使用prometheus pod监视golang webapp pod

Question

我在kubernetes集群中运行了一个golang webapp pod，并且我尝试部署一个prometheus pod来监控golang webapp pod。

我在service.yaml文件中指定了prometheus.io/port: to 2112，这是golang when应用程序正在侦听的端口，但是当我转到Prometheus仪表板时，它显示2112端点已关闭。

我正在关注this guide，尝试了这个线程的解决方案thread，但仍然得到2112端点关闭的结果。

下面是my service.yaml和deployment.yaml

apiVersion: v1
kind: Service
metadata:
  name: prometheus-service
  namespace: monitoring
  annotations:
      prometheus.io/scrape: 'true'
      prometheus.io/path: '/metrics'
      prometheus.io/port:   '2112'
spec:
  selector: 
    app: prometheus-server
  type: NodePort  
  ports:
    - port: 8080
      targetPort: 9090 
      nodePort: 30000
---
apiVersion: v1
kind: Service
metadata: 
  namespace: monitoring
  name: goapp
spec:
  type: NodePort
  selector:
    app: golang
  ports:
    - name: main
      protocol: TCP
      port: 80
      targetPort: 2112
      nodePort: 30001






apiVersion: apps/v1
kind: Deployment
metadata:
  name: prometheus-deployment
  namespace: monitoring
  labels:
    app: prometheus-server
spec:
  replicas: 1
  selector:
    matchLabels:
      app: prometheus-server
  template:
    metadata:
      labels:
        app: prometheus-server
    spec:
      containers:
        - name: prometheus
          image: prom/prometheus
          args:
            - "--config.file=/etc/prometheus/prometheus.yml"
            - "--storage.tsdb.path=/prometheus/"
          ports:
            - containerPort: 9090
          volumeMounts:
            - name: prometheus-config-volume
              mountPath: /etc/prometheus/
            - name: prometheus-storage-volume
              mountPath: /prometheus/
      volumes:
        - name: prometheus-config-volume
          configMap:
            defaultMode: 420
            name: prometheus-server-conf
  
        - name: prometheus-storage-volume
          emptyDir: {}
---
apiVersion: apps/v1
kind: Deployment
metadata:
  namespace: monitoring
  name: golang
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: golang
    spec:
      containers:
        - name: gogo
          image: effy77/gogo2
          ports: 
            - containerPort: 2112
  selector:
    matchLabels:
      app: golang

我将尝试将prometheus.io/port: 2112添加到prometheus部署部分，因为我怀疑这可能是原因。

Answer 1

我不知道把注解放在哪里，从这个thread中得到了澄清，我需要把它放在服务的元数据下，而这些元数据需要被prothemeus抓取。因此，在我的例子中，它需要在goapp的元数据中。

apiVersion: v1
kind: Service
metadata: 
  namespace: monitoring
  name: goapp
  annotations:
      prometheus.io/scrape: 'true'
      prometheus.io/path: '/metrics'
      prometheus.io/port:   '2112'