轻量级Kubernetes发行版k3s之部署metrics-server

安装

从官方仓库下载项目文件：

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

$ cd metrics-server/deploy/1.8+

$ ls
aggregated-metrics-reader.yaml  auth-reader.yaml         metrics-server-deployment.yaml  resource-reader.yaml
auth-delegator.yaml             metrics-apiservice.yaml  metrics-server-service.yaml

---

下载镜像

需要使用的镜像为 k8s.gcr.io/metrics-server-amd64:v0.3.4 。

通过如下的脚本来下载：

创建文件 $ vim pull_images.sh

#!/bin/bash
images=(metrics-server-amd64:v0.3.4)
for imageName in ${images[@]} ; do
  docker pull gcr.azk8s.cn/google_containers/$imageName
  docker tag gcr.azk8s.cn/google_containers/$imageName k8s.gcr.io/$imageName
  docker rmi gcr.azk8s.cn/google_containers/$imageName
done

执行 $ bash ./pull_images.sh

查看该镜像：

$ docker images

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修改yaml文件

修改 metrics-server-deployment.yaml 将其中 Deployment 中镜像的 imagePullPolicy: Always 改成 imagePullPolicy: IfNotPresent ,以使用本地下载的镜像。

编辑文件 $ vim metrics-server-deployment.yaml

部署

安装

$ cd ../../

$ kubectl apply -f deploy/1.8+
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created
serviceaccount/metrics-server created
deployment.extensions/metrics-server created
service/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created

查看容器运行状态

$ kubectl get pods -n kube-system
NAME                              READY   STATUS    RESTARTS   AGE
metrics-server-5588fd886b-bcp7x   1/1     Running   0          44s

效果查看

$ kubectl top nodes -n kube-system
NAME         CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%
k3s-agent    20m          2%     202Mi           20%
k3s-master   50m          5%     543Mi           54%


$ kubectl top pods -n kube-system
NAME                              CPU(cores)   MEMORY(bytes)
coredns-b7464766c-dbl29           3m           22Mi
metrics-server-5588fd886b-bcp7x   1m           13Mi
svclb-traefik-rmwcp               0m           1Mi
svclb-traefik-t4gbn               0m           1Mi
tiller-deploy-749f694975-f9rft    1m           9Mi
traefik-5c79b789c5-8jsvg          3m           21Mi

# 查看所有Pods
$ kubectl top pods --all-namespaces

相关参考

• Configuration Info
• kubernetes-incubator/metrics-server

未完待续。。。