Kubernetes安装和部署metrics-server-创新互联

#一、metrics-server简介
自kubernetes 1.8开始,资源使用指标(如容器 CPU 和内存使用率)通过 Metrics API 在 Kubernetes 中获取,metrics-server 替代了heapster。Metrics Server 实现了Resource Metrics API,Metrics Server 是集群范围资源使用数据的聚合器。 
Metrics Server 从每个节点上的 Kubelet 公开的 Summary API 中采集指标信息。

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Kubernetes中有些组件依赖资源指标API(metric API)的功能 ,如kubectl top 、hpa。如果没有资源指标API接口,这些组件无法运行。在之前使用的是Heapster,Heapster废弃后改用metrics-server。

  • 通过Metrics API可以获取指定node或者pod的当前资源使用情况(而无法获取历史数据)
  • Metrics API的api路径:/apis/metrics.k8s.io/
  • Metrics API的使用需要在K8S集群中成功部署metrics server

kubernetes metrics server 参考文档 https://github.com/kubernetes-incubator/metrics-server

#二、安装metrics-server

1、下载所需文件
# mkdir ./metrics-server  
# cd metrics-server/  
# 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 

2、这里需要改2个地方,一个是镜像的问题,一个是服务启动的问题。  

# 在所有Node节点上执行。先把镜像国通阿里云的镜像源下载下来。再改个名字。  
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server-amd64:v0.3.3  
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server-amd64:v0.3.3 k8s.gcr.io/metrics-server-amd64:v0.3.3  

# 修改metrics-server-deployment.yaml,增加一个imagePullPolicy,增加command内容,否则会报错no metrics known for node。相关问题原因自行百度。  
# vim metrics-server-deployment.yaml  
 30    containers:  
 31    - name: metrics-server  
 32     image: k8s.gcr.io/metrics-server-amd64:v0.3.3  
 33     imagePullPolicy: IfNotPresent  
 34     command:  
 35      - /metrics-server  
 36      - --kubelet-preferred-address-types=InternalIP,Hostname,InternalDNS,ExternalDNS,ExternalIP
 37      - --kubelet-insecure-tls  
 38     volumeMounts:  
 39     - name: tmp-dir  
 40      mountPath: /tmp  

# 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  

3、查看pod状态  
metrics-server-55898485b6-pdhnz        1/1   Running  0      93m   10.244.4.2    huoban-k8s-node01  

4、查看node资源使用情况( 一定要等几分钟,采集数据需要时间) 
kubectl top node  
NAME          CPU(cores)  CPU%  MEMORY(bytes)  MEMORY%   
huoban-k8s-master01  72m      3%   612Mi      16%     
huoban-k8s-master02  93m      4%   713Mi      19%     
huoban-k8s-master03  108m     5%   674Mi      18%     
huoban-k8s-node01   26m      1%   334Mi      9%      
huoban-k8s-node02   26m      1%   339Mi      9%     

5、查看pod资源使用情况
# kubectl top pods -n kube-system
NAME                      CPU(cores)  MEMORY(bytes)
coredns-6967fb4995-4qlfb            1m      13Mi
coredns-6967fb4995-frv2p            1m      12Mi
etcd-huoban-k8s-master01            22m      358Mi
etcd-huoban-k8s-master02            25m      364Mi
etcd-huoban-k8s-master03            23m      381Mi
kube-apiserver-huoban-k8s-master01       15m      267Mi
kube-apiserver-huoban-k8s-master02       13m      255Mi
kube-apiserver-huoban-k8s-master03       17m      249Mi
kube-controller-manager-huoban-k8s-master01  7m      69Mi
kube-controller-manager-huoban-k8s-master02  0m      14Mi
kube-controller-manager-huoban-k8s-master03  0m      14Mi
kube-flannel-ds-amd64-6bp76          1m      21Mi
kube-flannel-ds-amd64-nrvvz          1m      15Mi
kube-flannel-ds-amd64-shv4n          1m      16Mi
kube-flannel-ds-amd64-t77n4          1m      15Mi
kube-proxy-8d522                1m      19Mi
kube-proxy-9ng4j                1m      18Mi
kube-proxy-htw7p                1m      20Mi
kube-proxy-n9r48                1m      17Mi
kube-proxy-nsqgh                1m      17Mi
kube-scheduler-huoban-k8s-master01       1m      27Mi
kube-scheduler-huoban-k8s-master02       0m      16Mi
kube-scheduler-huoban-k8s-master03       0m      13Mi
kubernetes-dashboard-86844cc55f-sz4gn     0m      13Mi
metrics-server-d9d75756b-l75wj         1m      17Mi 

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