Linux container technologies, especially Docker, have grown in popularity in recent years, and this has continued since the last edition of this book was published. Containers provide a fast path to resource isolation, while maintaining consistency of the runtime environment. They can be launched quickly and are efficient to run, as there is very little overhead involved. Utilities such as Docker provide a lot of useful tooling for container management, such as a registry of images to use as the filesystem, tooling to build the images themselves, clustering orchestration, and so on. Through its ease of use, Docker has become one of the most popular ways to manage containers.
Ansible can interact with Docker in numerous ways as well. Notably, Ansible can be used to build images, to start or stop containers, to compose multiple container services...
