June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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使用自定义资源
｜
97
}
这些逻辑都在服务发现的
RESTMapper
中实现。我们在“
3.5.3 REST
映射”中
已经见到过这种
RESTMapper
。
kubectl CLI
还在
~/.kube
目录中缓存了一份资源类型列表，所以它无须每次
都重新通过服务发现接口去获取信息。这个缓存有效期为
10
分钟。所以，
如果
CRD
如果发生变化，最多可能需要
10
分钟后才能在
CLI
中体现出来。
4.2
类型定义
下面让我们仔细看看
CRD
和它所提供的功能：在
cnat
的例子中我们了解到，
CRD
也是
Kubernetes
中的一种资源，从属于
apiextension.k8s.io/v1beta1
API
组，由
Kubernetes API
服务器进程中的
apiextensions-apiserver
提供
服务。
CRD
的
Schema
定义如下：
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: name
spec:
group: group name
version: version name
names:
kind: uppercase name
plural: lowercase plural name
singular: lowercase singular name # defaulted to be lowercase kind
shortNames: list of strings as short ...
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