选题: KRS: A new tool for gathering Kubernetes resource statistics

2024-12-29 21:41:00 +08:00 · 2018-11-02 12:49:23 +08:00 · 2018-11-02 12:49:23 +08:00 · bb903760a5
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+KRS: A new tool for gathering Kubernetes resource statistics
+======
+Zero-configuration tool simplifies gathering information, such as how many pods are running in a certain namespace.
+![](https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/tools_hardware_purple.png?itok=3NdVoYhl)
+
+Recently I was in New York giving a talk at O'Reilly Velocity on the topic of [troubleshooting Kubernetes apps][1] and, motivated by the positive feedback and great discussions on the topic, I decided to revisit tooling in the space. It turns out that, besides [kubernetes-incubator/spartakus][2] and [kubernetes/kube-state-metrics][3], we don't really have much lightweight tooling available to collect resource stats (such as the number of pods or services in a namespace). So, I sat down on my way home and started coding on a little tool—creatively named **krs** , which is short for Kubernetes Resource Stats—that allows you to gather these stats.
+
+You can use [mhausenblas/krs][5] in two ways:
+
+  * directly from the command line (binaries for Linux, Windows, and MacOS are available); and
+  * in cluster, as a deployment, using the [launch.sh][4] script, which creates the appropriate role-based access control (RBAC) permissions on the fly.
+
+
+
+Mind you, it's very early days, and this is heavily a work in progress. However, the 0.1 release of **krs** offers the following features:
+
+  * In a per-namespace basis, it periodically gathers resource stats (supporting pods, deployments, and services).
+  * It exposes these stats as metrics in the [OpenMetrics format][6].
+  * It can be used directly via binaries or in a containerized setup with all dependencies included.
+
+
+
+In its current form, you need to have **kubectl** installed and configured for **krs** to work, because **krs** relies on a **kubectl get all** command to be executed to gather the stats. (On the other hand, who's using Kubernetes and doesn't have **kubectl** installed?)
+
+Using **krs** is simple; [Download][7] the binary for your platform and execute it like this:
+
+```
+$ krs thenamespacetowatch
+# HELP pods Number of pods in any state, for example running
+# TYPE pods gauge
+pods{namespace="thenamespacetowatch"} 13
+# HELP deployments Number of deployments
+# TYPE deployments gauge
+deployments{namespace="thenamespacetowatch"} 6
+# HELP services Number of services
+# TYPE services gauge
+services{namespace="thenamespacetowatch"} 4
+```
+
+This will launch **krs** in the foreground, gathering resource stats from the namespace **thenamespacetowatch** and outputting them respectively in the OpenMetrics format on **stdout** for you to further process.
+
+![krs screenshot][9]
+
+Screenshot of krs in action.
+
+But Michael, you may ask, why isn't it doing something useful (such as storing 'em in S3) with the metrics? Because [Unix philosophy][10].
+
+For those wondering if they can directly use Prometheus or [kubernetes/kube-state-metrics][3] for this task: Well, sure you can, why not? The emphasis of **krs** is on being a lightweight and easy-to-use alternative to already available tooling—and maybe even being slightly complementary in certain aspects.
+
+This was originally published on [Medium's ITNext][11] and is reprinted with permission.
+
+--------------------------------------------------------------------------------
+
+via: https://opensource.com/article/18/11/kubernetes-resource-statistics
+
+作者：[Michael Hausenblas][a]
+选题：[lujun9972][b]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://opensource.com/users/mhausenblas
+[b]: https://github.com/lujun9972
+[1]: http://troubleshooting.kubernetes.sh/
+[2]: https://github.com/kubernetes-incubator/spartakus
+[3]: https://github.com/kubernetes/kube-state-metrics
+[4]: https://github.com/mhausenblas/krs/blob/master/launch.sh
+[5]: https://github.com/mhausenblas/krs
+[6]: https://openmetrics.io/
+[7]: https://github.com/mhausenblas/krs/releases
+[8]: /file/412706
+[9]: https://opensource.com/sites/default/files/uploads/krs_screenshot.png (krs screenshot)
+[10]: http://harmful.cat-v.org/cat-v/
+[11]: https://itnext.io/kubernetes-resource-statistics-e8247f92b45c