kubernetes 之部署metrics-server

Kubernetes 版本是 1.14

# kubectl version --short
Client Version: v1.14.3
Server Version: v1.14.2

下载文件

for file in aggregated-metrics-reader.yaml auth-delegator.yaml auth-reader.yaml metrics-apiservice.yaml metrics-server-deployment.yaml metrics-server-service.yaml resource-reader.yaml
do 
wget https://raw.githubusercontent.com/kubernetes-incubator/metrics-server/master/deploy/1.8%2B/$file
done

执行文件

# kubectl apply -f .
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

检查结果

# kubectl get pod -n kube-system
NAME                                      READY   STATUS              RESTARTS   AGE
...
metrics-server-7cffff65bc-kg7gv           1/1     Running             0          104s

# kubectl get apiservices | grep metrics
v1beta1.metrics.k8s.io                 kube-system/metrics-server   True        6m53s

podmetrics.metrics.k8s.io "" not found

https://kubernetes.io/docs/tasks/configure-pod-container/assign-memory-resource/

[root@svn tasks]# kubectl top pod memory-demo --namespace=mem-example
Error from server (NotFound): podmetrics.metrics.k8s.io "mem-example/memory-demo" not found

Change the metrics-server-deployment.yaml file and add:

command:
    - /metrics-server 
    - --kubelet-preferred-address-types=InternalIP
    - --kubelet-insecure-tls

https://stackoverflow.com/questions/52224829/kubernetes-metrics-unable-to-fetch-pod-node-metrics

修正之后，结果显示如下：

[root@svn tasks]# kubectl top pod memory-demo --namespace=mem-example
NAME          CPU(cores)   MEMORY(bytes)
memory-demo   87m          151Mi

参考资料

• kubernetes 之部署metrics-server v0.3.1