In the fourth and final (phew!) part of my guide to Docker, we'll be meeting Docker Compose, which is the smart way to run multi-container apps and gives us greater control over them.

Welcome to part three of my four-part guide to Docker, where we're building a PHP-based to-do app. This time out we'll look at multi-container apps and introduce a second, MySQL container to store our data!

In this, the second part of my Docker tutorial, we'll be building a PHP-based to-do app. Along the way we'll meet some new Docker concepts, including volumes, which are the key to developing within Docker.