June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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自定义资源进阶
｜
291
API服务器
资源处理器
解码
请求数据版本转换
与默认值设置
准入
验证
REST逻辑
存储数据
版本转换与
默认值设置
结果版本转换
编码
变更
Webhook
验证
Webhook
图
9
-
5
：CR 请求流程中的准入控制
在“
4.3.1
自定义资源合法性验证”中我们了解到，
CRD
的验证是基于
OpenAPI
来实现的。在图
9-5
中，验证是通过一个标有“验证”的步骤来完成的。
验证准入
Webhook
就在那以后被调用，在调用变更准入
Webhook
之前。
准入
Webhook
的调用时机在准入插件处理链的尾部，在限额插件之前。准入
Webhook
在
Kubernetes 1.14
中是
Beta
功能，所以在大部分集群中都可以使用。
在
v1
版本的准入
Webhook API
中，计划要支持允许在准入插件处理链中
最多调用两次。这就意味着在某种程度上允许一个排在前面的准入插件或
Webhook
依赖后续的插件或
Webhook
的输出。所以在未来这个功能会变得
更强大。
9.2.1
餐馆示例中的准入需求
在餐馆的示例中，我们使用准入来实现下列功能：
• spec.toppings
如果是
nil
值或空值，则将其默认值设为：
mozzarella
、
tomato
和
salami
。
• CR
的
JSON
中不能被识别的字段会被丢弃，并不会被持久化到
etcd
中。
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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.