• Metrics API 只可以查询当前的度量数据，并不保存历史数据

• Metrics API URI 为 /apis/metrics.k8s.io/，在 k8s.io/metrics维护

• 必须部署 metrics-server 才能使用该 API，metrics-server 通过调用 Kubelet Summary API 获取数据

部署Metrics-Server服务

---

1.下载并解压Metrics-Server

https://github.com/kubernetes-sigs/metrics-server/archive/v0.3.6.tar.gz

tar -zxvf v0.3.6.tar.gz

2.修改Metrics-Server配置文件

cd metrics-server-0.3.6/deploy/1.8+/

vim metrics-server-deployment.yaml

vim metrics-server-deployment.yaml文件原有的内容如下所示。

---

apiVersion: v1

kind: ServiceAccount

metadata:

name: metrics-server

namespace: kube-system

---

apiVersion: apps/v1

kind: Deployment

metadata:

name: metrics-server

namespace: kube-system

labels:

k8s-app: metrics-server

spec:

selector:

matchLabels:

k8s-app: metrics-server

template:

metadata:

name: metrics-server

labels:

k8s-app: metrics-server

spec:

serviceAccountName: metrics-server

volumes:

mount in tmp so we can safely use from-scratch images and/or read-only containers

• name: tmp-dir

emptyDir: {}

containers:

• name: metrics-server

image: k8s.gcr.io/metrics-server-amd64:v0.3.6

imagePullPolicy: Always

volumeMounts:

• name: tmp-dir

mountPath: /tmp

修改后的文件内容如下所示。

---

apiVersion: v1

kind: ServiceAccount

metadata:

name: metrics-server

namespace: kube-system

---

apiVersion: apps/v1

kind: Deployment

metadata:

name: metrics-server

namespace: kube-system

labels:

k8s-app: metrics-server

spec:

selector:

matchLabels:

k8s-app: metrics-server

template:

metadata:

name: metrics-server

labels:

k8s-app: metrics-server

spec:

serviceAccountName: metrics-server

volumes:

mount in tmp so we can safely use from-scratch images and/or read-only containers

• name: tmp-dir

emptyDir: {}

containers:

• name: metrics-server

修改image 和 imagePullPolicy

image: mirrorgooglecontainers/metrics-server-amd64:v0.3.6

imagePullPolicy: IfNotPresent

新增command配置

command:

• /metrics-server

• –kubelet-insecure-tls

• –kubelet-preferred-address-types=InternalDNS,InternalIP,ExternalDNS,ExternalIP,Hostname

volumeMounts:

• name: tmp-dir

mountPath: /tmp

新增resources配置

resources:

limits:

cpu: 300m

memory: 200Mi

requests:

cpu: 200m

memory: 100Mi

修改完metrics-server-deployment.yaml文件后保存退出。

3.安装Metrics-Server

执行如下命令安装Metrics-Server。

kubectl apply -f metrics-server-0.3.6/deploy/1.8+/