Prometheus增加Redis监控指标

一 官方文档

redis-exporter的GitHub地址(包含部署参数、指标明细说明等)：https://github.com/oliver006/redis_exporter

二 安装redis-exporter

通过一下yaml文件安装 kubectl apply -f redis-exporter-deployment.yaml

redis-exporter-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-exporter-cluster
  namespace: kube-system
  labels:
    k8s-app: redis-exporter-cluster
spec:
  selector:
    matchLabels:
      k8s-app: redis-exporter-cluster
  template:
    metadata:
      labels:
        k8s-app: redis-exporter-cluster
    spec:
      containers:
      - name: redis-exporter-cluster
        image: oliver006/redis_exporter:v1.37.0
        args: ["-redis.addr", "redis://10.0.43.243:6379,redis://10.0.43.244:6379,redis://10.0.43.245:6379,redis://10.0.43.246:6379,redis://10.0.43.247:6379,redis://10.0.43.248:6379"]
        livenessProbe:
          failureThreshold: 1
          httpGet:
            path: /health
            port: 9121
            scheme: HTTP
          initialDelaySeconds: 3
          periodSeconds: 30
          successThreshold: 1
          timeoutSeconds: 9
        readinessProbe:
          failureThreshold: 1
          httpGet:
            path: /health
            port: 9121
            scheme: HTTP
          initialDelaySeconds: 3
          periodSeconds: 15
          successThreshold: 1
          timeoutSeconds: 9
        ports:
        - containerPort: 9121
          name: http

---
apiVersion: v1
kind: Service
metadata:
  name: redis-exporter-cluster
  namespace: kube-system
spec:
  ports:
    - name: http
      port: 9121
      protocol: TCP
  selector:
    k8s-app: redis-exporter-cluster

prometheus的configmap增加配置如下：

- job_name: 'redis_cluser_targets'
  static_configs:
    - targets:
      - redis://10.0.43.243:6379
      - redis://10.0.43.244:6379
      - redis://10.0.43.245:6379
      - redis://10.0.43.246:6379
      - redis://10.0.43.247:6379
      - redis://10.0.43.248:6379
  metrics_path: /scrape
  relabel_configs:
    - source_labels: [__address__]
      target_label: __param_target
    - source_labels: [__param_target]
      target_label: instance
    - target_label: __address__
      replacement: redis-exporter-cluster:9121

再通过命令 curl -XPOST http://[prometheus-host]:9090/-/reload 刷新Prometheus配置。

如果不想在Prometheus中增加configmap配置，也可在redis-exporter的yaml文件中增加以下annotation，通过同一个k8s中部署的Prometheus的监控配置服务发现自动发现。

spec:
  template:
    metadata:
      annotations:
        prometheus.io/scrape: "true"