Docker Kubernetes (Mac) - Autoscaler 无法找到指标 [英] Docker Kubernetes (Mac) - Autoscaler unable to find metrics

问题描述

我已经在我的 Mac 上通过 Docker 安装了 Kubernetes 的本地实例.

I have installed a local instance of Kubernetes via Docker on my Mac.

按照演练了解如何激活部署上的自动缩放 我遇到了一个问题.自动调节程序无法读取指标.

Following the walkthrough on how to activate autoscaling on a deployment I have experienced an issue. The autoscaler can't read the metrics.

当我运行 kubectl describe hpa 时，当前的 CPU 使用率返回为 unknown/50% 并带有警告:

When I am running kubectl describe hpa the current cpu usage comes back as unknown / 50% with the warnings:

警告失败GetResourceMetric:水平 pod-autoscaler 无法获取资源 cpu 的指标:无法从 API 获取指标:服务器找不到请求的资源(获取 pods.metrics.k8s.io)

Warning FailedGetResourceMetric: horizontal-pod-autoscaler unable to get metrics for resource cpu: unable to fetch metrics from API: the server could not find the requested resource (get pods.metrics.k8s.io)

警告失败ComputeMetricsReplicas水平 pod-autoscaler 未能获得 CPU 利用率:无法获取资源 cpu 的指标:无法从 API 获取指标:服务器找不到请求的资源(获取 pods.metrics.k8s.io)

Warning FailedComputeMetricsReplicas horizontal-pod-autoscaler failed to get cpu utilization: unable to get metrics for resource cpu: unable to fetch metrics from API: the server could not find the requested resource (get pods.metrics.k8s.io)

我已经通过 git clone https://github.com/kubernetes-incubator/metrics-server.git 安装了 metrics-server 并使用 kubectl create -f deploy/安装了它1.8+

I have installed the metrics-server via git clone https://github.com/kubernetes-incubator/metrics-server.gitand installed it with kubectl create -f deploy/1.8+

推荐答案

我终于让它工作了..以下是我为使事情顺利进行而采取的完整步骤:

I finally got it working.. Here are the full steps I took to get things working:

1. 在 Docker 中运行 Kubernetes

1. Have Kubernetes running within Docker

使用 kubectl delete -n kube-system deployments.apps metrics-server

使用 git clone https://github.com/kubernetes-incubator/metrics-server.git

编辑文件 deploy/1.8+/metrics-server-deployment.yaml 以通过添加不存在的 command 部分来覆盖默认命令前.新部分将指示 metrics-server 允许不安全的通信会话(不要验证所涉及的证书).仅针对 Docker 执行此操作，不适用于指标服务器的生产部署:

Edit the file deploy/1.8+/metrics-server-deployment.yaml to override the default command by adding a command section that didn't exist before. The new section will instruct metrics-server to allow for an insecure communications session (don't verify the certs involved). Do this only for Docker, and not for production deployments of metrics-server:

containers:
- name: metrics-server
    image: k8s.gcr.io/metrics-server-amd64:v0.3.1
    command:
      - /metrics-server
      - --kubelet-insecure-tls

使用 kubectl create -f deploy/1.8+ 将 metrics-server 添加到您的 Kubernetes 实例(如果 .yaml 出错，请改写:kubectl apply -f deploy/1.8+)

Add metrics-server to your Kubernetes instance with kubectl create -f deploy/1.8+ (if errors with the .yaml, write this instead: kubectl apply -f deploy/1.8+)

删除自动缩放程序并将其重新添加到您的部署中.它现在应该显示当前的 CPU 使用情况.

Remove and add the autoscaler to your deployment again. It should now show the current cpu usage.

编辑 2020 年 7 月:

上述大部分步骤都适用，除了 metrics-server 已经改变并且文件不再存在.

Most of the above steps hold true except the metrics-server has changed and that file does not exist anymore.

repo 现在建议这样安装:

The repo now recommends installing it like this:

apply -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.6/components.yaml

所以我们现在可以下载这个文件了，

So we can now download this file,

curl -L https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.6/components.yaml --output components.yaml

在 args (L88) 下添加 --kubelet-insecure-tls 到 metrics-server 部署并运行

add --kubelet-insecure-tls under args (L88) to the metrics-server deployment and run

kubectl apply -f components.yaml

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