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

Questions

Please answer the following questions to assess your learning progress:

  1. Which statements are correct (multiple answers are possible)?

A. A container is kind of a lightweight VM
B. A container only runs on a Linux host
C. A container can only run one process
D. The main process in a container always has PID 1
E. A container is one or more processes encapsulated by Linux namespaces and restricted by cgroups

  1. In your own words, maybe by using analogies, explain what a container is.
  2. Why are containers considered to be a game-changer in IT? Name three or four reasons.
  3. What does it mean when we claim: If a container runs on a given platform, then it runs anywhere...? Name two to three reasons why this is true.
  4. Docker containers are only really useful for modern greenfield applications based on microservices. Please justify your answer.

A. True
B...