You're reading from The Ultimate Docker Container Book Build, test, ship, and run containers with Docker and Kubernetes

Product type Paperback

Published in Aug 2023

Publisher Packt

ISBN-13 9781804613986

Length 626 pages

Edition 3rd Edition

Tools

Docker

Concepts

DevOps

Author (1):

Dr. Gabriel N. Schenker

Preface

1. Part 1:Introduction

2. Chapter 1: What Are Containers and Why Should I Use Them? FREE CHAPTER

3. Chapter 2: Setting Up a Working Environment

4. Part 2:Containerization Fundamentals

5. Chapter 3: Mastering Containers

6. Chapter 4: Creating and Managing Container Images

7. Chapter 5: Data Volumes and Configuration

8. Chapter 6: Debugging Code Running in Containers

9. Chapter 7: Testing Applications Running in Containers

10. Chapter 8: Increasing Productivity with Docker Tips and Tricks

11. Part 3:Orchestration Fundamentals

12. Chapter 9: Learning about Distributed Application Architecture

13. Chapter 10: Using Single-Host Networking

14. Chapter 11: Managing Containers with Docker Compose

15. Chapter 12: Shipping Logs and Monitoring Containers

16. Chapter 13: Introducing Container Orchestration

17. Chapter 14: Introducing Docker Swarm

18. Chapter 15: Deploying and Running a Distributed Application on Docker Swarm

19. Part 4:Docker, Kubernetes, and the Cloud

20. Chapter 16: Introducing Kubernetes

21. Chapter 17: Deploying, Updating, and Securing an Application with Kubernetes

22. Chapter 18: Running a Containerized Application in the Cloud

23. Chapter 19: Monitoring and Troubleshooting an Application Running in Production

24. Index

25. Other Books You May Enjoy

Answers

Here are sample answers to the preceding questions:

Zero-downtime deployment means that a new version of a service in a distributed application is updated to a new version without the application needing to stop working. Usually, with Docker SwarmKit or Kubernetes (as we will see), this is done in a rolling fashion. A service consists of multiple instances and those are updated in batches so that the majority of the instances are up and running at all times.
By default, Docker SwarmKit uses a rolling updated strategy to achieve zero-downtime deployments.
Containers are self-contained units of deployment. If a new version of a service is deployed and does not work as expected, we (or the system) only need to roll back to the previous version. The previous version of the service is also deployed in the form of self-contained containers. Conceptually, there is no difference between rolling forward (an update) or backward (a rollback). One version of a container...