Book Image

Learn Docker - Fundamentals of Docker 19.x - Second Edition

By : Dr. Gabriel N. Schenker
Book Image

Learn Docker - Fundamentals of Docker 19.x - Second Edition

By: Dr. Gabriel N. Schenker

Overview of this book

Containers enable you to package an application with all the components it needs, such as libraries and other dependencies, and ship it as one package. Docker containers have revolutionized the software supply chain in both small and large enterprises. Starting with an introduction to Docker fundamentals and setting up an environment to work with it, you’ll delve into concepts such as Docker containers, Docker images, and Docker Compose. As you progress, the book will help you explore deployment, orchestration, networking, and security. Finally, you’ll get to grips with Docker functionalities on public clouds such as Amazon Web Services (AWS), Azure, and Google Cloud Platform (GCP), and learn about Docker Enterprise Edition features. Additionally, you’ll also discover the benefits of increased security with the use of containers. By the end of this Docker book, you’ll be able to build, ship, and run a containerized, highly distributed application on Docker Swarm or Kubernetes, running on-premises or in the cloud.
Table of Contents (25 chapters)
1
Section 1: Motivation and Getting Started
4
Section 2: Containerization, from Beginner to Black Belt
11
Section 3: Orchestration Fundamentals and Docker Swarm
18
Section 4: Docker, Kubernetes, and the Cloud

Chapter 7 

Here are some sample answers to the questions presented in this chapter:

  1. Pros and cons:
    • Pro: We don't need to have the particular shell, tool, or language required by the task installed on our host.
    • Pro: We can run on any Docker host, from Raspberry Pi to a mainframe computer; the only requirement is that the host can run containers.
    • Pro: After a successful run, the tool is removed without leaving any traces from the host when the container is removed.
    • Con: We need to have Docker installed on the host.
    • Con: The user needs to have a basic understanding of Docker containers.
    • Con: Use of the tool is a bit more indirect than when using it natively.
  2. Running tests in a container has the following advantages:
    • They run equally well on a developer machine than on a test or CI system.
    • It is easier to start each test run with the same initial conditions...