June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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100
｜
第
4
章
注意，其中的有些字段在
CRD
创建后很久仍可能会发生变化。比如你可以
为这个资源添加一个短名或者一个新的字段。在这种情况下，
API
服务器仍
可以通过原来的名字为这个
CRD
提供服务，即使新旧名字间存在冲突。这
时
NamesAccepted
条件字段的状态为变成
False
，并且
spec
字段中的名字和
NamesAccepted
中体现的名字可能会是不同的。
4.3
自定义资源的高级功能
在这一节中，我们讨论自定义资源的一些高级功能，包括合法性验证和子资源。
4.3.1
自定义资源合法性验证
在创建和更新
CR
时，会由
API
服务器进行合法性验证，该验证基于
CRD
定
义中的
validation
字段所指定的
OpenAPI v3 Schema
进行。
当一个请求要创建或修改
CR
时，会基于这个资源定义对
JSON
格式的对象进
行合法性验证，如果有问题，会给用户返回
HTTP
400
，结果中包含发生冲突
的字段。从图
4-2
中可知，验证过程是由
apiextensions-apiserver
中的请
求处理器进行的。
如果需要更复杂的验证，可以通过实现准入
Webhook
来做到，
Webhook
可
以用图灵完备的编程语言来完成。从图
4-2
中可见，这些
Webhook
会在基于
OpenAPI
的验证逻辑完成后被立即调用。在“
9.2
准入
Webhook
”中，我们将
学习如何实现和部署准入
Webhook
。届时我们会看到如何去基于其他资源进
行验证，从而实现远远超越
OpenAPI v3
所能提供的验证功能。幸运的是，大
部分情况下，使用
OpenAPI ...
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