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
｜
313
image: busybox
这个功能看上去非常好用并极大地提高了
CRD
的使用体验。并且，从
API
服
务器读出这些已经存放在
etcd
中的旧的对象也会自动继承这些新加的字段
注
3
。
注意，
etcd
中存储的对象本身并不会被修改（也就是说，不会自动迁移成新
版本的对象）。换句话说，默认值是读取对象时实时填充的，并只有在更新
对象时才会被重新持久化保存下来。
9.4
小结
准入和转换
Webhook
极大地增强了
CRD
的能力。在没有这些功能之前，
CR
通常只能在一些小规模的、非核心应用场景下使用，比如作为配置或内部的
应用，因为在这些场景下
API
的兼容性不是那么的重要。
有了
Webhook
，
CR
看起来就更近接于原生的资源了，它有了完整的生命周期
管理和强大的语义。我们已经学习了如何处理不同资源之间的依赖以及如何
为字段设置默认值。
至此，相信你已经对这些功能在
CRD
中的应用场景有了很多的想法。在未来
我们期待看到社区基于这些功能开发出各种创新的应用。
注
3
：
比如，通过
kubectl get ats -o yaml
获取该对象时。
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.