在 k8s 集群中安装 Grafana

本文演示如何在 K8s 集群中安装 Grafana, 对 K8s 集群中的 CPU, Memory 进行监控。

建立一个新的 NFS 目录

建立一个共享目录

1	sudo mkdir /var/nfs/grafana -p

改变目录所有者

1	sudo chown nobody:nogroup /var/nfs/grafana

配置 nfs

1	sudo vi /etc/exports

添加如下内容

1	/var/nfs/grafana 192.168.11.0/24(rw,sync,no_subtree_check)

注意：用你实际的IP替换上面IP

保存以后执行

1	sudo exportfs -arvf

1	sudo systemctl restart nfs-kernel-server

查看列表

1	showmount -e

部署 grafana

新建名为 grafana.yaml 的文件，内容如下

apiVersion: v1
kind: PersistentVolume
metadata:
  name: "grafana-data-pv"
  labels:
    name: grafana-data-pv
    release: stable
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  nfs:
    path: /var/nfs/grafana
    server: 192.168.11.16
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: grafana-data-pvc
  namespace: ns-monitor
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  selector:
    matchLabels:
      name: grafana-data-pv
      release: stable
---
kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    app: grafana
  name: grafana
  namespace: ns-monitor
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: grafana
  template:
    metadata:
      labels:
        app: grafana
    spec:
      securityContext:
        runAsUser: 0
      containers:
        - name: grafana
          image: grafana/grafana:latest
          imagePullPolicy: IfNotPresent
          env:
            - name: GF_AUTH_BASIC_ENABLED
              value: "true"
            - name: GF_AUTH_ANONYMOUS_ENABLED
              value: "false"
          readinessProbe:
            httpGet:
              path: /login
              port: 3000
          volumeMounts:
            - mountPath: /var/lib/grafana
              name: grafana-data-volume
          ports:
            - containerPort: 3000
              protocol: TCP
      volumes:
        - name: grafana-data-volume
          persistentVolumeClaim:
            claimName: grafana-data-pvc
---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: grafana
  name: grafana-service
  namespace: ns-monitor
spec:
  ports:
    - port: 3000
      targetPort: 3000
  selector:
    app: grafana
  type: NodePort

注意：用你实际的IP和目录替换上面IP和目录

保存以后执行

1	kubectl apply -f grafana.yaml

验证

1	kubectl get pod -n ns-monitor

NAME                          READY   STATUS    RESTARTS   AGE
grafana-66568fb745-bg2lf      1/1     Running   0          3m15s
node-exporter-hk4rv           1/1     Running   0          91m
node-exporter-jjkrc           1/1     Running   0          91m
node-exporter-qdx8d           1/1     Running   0          91m
prometheus-7fbcbcf664-2g82n   1/1     Running   0          32m

1	kubectl get svc -n ns-monitor

1
2
3

grafana-service         NodePort   10.100.110.149   <none>        3000:31004/TCP   3m43s
node-exporter-service   NodePort   10.103.175.254   <none>        9100:31672/TCP   94m
prometheus-service      NodePort   10.106.108.178   <none>        9090:32426/TCP   32m

然后就可以通过浏览器进行访问了

1	浏览器访问： http://主机ip:31004 默认用户名和密码：admin/admin

登陆以后改变密码

修改 prometheus配置成数据源：

1	http://prometheus-service.ns-monitor:9090

接着，加入一个新的 Dashboard

“+” -> “Import”

把 kubernetes的Dashboard的模板导入进来

直接导入 json 文件

大功告成