Dockerization

Dockerize Redis: Persistence, Auth, and Memory Limits Done Right

Redis in Docker with default settings means no persistence, no authentication, and no memory limit — a single container restart wipes your cache, and any process on the network can connect. We configure Redis containers with AOF persistence, requirepass authentication, maxmemory policies, and optional Sentinel for high availability.

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Why Dockerize Redis

The official Redis Docker image runs with no password, no persistence, and no memory limit. In development that is fine. In production, it means a container restart loses all data, any application on the Docker network can read your sessions, and Redis can consume all available memory until the OOM killer strikes.

Proper Dockerization means configuring requirepass, enabling AOF and/or RDB persistence, setting maxmemory with an eviction policy, and mounting data on a persistent volume.

Our Docker Implementation for Redis

Production Redis Compose stack:

  • Redis container: FROM redis:7-alpine — custom redis.conf with requirepass, maxmemory 512mb, maxmemory-policy allkeys-lru, appendonly yes, appendfsync everysec. Data volume at /data.
  • Sentinel (optional): Three Sentinel containers for automatic failover in HA setups. Each monitors the master and promotes a replica if the master goes down.

Health check: redis-cli -a $REDIS_PASSWORD ping | grep PONG. The Compose file sets sysctls for net.core.somaxconn=511 and disables Transparent Huge Pages warnings. Logging configured with loglevel notice.

What You Get

  • docker-compose.yml with Redis, persistent volume, and optional Sentinel
  • Custom redis.conf with auth, persistence, and memory limits
  • AOF + RDB dual persistence for data safety
  • Health check verifying Redis accepts authenticated connections
  • Sysctl tuning for container networking
  • Optional Redis Exporter for Prometheus monitoring

Why Anubiz Engineering

100% async — no calls, no meetings
Delivered in days, not weeks
Full documentation included
Production-grade from day one
Security-first approach
Post-delivery support included

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