Book Image

Extending Docker

By : Russ McKendrick
Book Image

Extending Docker

By: Russ McKendrick

Overview of this book

With Docker, it is possible to get a lot of apps running on the same old servers, making it very easy to package and ship programs. The ability to extend Docker using plugins and load third-party plugins is incredible, and organizations can massively benefit from it. In this book, you will read about what first and third party tools are available to extend the functionality of your existing Docker installation and how to approach your next Docker infrastructure deployment. We will show you how to work with Docker plugins, install it, and cover its lifecycle. We also cover network and volume plugins, and you will find out how to build your own plugin. You’ll discover how to integrate it with Puppet, Ansible, Jenkins, Flocker, Rancher, Packer, and more with third-party plugins. Then, you’ll see how to use Schedulers such as Kubernetes and Amazon ECS. Finally, we’ll delve into security, troubleshooting, and best practices when extending Docker. By the end of this book, you will learn how to extend Docker and customize it based on your business requirements with the help of various tools and plugins.
Table of Contents (15 chapters)

Zero volumes

Before we look at volumes, let's look at what happens when you do not use any volumes at all and store everything directly on the containers.

To start with, let's create a new Docker instance called chapter03 locally using Docker Machine:

docker-machine create chapter03 --driver=virtualbox
eval $(docker-machine env chapter03)

Now that we have our machine, we can use Docker Compose to run through a scenario with WordPress. First of all, we will need to launch our WordPress containers, we are using the official WordPress and MySQL images from the Docker Hub as we did earlier, our docker-compose.yml file looks similar to the following code:

version: '2'
    container_name: my-wordpress-app
    image: wordpress
      - "80:80"
      - mysql
      WORDPRESS_DB_HOST: "mysql:3306"
      WORDPRESS_DB_PASSWORD: "password"
    container_name: my-wordpress-database
    image: mysql