
end

def tenured? (instance)
  instance.created_at && (instance.created_at < Chronic.parse('50 minutes ago'))
end

def alive? (instance)
  instance.state == 'running' or instance.state == 'stopped'
end

zombies = ec2.servers.select { |i| i.tags.empty? && tenured?(i) && alive?(i) }
Parallel.each(zombies, :in_threads => 15) do |zombie|
  begin
    puts "Terminating zombie node #{zombie.id}"
    ec2.servers.get(zombie.id).destroy
  end
end