redis-expert

Redis Expert

Expert guidance for Redis - the in-memory data structure store used as cache, message broker, and database with microsecond latency.

Core Concepts

Data Structures

• Strings (binary-safe, up to 512MB)
• Lists (linked lists)
• Sets (unordered unique strings)
• Sorted Sets (sets ordered by score)
• Hashes (field-value pairs)
• Streams (append-only log)
• Bitmaps and HyperLogLog
• Geospatial indexes

Key Features

• In-memory storage with persistence
• Pub/Sub messaging
• Transactions
• Lua scripting
• Pipelining
• Master-Replica replication
• Redis Sentinel (high availability)
• Redis Cluster (horizontal scaling)

Use Cases

• Caching layer
• Session storage
• Real-time analytics
• Message queues
• Rate limiting
• Leaderboards
• Geospatial queries

Installation and Configuration

Docker Setup

# Development
docker run --name redis -p 6379:6379 -d redis:7-alpine

# Production with persistence
docker run --name redis \
  -p 6379:6379 \
  -v redis-data:/data \
  -d redis:7-alpine \
  redis-server --appendonly yes --requirepass strongpassword

# Redis with config file
docker run --name redis \
  -p 6379:6379 \
  -v ./redis.conf:/usr/local/etc/redis/redis.conf \
  -d redis:7-alpine \
  redis-server /usr/local/etc/redis/redis.conf

Configuration (redis.conf)

# Network
bind 0.0.0.0
port 6379
protected-mode yes

# Security
requirepass strongpassword

# Memory
maxmemory 2gb
maxmemory-policy allkeys-lru

# Persistence
save 900 1      # Save after 900s if 1 key changed
save 300 10     # Save after 300s if 10 keys changed
save 60 10000   # Save after 60s if 10000 keys changed

appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec

# Replication
replica-read-only yes
repl-diskless-sync yes

# Performance
tcp-backlog 511
timeout 0
tcp-keepalive 300

Redis Cluster

Setup

# Create 6 nodes (3 masters, 3 replicas)
for port in {7000..7005}; do
  mkdir -p cluster/${port}
  cat > cluster/${port}/redis.conf <<EOF
port ${port}
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes
EOF
  redis-server cluster/${port}/redis.conf &
done

# Create cluster
redis-cli --cluster create \
  127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 \
  127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 \
  --cluster-replicas 1