Docker Deployer

deployer.rb

class Deployer
  attr_accessor :current_id
  attr_reader :image

  def initalize(image)
    @image = image
  end

  def start
    self.current_id = run "docker run #{image}"
  end
  
  def stop
    run "docker stop #{current_id}"
  end
  
  def pull
    run "docker pull #{image}"
  end
  
  def deploy
    pull
    stop
    start
  end
end

deployer = Deployer.new("lmars/app")

deployer.start

trap("USR2") { deployer.deploy }