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

3. Managing Your Docker Images

Activity 3.01: Build Scripts Using Git Hash Versioning

Solution:

There are a variety of ways you could complete this activity. Here is one example:

  1. Create a new build script. The first line, showing the set –ex command, prints each step to the screen and will fail the script if any of the steps fail. Lines 3 and 4 set the variables for your registry and service names:
    1 set -ex
    2
    3 REGISTRY=dev.docker.local:5000
    4 SERVICENAME=postgresql
  2. In line 6, set the GIT_VERSION variable to point to your short Git commit hash. The build script then prints this value to the screen in line 7:
    6 GIT_VERSION=`git log -1 --format=%h`
    7 echo "version: $GIT_VERSION "
  3. Use the docker build command in line 9 to create your new image and add the docker push command in line 11 to push the image to your local Docker registry:
    9 docker build -t $REGISTRY/$SERVICENAME:$GIT_VERSION .
    10
    11 docker push ...