daemons.rb

module Daemons
  class Base
    include SSH

    attr_accessor :server

    delegate :logger, :address, :to => :server

    class << self
      def inherited(klass)
        klass.instance_eval do
          cattr_accessor :path
        end
      end

      def has_path(path)
        self.path = path
      end
    end

    def initialize(server)
      @server = server
    end

    def reload
      exec(:reload)
    end

    def restart
      exec(:restart)
    end

    def exec(*args)
      ssh("c4sa", address, "sudo #{self.class.path} #{args}")
    end
  end

  class Nginx < Base
    has_path "/etc/init.d/nginx"
  end

  class Syslog < Base
    has_path "/etc/init.d/syslog-ng"
  end
end

server.rb

class Server < ActiveRecord::Base
  def nginx
    @nginx ||= Daemons::Nginx.new(self)
  end
end

ssh.rb

module SSH
  def ssh(user, host, command)
    ssh = "ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no #{user}@#{host} #{command}"
    logger.info(ssh)
    `#{ssh}` if Rails.env.production?
  end
end