For production Capistrano deploys, we can't use our own internal git server because the one off amazon box doesn't have access to the internal network. Hacked in a solution to create a port forward to talk back to our network. Works in this case so sharing.

production.rb

set :repo_url,  "ssh://git@localhost:9000/#{fetch(:application)}.git"

module SSHKit; module Backend
  class Netssh < Printer
    alias_method :orig_ssh, :ssh
    def ssh
      ret = orig_ssh
      @@created_remote ||= ret.forward.remote(22, 'gitserver', 9000)
      return ret
    end
  end
end; end

server 'amazonserver.amazonaws.com', roles: %w{app web db}, user: 'ec2-user'

I keep getting this error:

cap aborted!
undefined method 'ssh' for class 'SSHKit::Backend::Netssh'
config/deploy/production.rb:5:in 'alias_method'

Do you have any clue?