You're reading from Certified Kubernetes Administrator (CKA) Exam Guide Validate your knowledge of Kubernetes and implement it in a real-life production environment

Product type Paperback

Published in Nov 2022

Publisher Packt

ISBN-13 9781803238265

Length 322 pages

Edition 1st Edition

Tools

Kubernetes

Concepts

DevOps

Author (1):

Mélony Qin

View More author details

Table of Contents (17) Chapters

Preface

1. Part 1: Cluster Architecture, Installation, and Configuration

2. Chapter 1: Kubernetes Overview FREE CHAPTER

3. Chapter 2: Installing and Configuring Kubernetes Clusters

4. Chapter 3: Maintaining Kubernetes Clusters

5. Part 2: Managing Kubernetes

6. Chapter 4: Application Scheduling and Lifecycle Management

7. Chapter 5: Demystifying Kubernetes Storage

8. Chapter 6: Securing Kubernetes

9. Chapter 7: Demystifying Kubernetes Networking

10. Part 3: Troubleshooting

11. Chapter 8: Monitoring and Logging Kubernetes Clusters and Applications

12. Chapter 9: Troubleshooting Cluster Components and Applications

13. Chapter 10: Troubleshooting Security and Networking

14. Index

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Appendix - Mock CKA scenario-based practice test resolutions

Configuring and leveraging CoreDNS

As mentioned earlier in this chapter, nodes, pods, and services are assigned their own IP addresses in the Kubernetes cluster. Kubernetes runs a Domain Name System (DNS) server implementation that maps the name of the service to its IP address via DNS records. So, you can reach out to the services with a consistent DNS name instead of using its IP address. This comes in very handy in the context of microservices. All microservices running in the current Kubernetes cluster can reference the service name to communicate with each other.

The DNS server mainly supports the following three types of DNS records, which are also the most common ones:

A or AAAA records for forward lookups that map a DNS name to an IP address. A record maps a DNS name to an IPv4 address, whereas an AAAA record allows mapping a DNS name to an IPv6 address.
SRV records for port lookups so that connections are established between a service and a hostname.