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云原生监控系统Prometheus——Exporter（Redis-exporter）

Exporter（Redis-exporter）

在安装之前，首先在官方下载页面 https://github.com/prometheus/mysqld_exporter/releases/ 找到最新 redis_exporter 版本，下载最新版本中特定平台的二进制文件，如下：

一、部署 redis_exporter

我这里都是 kubernetes 环境，就不讲二进制部署了。以下是 StatefulSet 运行的 Reids server 服务，以及 redis_exporter 的配置清单 yaml 文件：

redis server 版本号：redis:6.0.9-alpine

redis server 的 statefulset 配置清单文件如下：

kind: StatefulSet
apiVersion: apps/v1
metadata:
  name: redis-ke9owy
  namespace: devops-redis-test
  labels:
    app.kubernetes.io/instance: redis-ke9owy
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/name: redis
    app.kubernetes.io/version: 6.0.9
    app.kubesphere.io/instance: redis-ke9owy
    helm.sh/chart: redis-0.3.5
  annotations:
    kubesphere.io/creator: admin
    meta.helm.sh/release-name: redis-ke9owy
    meta.helm.sh/release-namespace: devops-redis-test
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/instance: redis-ke9owy
      app.kubernetes.io/name: redis
  template:
    metadata:
      creationTimestamp: null
      labels:
        app.kubernetes.io/instance: redis-ke9owy
        app.kubernetes.io/name: redis
      annotations:
        kubesphere.io/creator: admin
    spec:
      volumes:
        - name: configs
          configMap:
            name: redis-ke9owy
            defaultMode: 420
      containers:
        - name: redis
          image: 'redis:6.0.9-alpine'
          command:
            - /bin/sh
            - '-c'
            - |
              rm -rf /redis/data/lost+found
              args="
              --include /tmp/conf/default.conf
              --include /tmp/conf/user.conf
 
              "
              redis-server $args
          ports:
            - name: redis
              containerPort: 6379
              protocol: TCP
          resources: {}
          volumeMounts:
            - name: configs
              mountPath: /tmp/conf
            - name: data
              mountPath: /data/redis
          terminationMessagePath: /dev/termination-log
          terminationMessagePolicy: File
          imagePullPolicy: IfNotPresent
      restartPolicy: Always
      terminationGracePeriodSeconds: 30
      dnsPolicy: ClusterFirst
      securityContext: {}
      schedulerName: default-scheduler
  volumeClaimTemplates:
    - kind: PersistentVolumeClaim
      apiVersion: v1
      metadata:
        name: data
        creationTimestamp: null
        labels:
          app.kubernetes.io/instance: redis-ke9owy
          app.kubernetes.io/name: redis
      spec:
        accessModes:
          - ReadWriteOnce
        resources:
          requests:
            storage: 1Gi
        volumeMode: Filesystem
      status:
        phase: Pending
  serviceName: redis-ke9owy
  podManagementPolicy: OrderedReady
  updateStrategy:
    type: RollingUpdate
    rollingUpdate:
      partition: 0
  revisionHistoryLimit: 10

redis_exporter 版本号：oliver006/redis_exporter:v1.3.4

redis_exporter 的 Deployment 配置清单 yaml 文件如下：

kind: Deployment
apiVersion: apps/v1
metadata:
  name: redis-e-rhqcz7-redis-exporter
  namespace: devops-redis-test
  labels:
    app: redis-exporter
    app.kubernetes.io/managed-by: Helm
    app.kubesphere.io/instance: redis-e-rhqcz7
    chart: redis-exporter-3.4.5
    heritage: Helm
    release: redis-e-rhqcz7
  annotations:
    deployment.kubernetes.io/revision: '1'
    kubesphere.io/creator: admin
    meta.helm.sh/release-name: redis-e-rhqcz7
    meta.helm.sh/release-namespace: devops-redis-test
spec:
  replicas: 1
  selector:
    matchLabels:
      app: redis-exporter
      release: redis-e-rhqcz7
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: redis-exporter
        release: redis-e-rhqcz7
      annotations:
        kubesphere.io/creator: admin
    spec:
      containers:
        - name: redis-exporter
          image: 'oliver006/redis_exporter:v1.3.4'
          ports:
            - name: exporter-port
              containerPort: 9121
              protocol: TCP
          env:
            - name: REDIS_ADDR
              value: 'redis://myredis:6379'
          resources: {}
          livenessProbe:
            httpGet:
              path: /
              port: exporter-port
              scheme: HTTP
            timeoutSeconds: 1
            periodSeconds: 10
            successThreshold: 1
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /
              port: exporter-port
              scheme: HTTP
            timeoutSeconds: 1
            periodSeconds: 10
            successThreshold: 1
            failureThreshold: 3
          terminationMessagePath: /dev/termination-log
          terminationMessagePolicy: File
          imagePullPolicy: IfNotPresent
      restartPolicy: Always
      terminationGracePeriodSeconds: 30
      dnsPolicy: ClusterFirst
      serviceAccountName: redis-e-rhqcz7-redis-exporter
      serviceAccount: redis-e-rhqcz7-redis-exporter
      securityContext: {}
      schedulerName: default-scheduler
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 25%
      maxSurge: 25%
  revisionHistoryLimit: 10
  progressDeadlineSeconds: 600　

二、与 Prometheus 集成

与 Prometheus 的配置文件 prometheus.yaml 中的 static_configs 模块内，继续追加配置内容来采集 redis_exporter 提供的数据。添加的参考配置内容如下：

scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: "prometheus"
 
    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.
 
    static_configs:
      - targets: ["localhost:9090"]
     
  - job_name: "node_exporter"
    static_configs:
      - targets: ["192.168.2.121:9100"]
 
  - job_name: "mysqld_exporter"
    scrape_interval: 10s
    static_configs:
      - targets: ["192.168.2.121:9104"]
 
  - job_name: "redis_exporter"
    scrape_interval: 10s
    static_configs:
      - targets: ["192.168.2.121:9121"] 