Book Image

Mastering Docker, Fourth Edition - Fourth Edition

Book Image

Mastering Docker, Fourth Edition - Fourth Edition

Overview of this book

Docker has been a game changer when it comes to how modern applications are deployed and created. It has now grown into a key driver of innovation beyond system administration, with a significant impact on the world of web development. Mastering Docker shows you how you can ensure that you're keeping up with the innovations it's driving and be sure you're using it to its full potential. This fourth edition not only demonstrates how to use Docker more effectively but also helps you rethink and reimagine what you can achieve with it. You'll start by building, managing, and storing images along with exploring best practices for working with Docker confidently. Once you've got to grips with Docker security, the book covers essential concepts for extending and integrating Docker in new and innovative ways. You'll also learn how to take control of your containers efficiently using Docker Compose, Docker Swarm, and Kubernetes. By the end of this Docker book, you’ll have a broad yet detailed sense of what's possible with Docker and how seamlessly it fits in with a range of other platforms and tools.
Table of Contents (22 chapters)
Section 1: Getting Up and Running with Docker
Section 2: Clusters and Clouds
Section 3: Best Practices

Exploring Docker Compose commands

We are over halfway through the chapter, and the only Docker Compose command we have run is docker-compose up. If you have been following along and you run docker container ls -a, you will see something similar to the following Terminal screen:

Figure 5.8 – Output for docker container ls -a

As you can see, we have a lot of containers with the status of Exited. This is because when we used Ctrl + C to return to our Terminal, the Docker Compose containers were stopped.

Choose one of the Docker Compose applications and change to the folder that contains the docker-compose.yml file, and we will work through some more Docker Compose commands. I will be using the Example Vote application.

up and ps

The first command is docker-compose up, but this time, we will be adding a flag. In your chosen application folder, run the following:

$ docker-compose up -d

This will start your application back up, this time in...