CustomResourceDefinition简介
在 Kubernetes 中一切都可视为资源,Kubernetes 1.7 之后增加了对 CRD 自定义资源二次开发能力来扩展 Kubernetes API,通过 CRD 我们可以向 Kubernetes API 中增加新资源类型,而不需要修改 Kubernetes 源码来创建自定义的 API server,该功能大大提高了 Kubernetes 的扩展能力。
当你创建一个新的CustomResourceDefinition (CRD)时,Kubernetes API服务器将为你指定的每个版本创建一个新的RESTful资源路径,我们可以根据该api路径来创建一些我们自己定义的类型资源。CRD可以是命名空间的,也可以是集群范围的,由CRD的作用域(scpoe)字段中所指定的,与现有的内置对象一样,删除名称空间将删除该名称空间中的所有自定义对象。customresourcedefinition本身没有名称空间,所有名称空间都可以使用。
https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/
样例
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# resourcedefinition.yaml
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
# name must match the spec fields below, and be in the form: <plural>.<group>
name: crontabs.stable.example.com
spec:
# group name to use for REST API: /apis/<group>/<version>
group: stable.example.com
# list of versions supported by this CustomResourceDefinition
versions:
- name: v1
# Each version can be enabled/disabled by Served flag.
served: true
# One and only one version must be marked as the storage version.
storage: true
schema:
openAPIV3Schema:
type: object
properties:
spec:
type: object
properties:
cronSpec:
type: string
image:
type: string
replicas:
type: integer
# either Namespaced or Cluster
scope: Namespaced
names:
# plural name to be used in the URL: /apis/<group>/<version>/<plural>
plural: crontabs
# singular name to be used as an alias on the CLI and for display
singular: crontab
# kind is normally the CamelCased singular type. Your resource manifests use this.
kind: CronTab
# shortNames allow shorter string to match your resource on the CLI
shortNames:
- ct
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