June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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93
第
4
章
使用自定义资源
在本章中，我们将向你介绍自定义资源（
Custom Resource
，
CR
），它是整个
Kubernetes
生态系统中最核心的扩展机制。
自定义资源可以用作系统内部使用的对象，仅仅对它进行声明式定义，而不
关联控制器逻辑，用于保存少量配置信息。但是自定义资源也可以成为很多
复杂
Kubernetes
项目的核心，用于提供原生
Kubernetes API
体验。这类服务
的例子有
Istio
、
Linkerd 2.0
和
AWS App Mesh
，它们的核心都是自定义资源。
还记得第
1
章中的例子吗？那个例子的核心就是一个这样的自定义资源：
apiVersion: cnat.programming-kubernetes.info/v1alpha1
kind: At
metadata:
name: example-at
spec:
schedule: "2019-07-03T02:00:00Z"
status:
phase: "pending"
从
1.7
版本开始，
Kubernetes
提供了自定义资源的功能。它们会与其他原生
Kubernetes API
资源存放在同一个
etcd
实例中，并由同一个
Kubernetes API
服务器提供服务。如图
4-1
所示，如果相关的资源不在下面的列表中，则会
94
｜
第
4
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