mac 上学习k8s系列（37）metrics-server

golang算法架构leetcode技术php 2022-01-23

457

 top
 PID    COMMAND      %CPU  TIME     #TH   #WQ  #PORT MEM    PURG   CMPRS  PGRP
37210  com.docker.h 155.4 31:23.69 13/4  0    36    11G+   0B     7922M- 36866
发现docker占用内存11G

top发现我们docker占用的内存特别大，去docker desktop的resource里面检查下发现设置的是8G加2G的swap，感觉有点大，能缩小吗？我们的pod实际占用了多少呢？

然后具体看下哪个pod占用比较多
  % kubectl top pod
error: Metrics API not available

默认没有安装metric-server安装下https://github.com/kubernetes-sigs/metrics-server/releases

% kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.6.0/components.yaml
serviceaccount/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
service/metrics-server created
deployment.apps/metrics-server created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created

由于国内原因，镜像k8s.gcr.io/metrics-server/metrics-server:v0.6.0拉不下来

% kubectl -n kube-system get pod metrics-server-65b979d49c-kdtg2 
NAME                              READY   STATUS             RESTARTS   AGE
metrics-server-65b979d49c-kdtg2   0/1     ImagePullBackOff   0          7m34s

 % kubectl top pod
Error from server (ServiceUnavailable): the server is currently unable to handle the request (get pods.metrics.k8s.io)

去docker hub找一个

% docker pull bitnami/metrics-server:latest
latest: Pulling from bitnami/metrics-server
edb9df82989e: Pull complete 
fd4ce8181ca9: Pull complete 
dd7359543396: Pull complete 
b515c7504db3: Pull complete 
a4af5d5f09ef: Pull complete 
48f8bc37bc18: Pull complete 
37af7a161a3c: Pull complete 
Digest: sha256:6f8bdb06de083988b13b6c08dee3e40e061194e07e6b780fa3d4de6c487fbd25
Status: Downloaded newer image for bitnami/metrics-server:latest
docker.io/bitnami/metrics-server:latest

发现pod启动失败

% kubectl -n kube-system logs metrics-server-57f695cd54-zf8fz 
 .go:188] "Failed probe" probe="metric-storage-ready" err="not metrics to serve"
E0123 03:38:08.027869       1 scraper.go:139] "Failed to scrape node" err="GET \"https://192.168.65.4:10250/stats/summary?only_cpu_and_memory=true\": bad status code \"403 Forbidden\"" node="docker-desktop"
I0123 03:38:13.498399       1 server.go:188] "Failed probe" probe="metric-storage-ready" err="not metrics to serve"

原因是没有配置https认证，我们本机学习，不用配置，修改下yaml

 - --kubelet-insecure-tls=true

发现还是不行，原因是默认的rbac授权权限不够，修改下

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: system:metrics-server
rules:
- apiGroups:
  - ""
  resources:
  - pods
  - nodes
  - nodes/stats
  - namespaces
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - "extensions"
  resources:
  - deployments
  verbs:
  - get
  - list
  - watch

检查下，发现已经启动成功了

% kubectl -n kube-system get pods metrics-server-664ffd5b45-mn4r8 
NAME                              READY   STATUS    RESTARTS   AGE
metrics-server-664ffd5b45-mn4r8   1/1     Running   0          6m22s

看下我们的内存和cpu占用

% kubectl top pod -n istio-system
NAME                                   CPU(cores)   MEMORY(bytes)
grafana-6ccd56f4b6-wp798               6m           42Mi
istio-egressgateway-687f4db598-rj2mg   5m           45Mi
istio-ingressgateway-8d5985f54-cvlcw   6m           42Mi
istiod-5698b78654-lm7r6                4m           49Mi
istiod-5698b78654-lwg4p                6m           52Mi
istiod-5698b78654-r2vp8                7m           46Mi
jaeger-5d44bc5c5d-mt9cq                3m           25Mi
kiali-79b86ff5bc-srf9k                 1m           12Mi
prometheus-64fd8ccd65-rn9lc            24m          406Mi

看下所有的占用

 % kubectl top node docker-desktop
NAME             CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%
docker-desktop   902m         22%    4147Mi          52%

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mac 上学习k8s系列（37）metrics-server

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