In this chapter, we covered a lot about the Docker Hub ecosystem. We discussed what official images are, how automated builds work, and of course, how to work with images in three different ways. After working through this chapter, we now have the tools in our tool belt to build our first application with Puppet.
In the next chapter, we will write our first Puppet module to create a Docker container and we will look at writing rspec-puppet unit tests to make sure that our module does what it's meant to do.