docker-image-testing-example

This is an exmaple of using Serverspec to test Dockerfiles

Setup

Install Serverspec and the require gems with bundler:

bundle install

This exmaple assumes you have Docker installed, running and configured.

Usage (running the tests)

bundle exec rake

The above will run Serverspec and using the docker-api gem it will

• Build a Docker image from the Docker file found in the top level dictrories (4.4 and 6.3)
• Create a container of that image,
• Run the tests found in spec/ on the container
• Delete the images and containers if the test was successful

The Dockerfiles are based on the offiial docker-node image.

You could also use the docker-api gem to pull exisiting images from the Docker hub and run tests against that image.

So for instance, a pull_image helper could look something like this:

  def pull_image(image)

    puts "Pulling image #{image}..."
    @image = Docker::Image.create('fromImage' => imge)

    set :os, :family => 'debian'
    set :backend, :docker
    set :docker_image, @image.id

    puts "Running tests..."
  end

Reference

• Documentation for Serverspec can be found at http://serverspec.org/resource_types.html
• Documentation for the docker-api gem can be found at /~https://github.com/swipely/docker-api