gistfile1.rb

namespace :admin do
  task :host01 => :environment do
    set :rails_env, :production
    set :deploy_to, '/home/admin/apps'
    set :domain, 'admin01'
  end

  task :host02 => :environment do
    set :rails_env, :production
    set :deploy_to, '/home/admin/apps'
    set :domain, 'admin02'
  end

  desc "Deploys the current version to the admin server."
  task :deploy do
    invoke :'admin:deploy_to_host01'
    invoke :'admin:deploy_to_host02'
  end

  task :deploy_to_host01 => :host01 do
    deploy do
      invoke :'git:clone'
      invoke :'deploy:link_shared_paths'
      invoke :'bundle:install'
      invoke :'rails:db_migrate'
      queue! %[bundle exec rake db:seed_fu]
      queue! %[bundle exec rake assets:precompile]

      to :launch do
        queue! %[./script/unicorn_admin_init.sh upgrade]
      end
    end
  end

  task :deploy_to_host02 => :host02 do
    deploy do
      invoke :'git:clone'
      invoke :'deploy:link_shared_paths'
      invoke :'bundle:install'

      to :launch do
        queue! %[./script/rapns.sh restart]
        queue! %[./script/resque_worker.sh restart]
      end
    end
  end
end

gistfile2.rb

namespace :admin do
  task :deploy do
    invoke :"admin01:deploy"
    run!
    invoke :"admin02:deploy"
  end
end

namespace :admin01 do
  task :host => :environment do
    set :rails_env, :production
    set :deploy_to, '/home/admin/apps'
    set :domain, 'admin01'
  end

  task :deploy => :host do
    deploy do
      invoke :'git:clone'
      invoke :'deploy:link_shared_paths'
      invoke :'bundle:install'
      invoke :'rails:db_migrate'
      queue! %[bundle exec rake db:seed_fu]
      queue! %[bundle exec rake assets:precompile]

      to :launch do
        queue! %[./script/unicorn_admin_init.sh upgrade]
      end
    end
  end
end

namespace :admin02 do
  task :host => :environment do
    set :rails_env, :production
    set :deploy_to, '/home/admin/apps'
    set :domain, 'admin02'
  end

  task :deploy => :host do
    deploy do
      invoke :'git:clone'
      invoke :'deploy:link_shared_paths'
      invoke :'bundle:install'

      to :launch do
        queue! %[./script/rapns.sh restart]
        queue! %[./script/resque_worker.sh restart]
      end
    end
  end
end