📃 Grafana

一、Grafana简介

二、安装Grafana

通过Helm安装

添加仓库并更新：

helm repo add grafana https://grafana.github.io/helm-charts
helm repo update

先创建一个namespace，以免默认添加到default：

kubectl create namespace grafana

部署Grafana：

helm install grafana grafana/grafana -n grafana

部署完成，看到控制台打印：

NAME: grafana
LAST DEPLOYED: Fri Oct 30 17:38:22 2020
NAMESPACE: grafana
STATUS: deployed
REVISION: 1
NOTES:
1. Get your 'admin' user password by running:
   kubectl get secret --namespace grafana grafana -o jsonpath="{.data.admin-password}" | base64 --decode ; echo
2. The Grafana server can be accessed via port 80 on the following DNS name from within your cluster:
   grafana.grafana.svc.cluster.local
   Get the Grafana URL to visit by running these commands in the same shell:
     export POD_NAME=$(kubectl get pods --namespace grafana -l "app.kubernetes.io/name=grafana,app.kubernetes.io/instance=grafana" -o jsonpath="{.items[0].metadata.name}")
     kubectl --namespace grafana port-forward $POD_NAME 3000
3. Login with the password from step 1 and the username: admin
#################################################################################
######   WARNING: Persistence is disabled!!! You will lose your data when   #####
######            the Grafana pod is terminated.                            #####
#################################################################################

通过Docker安装（仅供了解）

docker pull grafana/grafana
docker run -d -p 3000:3000 --name grafana --restart=always grafana/grafana
# or
docker run -d -p 3000:3000 --name grafana grafana/grafana
docker update --restart=always grafana

通过yum安装（仅供了解）

yum install https://s3-us-west-2.amazonaws.com/grafana-releases/release/grafana-6.3.3-1.x86_64.rpm -y
systemctl start grafana-server
systemctl enable grafana-server

通过yaml文件部署（仅供了解）

apiVersion: v1
kind: Service
metadata:
  name: grafana-dashboard
spec:
  template:
    metadata:
      labels:
        name: grafana-dashboard
        namespace: grafana-dashboard
  selector:
    run: grafana-dashboard-pod
  ports:
    - protocol: TCP
      port: 3000
      targetPort: 3000
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: grafana-dashboard-pod
  namespace: kube-system
spec:
  replicas: 4
  template:
    metadata:
      labels:
        run: grafana-dashboard-pod
    spec:
      containers:
        - name: grafana
          image: grafana/grafana:latest
          ports:
            - containerPort: 3000
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: grafana-dashboard-ing
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
    - host: grafana.test.com
      http:
        paths:
          - backend:
              serviceName: grafana-dashboard
              servicePort: 3000

三、暴露Grafana管理界面

首先在hosts中添加：

127.0.0.1    grafana.dashboard.com

创建一个 IngressRoute：

apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  name: grafana-route
  namespace: grafana
spec:
  entryPoints:
    - web
  routes:
    - match: Host(`grafana.dashboard.com`)
      kind: Rule
      services:
        - name: grafana
          port: 80

应用即可：

kubectl apply -f route.yaml -n grafana

四、访问Prometheus管理界面

经过前面的一通操作，我们可以直接在浏览器中输入 http://grafana.dashboard.com 访问：

第一次访问的时候，通过以下命令获取密码：

$ kubectl get secret --namespace grafana grafana -o jsonpath="{.data.admin-password}" | base64 --decode ; echo
C0RUtQQajyLEqJ5pyfNXvtvLgYMEYOSIukFlngjf

用户名为 admin，用刚刚获取到的密码登录：

五、配置 DataSource

添加一个数据源

把 Prometheus 的地址填上

导入 prometheus 的模板

打开左上角选择已经导入的模板会看到已经有各种图

导入模板：文件路径 k8s-ha-install/heapster/grafana-dashboard