Capistrano Deploying into production on AWS using Fog and tags

deploy_cap_fog_tags.rb

require 'fog'

set :stage, :production

aws_settings={
  :provider=>"AWS",
  :aws_access_key_id=>ENV["AWS_ACCESS_KEY"],
  :aws_secret_access_key=>ENV["AWS_SECRET_KEY"]}
compute = Fog::Compute.new(aws_settings)

compute.servers.all.each do |server|
  role_tag=server.tags["role"].gsub(/\s+/, "_").downcase.to_sym
  if server.tags["role"] && server.state=="running"
    role role_tag, "ubuntu@#{server.dns_name}" 
  end
end