Monitoring Redis Dengan redis_exporter

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Tools yang Saya Gunakan

1. Dockprom

2. Docker

3. redis_exporter

How To

1. Setup redis_exporter, buat file docker-compose.yml

version: '3'

services:
  redis-exporter:
    image: oliver006/redis_exporter:latest
    restart: always
    depends_on:
      - redis
    container_name: redis_exporter
    environment:
      #use this you use redis with same docker-compose with this exporter
      #REDIS_ADDR: redis://redis:6379
      REDIS_ADDR: redis://192.168.1.2:6379
      REDIS_PASSWORD: passREDISkamu
    ports:
      - "9121:9121"

Jalankan docker-compose up -d. Untuk mengecek apakah exporter sudah berhasil dijalankan, gunakan docker logs -f redis-exporter

3. Selanjutnya, tambahkan job baru di file prometheus.yml

  - job_name: redis-exporter
    honor_labels: true
    honor_timestamps: true
    scrape_interval: 30s
    scrape_timeout: 30s
    metrics_path: /metrics
    scheme: http
    follow_redirects: true
    enable_http2: true
    static_configs:
    - targets:
      #redis_exporter server
      - 192.168.1.3:9121

Restart container prometheus docker restart prometheus

4. Tambahkan rules redis baru di prometheus

wget https://raw.githubusercontent.com/samber/awesome-prometheus-alerts/master/dist/rules/redis/oliver006-redis-exporter.yml -O redis-exporter.rules

5. Masuk ke grafana dashboard, import JSON dashboard 763 (entah kenapa ga tersedia di grafana.com)

Beberapa Permasalahan & Solusinya

1. Redis is Running Out of Configured Memory

   Ini agak aneh, karena di sana di tulis maxmemory nya infinity/unlimited. Alert ini bisa hilang dengan cara menetapkan maxmemory di redis config

   #maxmemory, default infinity
   config get maxmemory
   config set maxmemory 3GB
   

Solusinya di redis, kita bisa menambahkan maxclient
```
#maxclient, defaul 10000
config get maxclients
config set maxclients 20000
```

Referensi:

Awesome Prometheus alerts - redis

Prometheus Redis Metrics Exporter