July 2019
Intermediate to advanced
270 pages
6h 41m
English
Content preview from Programming Kubernetes
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Chapter 3. Basics of client-go
We’ll now focus on the Kubernetes programming interface in Go. You’ll learn how to access the Kubernetes API of the well-known native types like pods, services, and deployment. In later chapters, these techniques will be extended to user-defined types. Here, though, we first concentrate on all API objects that are shipped with every Kubernetes cluster.
The Repositories
The Kubernetes project provides a number of third-party consumable Git repositories under the kubernetes organization on GitHub. You’ll need to import all of these with the domain alias k8s.io/… (not github.com/kubernetes/…) into your project. We’ll present the most important of these repositories in the following sections.
The Client Library
The Kubernetes programming interface in Go mainly consists of the k8s.io/client-go library (for brevity we will just call it client-go going forward). client-go is a typical web service client library that supports all API types that are officially part of Kubernetes. It can be used to execute the usual REST verbs:
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Create
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Get
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List
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Update
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Delete
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Patch
Each of these REST verbs are implemented using the “The HTTP Interface of the API Server”. Furthermore, the verb Watch is supported, which is special for Kubernetes-like APIs, and one of the main differentiators compared to other APIs.
client-go is available on GitHub (see Figure 3-1), and used in Go code with the k8s.io/client-go package name. It is shipped in parallel to Kubernetes ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.