Issues with deploying with Capistrano

Issues with deploying with Capistrano

I'm having trouble deploying my Rails app with Capistrano. I keep getting
the connection failed for ec2_domain error.
* 2013-08-24 19:50:51 executing `deploy:setup'
* executing "mkdir -p /home/ubuntu/www/crowdcode
/home/ubuntu/www/crowdcode/releases /home/ubuntu/www/crowdcode/shared
/home/ubuntu/www/crowdcode/shared/system
/home/ubuntu/www/crowdcode/shared/log
/home/ubuntu/www/crowdcode/shared/pids"
servers: [ec2_domain]
connection failed for: ec2_domain (SocketError: getaddrinfo: Name or
service not known)
Here's what's inside of my deploy.rb file.
require "bundler/capistrano"
#set :application, "set your application name here"
set :repository, "https://github.com/path/to/code.git"
set :scm, :git
set :branch, "master"
set :user, "ubuntu"
set :use_sudo, false
set :deploy_to, "/home/ubuntu/www/crowdcode"
# set :scm, :git # You can set :scm explicitly or Capistrano will make an
intelligent guess based on known version control directory names
# Or: `accurev`, `bzr`, `cvs`, `darcs`, `git`, `mercurial`, `perforce`,
`subversion` or `none`
role :web, ec2_domain # Your HTTP server, Apache/etc
role :app, ec2_domain # This may be the same as
your `Web` server
role :db, ec2_domain, :primary => true # This is where Rails migrations
will run
#role :db, "your slave db-server here"
# if you want to clean up old releases on each deploy uncomment this:
# after "deploy:restart", "deploy:cleanup"
# if you're still using the script/reaper helper you will need
# these http://github.com/rails/irs_process_scripts
# If you are using Passenger mod_rails uncomment this:
namespace :deploy do
task :start do ; end
task :stop do ; end
task :restart, :roles => :app, :except => { :no_release => true } do
run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}"
end
end
ssh_options[:keys] = ["/home/ubuntu/.ssh/first_pair.pem"]
ssh_options[:forward_agent] = true
I'm not sure what's causing this error. I've looked at a few tutorials but
can't seem to fix the error. Anyone have an idea as to what the issue
could be?