Deployment with Docker

Introduction to Docker containers

Docker containers, in essence, are a grouping of a number of filesystem layers that are stacked on top of each other in a sequence to create the final layout that is then run in an isolated environment by the host machine's kernel. Each layer describes which files have been added, modified, and/or deleted relative to its previous parent layer. For example, you have a base layer with a file /foo/bar, and the next layer adds a file /foo/baz. When the container starts, it will combine the layers in order and the resulting container will have both /foo/bar and /foo/baz. This process is repeated for any new layer to end up with a fully composed filesystem to run the specified service or services.

Think of the ...