cap-multiserver-plugin.rb

require 'capistrano'
unless Capistrano::Configuration.respond_to?(:instance)
  abort "capistrano/ext/multiserver requires Capistrano 2"
end

# Example Usage:
# servers.define :app1,      'user@app1.servers', :port => 9999
# servers.define :app2,      'user@app2.servers', :port => 9999
# servers.define :db1,       'user@db1.servers',  :port => 9999
# servers.define :db2,       'user@db2.servers',  :port => 9999

module MultiServer
  def define(name, host, options={})
    options = {:roles => [:app, :web]}.merge(options)
    
    desc "Add #{name} to servers to perform subsequent tasks on"
    task(name) do
      options.delete(:roles).each do |r|
        role(r, host, options)
      end
    end
    
  end
end

Capistrano.plugin :servers, MultiServer