Docker and Docker Compose are pivotal tools in the realm of containerization. Below, we'll deep dive into Docker, Docker Compose, their configuration, and an example setup with a php-apache container.

Docker

What is Docker?

Docker is a platform for developing, shipping, and running applications in containers. A container packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another.

Key Concepts

• Image: A lightweight, stand-alone, executable software package that includes everything needed to run a piece of software, including the code, a runtime, system tools, libraries, and settings.
• Container: A runtime instance of an image.
• Dockerfile: A text document that contains all the commands a user could call on the command line to assemble an image.