June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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Kubernetes API
基础
｜
37
• Beta
级（比如
v2beta3
）通常默认是启用的，表示这里的功能都经过了必
要的测试。不过对象的语意在后续的其他
Beta
或正式版本中还可能发生
不兼容的变化。
• Stable
（普遍可用，
GA
）级（比如
v1
）出现在正式发布的软件版本中，
并会在后续很多版本中继续得到支持。
下面来看看
HTTP API
空间是如何构造的：顶层（即
/api/v1
的下一层）
用于区分不同的核心组，对于其他有名字的组，它们的顶层路径形式是
/apis/$NAME/$VERSION
。
核心组的
API
位于
/api/v1
，并不像很多人所想的那样位于
/apis/core/v1
，这
是有历史原因的，因为核心组
API
在引入
API
组的概念前就已经存在了。
还有第三类
HTTP
路径，它们与其他资源类型不同，是
API
服务器提供的一
些接口：集群级别的实体，比如
/metrics
、
/logs
或
/healthz
。除此之外，
API
服务器还提供
Watch
机制，用户可以在部分请求的后面加上
?watch=true
，
API
服务器会把这样的请求转换为
Watch
形式，这样就不需要每隔一段时间
就反复查询对象的状态了。
2.1.4
声明式状态管理
大部分
API
对象都区分资源的期望状态和当前状态。所谓规格（
Specification
，
简写为
Spec
）是对于某种资源的期望状态的完整描述，经常会被持久化到存
储系统中，通常是
etcd
。
为什么我们说“通常是
etcd
”？因为
Kubernetes
有很多发行版，比如
k3s
或
Microsoft ...
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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.