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

Persistent and Ephemeral Volumes

There are two types of volumes: persistent and ephemeral ones. What we have seen so far is persistent volumes, which are between the host and the container. To share the volume between containers, we use the --volumes-from option. This volume exists only as long as it is being used by a container. When the last container using the volume exits, the volume disappears. This type of volume can be passed from one container to the next but is not saved. These volumes are called ephemeral volumes.

Volumes can be used to share log files between the host and the container or between containers. It is much easier to share them on a volume with the host so that even if the container was removed for an error, we can still track the error by checking the log file on the host after the container's removal.

Another common use of volumes in practical microservices applications is sharing the code on a volume. The advantage of this practice is that you...