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O'Reilly Platform
book
Kubernetes即学即用(第二版)
by
Brendan Burns
,
Joe Beda
,
Kelsey Hightower
June 2021
Intermediate to advanced
300 pages
5h 4m
Chinese
China Electric Power Press Ltd.
Content preview from
Kubernetes即学即用(第二版)
226
|
第
16
章
16.1
扩展
Kubernetes
意味着什么
一般来说,
Kubernetes API
服务器的扩展有两种方式:第一,向集群添加新
功能;第二,限制并调整用户与集群交互的方式。集群管理员可以利用丰富
的插件生态系统,向集群添加其他服务和功能。请注意,扩展集群需要很高
的权限。你不应该将扩展集群的能力赋予任意用户或任意代码,因为扩展集
群需要集群管理员权限。甚至连集群管理员也应多加小心,在安装第三方工
具时请千万谨慎。某些扩展(例如准入控制器)可以查看集群创建的所有对象,
而且很容易沦为窃取机密或运行恶意代码的载体。此外,扩展集群会导致你
的集群与标准的
Kubernetes
不一致。运行多个集群时,很重要的一点是要维
持构建工具在各个集群之间的体验一致,其中也包括已安装的扩展。
16.2
可扩展点
扩展
Kubernetes
的方式有很多种,从自定义资源定义(
Custom Resource
Definition
,
CRD
)到容器网络接口(
Container Network Interface
,
CNI
)插件。
本章,我们将重点介绍通过添加新资源类型或准入控制器向
API
服务发送请
求的扩展。我们不讨论容器网络接口(
Container Network Interface
,
CNI
)、
容器存储接口(
Container Storage Interface
,
CSI
)和容器运行时接口(
Container
Runtime Interface
,
CRI
)扩展,因为这些都是
Kubernetes
集群提供商常用的
扩展方式,而非面向 ...
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Publisher Resources
ISBN: 9787519856762