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3 Ways to Extend the Power of Kubernetes
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======
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The ability to extend Kubernetes is its secret superpower, said Chen Goldberg, Director of Engineering at Google, speaking at the recent [KubeCon + CloudNativeCon][1] in Austin.
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In the race to build tools that help engineers become more productive, Goldberg talked about how she once led a team that developed a platform that did just that. Despite the fact the platform initially worked, it was not extensible, and it was also difficult to modify.
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Fortunately, said Goldberg, Kubernetes suffers from neither of these problems. To begin with, Kubernetes is self-healing system, as it uses controllers that implement what is called a " _Reconciliation Loop._ " In a reconciliation loop, a controller observes the current state of the system and compares it to its desired state. Once it has established the difference between each of these two states, it works towards achieving the desired state. This makes Kubernetes well-adapted to dynamic environments.
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### 3 Ways to Extend Kubernetes
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Goldberg then explained that to build the controllers, you need resources, that is, you need to extend Kubernetes. There are three ways to do that and, from the most flexible (but also more difficult) to the easiest they are: using a Kube aggregator, using an API server builder, or creating a Custom Resource Definition (or CRD).
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The latter allows to extend Kubernetes' functionality even with minimal coding. To demonstrate how it is done, Goggle Software Engineer Anthony Yeh came on stage and showcased adding a stateful set to Kubernetes. (Stateful sets objects used to manage stateful applications, that is applications that need to store the state of the application, keeping track of, for example, a user's identity and their personal settings.) Using _catset_ , a CRD implemented in 100 lines of JavaScript in one single file, Yeh showed how you can add a stateful set to a Kubernetes deployment. A prior extension that was not a CRD, required 24 files and over 3,000 lines of code.
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Addressing the issue of reliability of CRDs, Goldberg said Kubernetes had started a certification program that allows companies to register and certify their extensions for the Kubernetes community. In one month over 30 companies had signed up for the program.
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Goldberg went on to explain how the extensibility of Kubernetes was a hot topic in this year's KubeCon, and how Google and IBM were building a platform to manage and secure microservices using CRDs. Or how some developers were bringing machine-learning to Kubernetes, and others were demonstrating open service broker and the consumption of services on hybrid settings.
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In conclusion, Goldberg said, extensibility is about empowerment. And, the extensibility of Kubernetes makes it a general purpose and easy to use platform for developers, which allows them to run any application.
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You can watch the entire video below:
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https://www.youtube.com/embed/1kjgwXP_N7A?enablejsapi=1
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--------------------------------------------------------------------------------
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via: https://www.linux.com/blog/event/kubecon/2018/2/3-ways-extend-power-kubernetes
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作者：[PAUL BROWN][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.linux.com/users/bro66
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[1]:http://events17.linuxfoundation.org/events/kubecon-and-cloudnativecon-north-america
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3种扩展 Kubernetes 能力的方式
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======
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Google 的工程总监 Chen Goldberg 在奥斯汀最近的[KubeCon 和 CloudNativeCon][1]上说，Kubernetes 的扩展能力是它的秘密武器。
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在建立帮助工程师提高工作效率的工具的竞赛中，Goldberg 谈到他曾经领导过一个开发这样一个平台的团队。尽管平台最初有用，但它无法扩展，并且修改也很困难。
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幸运的是，Goldberg 说，Kubernetes 没有这些问题。首先，Kubernetes 是一个自我修复系统，因为它使用的控制器实现了“_协调环_”（Reconciliation Loop）。在协调环中，控制器观察系统的当前状态并将其与所需状态进行比较。一旦它确定了这两个状态之间的差异，它就会努力实现所需的状态。这使得 Kubernetes 非常适合动态环境。
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### 3种扩展 Kubernetes 的方式
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Goldberg 然后解释说，要建立控制器，你需要资源，也就是说，你需要扩展 Kubernetes。有三种方法可以做到这一点，从最灵活（但也更困难）到最简单的是：使用 Kube 聚合器，使用 API 服务器构建器或创建自定义资源定义（或 CRD）。
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后者允许即使使用最少的编码来扩展 Kubernetes 的功能。为了演示它是如何完成的，Goggle 软件工程师 Anthony Yeh 出席并展示了为 Kubernetes 添加一个状态集。 （状态集对象用于管理有状态应用，即需要存储应用状态的程序，跟踪例如用户身份及其个人设置。）使用 _catset_，在一个 100 行 JavaScript 的文件中实现的 CRD，Yeh 展示了如何将状态集添加到 Kubernetes 部署中。之前的扩展不是 CRD，需要 24 个文件和 3000 多行代码。
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为解决 CRD 可靠性问题，Goldberg 表示，Kubernetes 已经启动了一项认证计划，允许公司在 Kubernetes 社区注册和认证其扩展。在一个月内，已有 30 多家公司报名参加该计划。
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Goldberg 继续解释 Kubernetes 的可扩展性如何成为今年 KubeCon 的热门话题，以及 Google 和 IBM 如何构建一个使用 CRD 管理和保护微服务的平台。或者一些开发人员如何将机器学习带入 Kubernetes，另外展示开放服务代理以及在混合设置上的服务消费。
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Goldberg 总结说，可扩展性是种增能。而且，Kubernetes 的可扩展性使其成为开发者的通用平台，并且易于使用，这使得他们可以运行任何应用程序。
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你可以在下面观看整个视频：
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https://www.youtube.com/embed/1kjgwXP_N7A?enablejsapi=1
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--------------------------------------------------------------------------------
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via: https://www.linux.com/blog/event/kubecon/2018/2/3-ways-extend-power-kubernetes
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作者：[PAUL BROWN][a]
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.linux.com/users/bro66
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[1]:http://events17.linuxfoundation.org/events/kubecon-and-cloudnativecon-north-america
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