As you already know, Docker containers provide great flexibility for running Java services packaged into small, independent pieces of software. Docker containers make components of your application portable--you can move individual services across different environments without needing to worry about the dependencies or the underlying operating system. As long as the operating system is able to run the Docker engine, your Java containers can run on this system.

Also, as you remember from Chapter 1, Introduction to Docker, the Docker concept of isolating containers is far from the traditional virtualization. The difference is that Docker containers utilize the resources of the host operating system--they are light, fast, and easy to spin up. It's all very nice, but there are some risks. Your application consists of multiple, independent microservices...