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add metrics-demo
Signed-off-by: Piwriw <[email protected]>
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‎metrics-demo/README.md‎

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# metrics-demo
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## Environment prepare
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- KubeEdge、k8s 、node、cloud and so on
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## Steps
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1. Open `edgeStream` in edge
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```sh
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vim /etc/kubeedge/config/edgecore.yaml
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```
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```yaml
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modules:
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...
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edgeStream:
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enable: true
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handshakeTimeout: 30
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readDeadline: 15
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server: 124.222.110.11:10004
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tlsTunnelCAFile: /etc/kubeedge/ca/rootCA.crt
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tlsTunnelCertFile: /etc/kubeedge/certs/server.crt
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tlsTunnelPrivateKeyFile: /etc/kubeedge/certs/server.key
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writeDeadline: 15
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....
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```
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2. Restart EdgeCore
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```sh
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systemctl restart edgecore.service
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```
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3. Download `metrics-server` yaml,you should care about `Metrics Server Version` and ` Kubernetes version` ,more in [metrics-server](https://github.com/kubernetes-sigs/metrics-server)
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```sh
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wget https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
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```
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4. Add ` hostNetwork: true` in yaml and ` - --kubelet-insecure-tls`
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```yaml
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template:
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metadata:
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labels:
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k8s-app: metrics-server
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spec:
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hostNetwork: true
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containers:
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- args:
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- --cert-dir=/tmp
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- --secure-port=4443
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- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
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- --kubelet-use-node-status-port
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- --metric-resolution=15s
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- --kubelet-insecure-tls
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image: k8s.gcr.io/metrics-server/metrics-server:v0.6.2
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```
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5. Apply for metrics-server when you can normal download from `k8s.gcr.io`
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```sh
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kubectl apply -f components.yaml
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```
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When you can't access normally `k8s.gcr.io`,you can try this way：
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```sh
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# find the image
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cat components.yaml
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# Pull from dockerproxy
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docker pull k8s.dockerproxy.com/metrics-server/metrics-server:v0.6.2
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# use docker tag
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docker tag k8s.dockerproxy.com/metrics-server/metrics-server:v0.6.2 k8s.gcr.io/metrics-server/metrics-server:v0.6.2
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# apply for yaml
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kubectl apply -f components.yaml
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```
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## Test
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It is tested by redis.
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1. Edit the `redis.yaml`, you should care `spec/nodeName` to use your nodeName
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```sh
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vim redis.yaml
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```
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2. Apply for `redis.yaml`
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```sh
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kubectl apply redis.yaml
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```
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3. Now,you can view logs from edge
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```sh
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# find redid pod
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kubectl get po -A
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# view logs in cloud
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kubectl logs redis-7c84bc4b7f-x5kmk
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# view log in edge to validate
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docker logs k8s_redis_redis-7c84bc4b7f-znjs4_default_3ce4f96b-f8a8-4d1f-a983-b8165b65522f_0
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```
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You will get results just like this
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Cloud logs：
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<img src="images/metrics-redis-result-cloud.png">
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Edge logs：
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<img src="images/metrics-redis-result-edge.png">

‎metrics-demo/crds/components.yaml‎

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apiVersion: v1
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kind: ServiceAccount
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metadata:
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labels:
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k8s-app: metrics-server
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name: metrics-server
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namespace: kube-system
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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labels:
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k8s-app: metrics-server
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rbac.authorization.k8s.io/aggregate-to-admin: "true"
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rbac.authorization.k8s.io/aggregate-to-edit: "true"
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rbac.authorization.k8s.io/aggregate-to-view: "true"
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name: system:aggregated-metrics-reader
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rules:
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- apiGroups:
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- metrics.k8s.io
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resources:
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- pods
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- nodes
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verbs:
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- get
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- list
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- watch
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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labels:
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k8s-app: metrics-server
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name: system:metrics-server
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rules:
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- apiGroups:
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- ""
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resources:
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- nodes/metrics
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verbs:
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- get
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- apiGroups:
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- ""
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resources:
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- pods
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- nodes
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verbs:
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- get
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- list
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- watch
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: RoleBinding
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metadata:
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labels:
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k8s-app: metrics-server
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name: metrics-server-auth-reader
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namespace: kube-system
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: Role
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name: extension-apiserver-authentication-reader
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subjects:
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- kind: ServiceAccount
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name: metrics-server
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namespace: kube-system
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRoleBinding
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metadata:
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labels:
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k8s-app: metrics-server
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name: metrics-server:system:auth-delegator
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: ClusterRole
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name: system:auth-delegator
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subjects:
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- kind: ServiceAccount
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name: metrics-server
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namespace: kube-system
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRoleBinding
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metadata:
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labels:
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k8s-app: metrics-server
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name: system:metrics-server
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: ClusterRole
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name: system:metrics-server
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subjects:
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- kind: ServiceAccount
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name: metrics-server
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namespace: kube-system
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---
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apiVersion: v1
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kind: Service
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metadata:
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labels:
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k8s-app: metrics-server
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name: metrics-server
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namespace: kube-system
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spec:
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ports:
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- name: https
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port: 443
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protocol: TCP
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targetPort: https
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selector:
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k8s-app: metrics-server
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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k8s-app: metrics-server
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name: metrics-server
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namespace: kube-system
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spec:
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selector:
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matchLabels:
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k8s-app: metrics-server
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strategy:
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rollingUpdate:
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maxUnavailable: 0
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template:
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metadata:
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labels:
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k8s-app: metrics-server
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spec:
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hostNetwork: true
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containers:
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- args:
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- --cert-dir=/tmp
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- --secure-port=4443
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- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
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- --kubelet-use-node-status-port
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- --metric-resolution=15s
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image: k8s.gcr.io/metrics-server/metrics-server:v0.6.2
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imagePullPolicy: IfNotPresent
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livenessProbe:
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failureThreshold: 3
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httpGet:
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path: /livez
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port: https
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scheme: HTTPS
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periodSeconds: 10
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name: metrics-server
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ports:
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- containerPort: 4443
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name: https
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protocol: TCP
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readinessProbe:
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failureThreshold: 3
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httpGet:
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path: /readyz
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port: https
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scheme: HTTPS
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initialDelaySeconds: 20
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periodSeconds: 10
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resources:
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requests:
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cpu: 100m
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memory: 200Mi
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securityContext:
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allowPrivilegeEscalation: false
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readOnlyRootFilesystem: true
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runAsNonRoot: true
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runAsUser: 1000
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volumeMounts:
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- mountPath: /tmp
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name: tmp-dir
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nodeSelector:
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kubernetes.io/os: linux
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priorityClassName: system-cluster-critical
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serviceAccountName: metrics-server
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volumes:
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- emptyDir: {}
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name: tmp-dir
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---
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apiVersion: apiregistration.k8s.io/v1
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kind: APIService
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metadata:
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labels:
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k8s-app: metrics-server
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name: v1beta1.metrics.k8s.io
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spec:
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group: metrics.k8s.io
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groupPriorityMinimum: 100
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insecureSkipTLSVerify: true
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service:
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name: metrics-server
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namespace: kube-system
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version: v1beta1
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versionPriority: 100

‎metrics-demo/crds/redis.yaml‎

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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: redis
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spec:
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selector:
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matchLabels:
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app: redis
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replicas: 1
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template:
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metadata:
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labels:
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app: redis
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spec:
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nodeName: edge-02
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containers:
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- name: redis
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image: redis

‎metrics-demo/images/metrics-redis-result-cloud.png‎

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‎metrics-demo/images/metrics-redis-result-edge.png‎

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