|NO.Z.00325|——————————|CloudNative|——|KuberNetes&运维.V43|——|白盒监控.v05|kafka.v02|

一、监控没有metrics接口的业务应用：以kafka为例

### --- 创建一个kafka-exporter的deployment
~~~     创建kafka-exporter的yaml文件

[root@k8s-master01 kafka-exporter]# vim kafka-exporter-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
  labels:
    app: kafka-exporter
  name: kafka-exporter
  namespace: monitoring
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: kafka-exporter
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: kafka-exporter
    spec:
      containers:
      - args:
        - --kafka.server=kafka-0.kafka-headless.public-service:9092
        env:
        - name: TZ
          value: Asia/Shanghai
        - name: LANG
          value: C.UTF-8
        image: danielqsj/kafka-exporter:latest
        imagePullPolicy: IfNotPresent
        lifecycle: {}
        name: kafka-exporter
        ports:
        - containerPort: 9308
          name: web
          protocol: TCP
        resources:
          limits:
            cpu: 249m
            memory: 318Mi
          requests:
            cpu: 10m
            memory: 10Mi
        securityContext:
          allowPrivilegeEscalation: false
          privileged: false
          readOnlyRootFilesystem: false
          runAsNonRoot: false
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /usr/share/zoneinfo/Asia/Shanghai
          name: tz-config
        - mountPath: /etc/localtime
          name: tz-config
        - mountPath: /etc/timezone
          name: timezone
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
      volumes:
      - hostPath:
          path: /usr/share/zoneinfo/Asia/Shanghai
          type: ""
        name: tz-config
      - hostPath:
          path: /etc/timezone
          type: ""
        name: timezone

### --- 创建kafka-exporter

[root@k8s-master01 kafka-exporter]# kubectl create -f kafka-exporter-deployment.yaml 
deployment.apps/kafka-exporter created

### --- 查看创建的kafka-exporter

[root@k8s-master01 kafka-exporter]# kubectl get po -n monitoring -owide
NAME                                   READY   STATUS    RESTARTS   AGE     IP               NODE           NOMINATED NODE   READINESS GATES
kafka-exporter-d47b9f76f-k92rm         1/1     Running   0          37s     172.27.14.227    k8s-node02     <none>           <none>

二、创建kafka-exporter的service和endpoint

### --- 创建kafka-exporter的service配置文件

[root@k8s-master01 kafka-exporter]# vim kafka-exporter-svc.yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    app: kafka-exporter
  name: kafka-exporter
  namespace: monitoring
  resourceVersion: "11300354"
spec:
  ports:
  - name: container-1-web-1
    port: 9308
    protocol: TCP
    targetPort: 9308
  selector:
    app: kafka-exporter
  sessionAffinity: None
  type: ClusterIP

### --- 常见service和endpoint

[root@k8s-master01 kafka-exporter]# kubectl create -f kafka-exporter-svc.yaml 
service/kafka-exporter created

### --- 查看创建的po,svc,ep资源详情

[root@k8s-master01 kafka-exporter]# kubectl get po,svc,ep -n monitoring -owide
NAME                                       READY   STATUS    RESTARTS   AGE     IP               NODE           NOMINATED NODE   READINESS GATES
pod/kafka-exporter-d47b9f76f-k92rm         1/1     Running   0          12m     172.27.14.227    k8s-node02     <none>           <none>
NAME                            TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE     SELECTOR
service/kafka-exporter          ClusterIP   10.110.47.163   <none>        9308/TCP                     53s     app=kafka-exporter
NAME                              ENDPOINTS                                                     AGE                                         3d15h
endpoints/kafka-exporter          172.27.14.227:9308                                            52s

三、验证kafka-exporter-svc是否可以获取数据

### --- 查看创建的svc

[root@k8s-master01 kafka-exporter]# kubectl get svc -n monitoring
NAME                    TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
kafka-exporter          ClusterIP   10.110.47.163   <none>        9308/TCP   7m51s

### --- curl一下svc的地址，查看是否可以获取数据

[root@k8s-master01 kafka-exporter]# curl 10.110.47.163:9308/metrics
# HELP promhttp_metric_handler_requests_in_flight Current number of scrapes being served.
# TYPE promhttp_metric_handler_requests_in_flight gauge
promhttp_metric_handler_requests_in_flight 1
# HELP promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code.
# TYPE promhttp_metric_handler_requests_total counter
promhttp_metric_handler_requests_total{code="200"} 2
promhttp_metric_handler_requests_total{code="500"} 0
promhttp_metric_handler_requests_total{code="503"} 0

### --- 查看kafka-exporter的日志是否发生报错
~~~     注：目前环境没有报错

[root@k8s-master01 kafka-exporter]# kubectl logs -f kafka-exporter-d47b9f76f-k92rm -n monitoring
time="2021-05-28T12:15:07+08:00" level=info msg="Refreshing client metadata" source="kafka_exporter.go:255"
time="2021-05-28T12:16:14+08:00" level=info msg="Refreshing client metadata" source="kafka_exporter.go:255"

四、创建kafka-exporter- ServiceMonitor

### --- 创建kafka-exporter- ServiceMonitor的yaml文件

[root@k8s-master01 kafka-exporter]# vim kafka-exporter-ServiceMonitor.yaml 
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  labels:
    k8s-app: kafka-exporter
  name: kafka-exporter
  namespace: monitoring
spec:
  endpoints:
  - interval: 30s
    port: container-1-web-1                 
  namespaceSelector:
    matchNames:
    - monitoring
  selector:
    matchLabels:
      app: kafka-exporter

### --- 创建kafka-exporter- ServiceMonitor

[root@k8s-master01 kafka-exporter]# kubectl create -f kafka-exporter-ServiceMonitor.yaml -n monitoring
servicemonitor.monitoring.coreos.com/kafka-exporter created

### --- 查看创建的servicemonitor

[root@k8s-master01 kafka-exporter]# kubectl get servicemonitor -n monitoring
NAME                      AGE
kafka-exporter            34s

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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