You're reading from Docker for Developers Develop and run your application with Docker containers using DevOps tools for continuous delivery

Product type Paperback

Published in Sep 2020

Publisher Packt

ISBN-13 9781789536058

Length 468 pages

Edition 1st Edition

Tools

Docker

Concepts

Containerization

Authors (3):

Richard Bullington-McGuire

Michael Schwartz

Andrew K. Dennis

Preface

1. Section 1: An Introduction to Docker – Containers and Local Development

2. Chapter 1: Introduction to Docker FREE CHAPTER

3. Chapter 2: Using VirtualBox and Docker Containers for Development

4. Chapter 3: Sharing Containers Using Docker Hub

5. Chapter 4: Composing Systems Using Containers

6. Section 2: Running Docker in Production

7. Chapter 5: Alternatives for Deploying and Running Containers in Production

8. Chapter 6: Deploying Applications with Docker Compose

9. Chapter 7: Continuous Deployment with Jenkins

10. Chapter 8: Deploying Docker Apps to Kubernetes

11. Chapter 9: Cloud-Native Continuous Deployment Using Spinnaker

12. Chapter 10: Monitoring Docker Using Prometheus, Grafana, and Jaeger

13. Chapter 11: Scaling and Load Testing Docker Applications

14. Section 3: Docker Security – Securing Your Containers

15. Chapter 12: Introduction to Container Security

16. Chapter 13: Docker Security Fundamentals and Best Practices

17. Chapter 14: Advanced Docker Security – Secrets, Secret Commands, Tagging, and Labels

18. Chapter 15: Scanning, Monitoring, and Using Third-Party Tools

19. Chapter 16: Conclusion – End of the Road, but not the Journey

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Using the liveness, readiness, and startup probes in Kubernetes

Kubernetes has multiple types of health checks, called probes, to ensure that the Docker containers it runs are in shape to process traffic. You can read about them in detail at https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/.

The types of probes deal with different concerns:

Liveness: Determines whether an application can process requests at all.
Readiness: Determines whether a container is ready to receive real traffic, especially if it depends on external resources that have to be reachable or connected.
Startup: Determines whether a container is ready to start taking the other two types of traffic, intended for slow-starting legacy applications to give them time to start. As these are mostly needed for legacy applications, we won't cover them in detail.

You can configure probes to execute commands inside a running container, perform...