Deploying Redis Exporter with Docker‑Compose and Configuring Prometheus Monitoring and Alerts

This guide explains how to deploy the redis_exporter service using Docker‑Compose, then configure Prometheus to scrape its metrics and create alert rules for Redis monitoring.

Docker‑Compose file (docker-compose.yaml) :

version: '3.3'
services:
  redis_exporter:
    image: oliver006/redis_exporter
    container_name: redis_exporter
    restart: always
    environment:
      REDIS_ADDR: "192.168.18.69:6379"
      REDIS_PASSWORD: 123456
    ports:
      - "9121:9121"
EOF

Create the file with cat >docker-compose.yaml <<EOF and start the container in detached mode: docker-compose up -d Prometheus configuration (prometheus.yml) to scrape the exporter:

- job_name: 'redis_exporter'
  static_configs:
    - targets: ['192.168.18.69:9121']
  labels:
    instance: test服务器
EOF

Reload the Prometheus configuration: curl -X POST http://localhost:9090/-/reload Redis alert rules (prometheus/rules/redis.yml) :

groups:
- name: redis
  rules:
  - alert: RedisDown
    expr: redis_up == 0
    for: 0m
    labels:
      severity: critical
    annotations:
      summary: 'Redis Down,实例:{{ $labels.instance }}'
      description: "Redis实例 is down"
  - alert: RedisMissingBackup
    expr: time() - redis_rdb_last_save_timestamp_seconds > 60 * 60 * 24
    for: 0m
    labels:
      severity: critical
    annotations:
      summary: "Redis备份丢失,实例:{{ $labels.instance }}"
      description: "Redis 24⼩时未备份"
  - alert: RedisOutOfConfiguredMaxmemory
    expr: redis_memory_used_bytes / redis_memory_max_bytes * 100 > 90
    for: 2m
    labels:
      severity: warning
    annotations:
      summary: "Redis超出配置的最⼤内存,实例:{{ $labels.instance }}"
      description: "Redis内存使⽤超过配置最⼤内存的90%"
  - alert: RedisRejectedConnections
    expr: increase(redis_rejected_connections_total[1m]) > 0
    for: 0m
    labels:
      severity: critical
    annotations:
      summary: "Redis有拒绝连接,实例:{{ $labels.instance }}"
      description: "与Redis 的某些连接被拒绝{{ $value }}"
EOF

Verify the Prometheus configuration:

docker exec -it prometheus promtool check config /etc/prometheus/prometheus.yml

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