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"]