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

1. Running My First Docker Container

Activity 1.01: Pulling and Running the PostgreSQL Container Image from Docker Hub

Solution:

  1. To start the Postgres Docker container, first determine what environment variables are required to set the default username and password credentials for the database. Reading through the official Docker Hub page, you can see that you have configuration options for the POSTGRES_USER and POSTGRES_PASSWORD environment variables. Pass the environment variables using the -e flag. The final command to start our Postgres Docker container will be as follows:
    docker run -itd -e "POSTGRES_USER=panoramic" -e "POSTGRES_PASSWORD=trekking" postgres:12

    Running this command will start the container.

  2. Execute the docker ps command to verify that it is running and healthy:
    $ docker ps

    The command should return output like the following:

    CONTAINER ID  IMAGE         COMMAND                 CREATED
      STATUS              PORTS          ...