June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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68
｜
第
3
章
3.2.3
规格与状态
最后，几乎所有的顶级对象都包含
spec
和
status
字段。这主要来源于
Kubernetes
的声明式
API
设计：
spec
是用户期望的对象状态，
status
是这种
期望带来的当前结果，
status
字段的值通常由系统中的控制器负责填充。参
考“
1.4
控制器和
Operator
”了解更多
Kubernetes
中控制器相关的信息。
Kubernetes
系统中只有很少对象不是按上述的方式来使用
spec
和
status
的，
比如核心组中的
Endpoint
，或者
ClusterRole
这样的
RBAC
对象。
3.3
客户端集合
在“
3.1.4
创建并使用客户端对象”的例子中，我们看到
kubernetes.
NewForConfig(config)
会返回一个客户端集合。一个客户端集合可以让客户
端访问多个
API
组和资源。
k8s.io/client-go/kubernetes
中的
kubernetes.
NewForConfig(config)
所返回的客户端集合可以用于访问
k8s.io.api
中定义的
所有
API
组和资源，包括
Kubernetes API
服务器提供的几乎所有资源，除了
APIServices
（用于聚合服务器）和
CustomeResourceDefinition
（见第
4
章“ 使
用自定义资源”）等少量例外情况。
在第
5
章“自动代码生成”中，我们将解释这些客户端集合是如何根据对
应
API
类型（在这个例子中就是
k8s.io/api
）生成出来的。第三方使用自
定义
API
的项目可能会需要比
Kubernetes ...
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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.