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The Kubernetes Workshop

You're reading from  The Kubernetes Workshop

Product type Book
Published in Sep 2020
Publisher Packt
ISBN-13 9781838820756
Pages 780 pages
Edition 1st Edition
Languages
Authors (6):
Zachary Arnold Zachary Arnold
Profile icon Zachary Arnold
Sahil Dua Sahil Dua
Profile icon Sahil Dua
Wei Huang Wei Huang
Profile icon Wei Huang
Faisal Masood Faisal Masood
Profile icon Faisal Masood
Mélony Qin Mélony Qin
Profile icon Mélony Qin
Mohammed Abu Taleb Mohammed Abu Taleb
Profile icon Mohammed Abu Taleb
View More author details

Table of Contents (20) Chapters

Preface
1. Introduction to Kubernetes and Containers 2. An Overview of Kubernetes 3. kubectl – Kubernetes Command Center 4. How to Communicate with Kubernetes (API Server) 5. Pods 6. Labels and Annotations 7. Kubernetes Controllers 8. Service Discovery 9. Storing and Reading Data on Disk 10. ConfigMaps and Secrets 11. Build Your Own HA Cluster 12. Your Application and HA 13. Runtime and Network Security in Kubernetes 14. Running Stateful Components in Kubernetes 15. Monitoring and Autoscaling in Kubernetes 16. Kubernetes Admission Controllers 17. Advanced Scheduling in Kubernetes 18. Upgrading Your Cluster without Downtime 19. Custom Resource Definitions in Kubernetes

The Kubernetes API Server

In Kubernetes, all communications and operations between the control plane components and external clients, such as kubectl, are translated into RESTful API calls that are handled by the API server. Effectively, the API server is a RESTful web application that processes RESTful API calls over HTTP to store and update API objects in the etcd datastore.

The API server is also a frontend component that acts as a gateway to and from the outside world, which is accessed by all clients, such as the kubectl command-line tool. Even the cluster components in the control plane interact with each other only through the API server. Additionally, it is the only component that interacts directly with the etcd datastore. Since the API server is the only way for clients to access the cluster, it must be properly configured to be accessible by clients. You will usually see the API server implemented as kube-apiserver.

Note

We will explain the RESTful API in more detail...

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