Book Image

Learn Docker - Fundamentals of Docker 18.x

By : Dr. Gabriel N. Schenker
Book Image

Learn Docker - Fundamentals of Docker 18.x

By: Dr. Gabriel N. Schenker

Overview of this book

Docker containers have revolutionized the software supply chain in small and big enterprises. Never before has a new technology so rapidly penetrated the top 500 enterprises worldwide. Companies that embrace containers and containerize their traditional mission-critical applications have reported savings of at least 50% in total maintenance cost and a reduction of 90% (or more) of the time required to deploy new versions of those applications. Furthermore they are benefitting from increased security just by using containers as opposed to running applications outside containers. This book starts from scratch, introducing you to Docker fundamentals and setting up an environment to work with it. Then we delve into concepts such as Docker containers, Docker images, Docker Compose, and so on. We will also cover the concepts of deployment, orchestration, networking, and security. Furthermore, we explain Docker functionalities on public clouds such as AWS. By the end of this book, you will have hands-on experience working with Docker containers and orchestrators such as SwarmKit and Kubernetes.
Table of Contents (21 chapters)
Title Page
Packt Upsell
Contributors
Preface
Index

Questions


Please answer the following questions to assess your learning progress:

  1. Explain in a few short sentences what the role of a Kubernetes master is.
  2. List the elements that need to be present on each Kubernetes (worker) node.
  3. Yes or No: We cannot run individual containers in a Kubernetes cluster. 
  4. Explain the reason why containers of a pod can use localhost to communicate with each other.
  5. What is the purpose of the so-called pause container in a pod?
  6. Bob tells you: Our application consists of three Docker images: web, inventory, and db. Since we can run multiple containers in a Kubernetes pod, we are going to deploy all the services of our application in a single pod. List three to four reasons why this is a bad idea.
  7. Explain in your own words why we need Kubernetes ReplicaSets.
  8. Under which circumstances do we need Kubernetes deployments?
  9. List at least three types of Kubernetes services and explain their purposes and their differences.