Chef_recipes.rb

# docker/recipes/setup.rb:

package "docker" do  
  package_name "lxc-docker-0.11.1"
  action :install
end  

# docker/recipes/kill_containers.rb:

script "kill_all_containers" do  
  interpreter "ruby"
  user "root"
  code <<-EOH
    `docker ps -q`.split("\n").each do |container_id|
      `docker stop \#{container_id}`
    end
    `docker ps -a -q`.split("\n").each do |container_id|
      `docker rm \#{container_id}`
    end
  EOH
end

# docker/recipes/myapp.rb: (one recipes for each container/application to run)

pull_and_run_app(:myapp)

# docker/libraries/common.rb:

def pull_image(name, image)
  script "pull_app_#{name}_image" do
    interpreter "bash"
    user "root"
    code <<-EOH
      docker pull #{image}
    EOH
  end
end

def run(name, image, cmdline, env)
  envs = env.map { |k, v|
    "-e #{k}=#{v}"
  }.join(" ")

  log "Docker environment: #{envs}"

  script "run_app_#{name}_container" do
    interpreter "bash"
    user "root"
    code <<-EOH
      docker run -d --name=#{name} #{envs} #{image} #{cmdline.join(" ")}
    EOH
  end
end

def pull_and_run_app(name)
  data = node[name]
  image = data[:image]
  pull_image(name, image)
  run(name, image, data[:cmdline], data[:env])
end