In this chapter, you have learned a massive amount of new stuff revolving around Docker's data handling including Docker image internals and running your own Docker Registry. We have also covered transient, node-local, and relocatable data storage and the associated volume management that you will need to effectively deploy your services in the cloud. Later we have spent some time covering the volume orchestration ecosystem to help you navigate the changing landscape of Docker volume drivers as things have been changing quickly in this space. As we got to the end, coverage of various pitfalls (like UID/GID issues) was included so that you can avoid them in your own deployments.

As we continue into the next chapter, we will cover cluster hardening and how to pass data between a large volume of services in an orderly fashion.