Book Image

The Docker Workshop

By : Vincent Sesto, Onur Yılmaz, Sathsara Sarathchandra, Aric Renzo, Engy Fouda
5 (3)
Book Image

The Docker Workshop

5 (3)
By: Vincent Sesto, Onur Yılmaz, Sathsara Sarathchandra, Aric Renzo, Engy Fouda

Overview of this book

No doubt Docker Containers are the future of highly-scalable software systems and have cost and runtime efficient supporting infrastructure. But learning it might look complex as it comes with many technicalities. This is where The Docker Workshop will help you. Through this workshop, you’ll quickly learn how to work with containers and Docker with the help of practical activities.? The workshop starts with Docker containers, enabling you to understand how it works. You’ll run third party Docker images and also create your own images using Dockerfiles and multi-stage Dockerfiles. Next, you’ll create environments for Docker images, and expedite your deployment and testing process with Continuous Integration. Moving ahead, you’ll tap into interesting topics and learn how to implement production-ready environments using Docker Swarm. You’ll also apply best practices to secure Docker images and to ensure that production environments are running at maximum capacity. Towards the end, you’ll gather skills to successfully move Docker from development to testing, and then into production. While doing so, you’ll learn how to troubleshoot issues, clear up resource bottlenecks and optimize the performance of services. By the end of this workshop, you’ll be able to utilize Docker containers in real-world use cases.
Table of Contents (17 chapters)
Preface

Swarm Service Rolling Updates

Swarm also has the ability to perform rolling updates on the services that are running. This means if you have a new update to an application running on your Swarm, you can create a new Docker image and update your service, and Swarm will make sure the new image is up and running successfully before it brings down the old version of your container image.

Performing a rolling update on a service you have running in Swarm is simply a matter of running the service update command. In the following command, you can see both the new container image name and the service you want to update. Swarm will handle the rest:

docker service update --image <image_name:tag> <service_name>

You'll get the chance very shortly to use all the commands we've explained here. In the following example, you will create a small test application using Django and PostgreSQL. The web application you will be setting up is very basic, so there is no real...