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The Spring Boot Redis Rate Limiter requires a Redis instance to store rate limit counters. This guide shows you how to set up Redis for local development and production.

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Prerequisites

The rate limiter uses Spring Data Redis and automatically configures itself when it detects a StringRedisTemplate bean. You need to add the Spring Data Redis dependency to your project:
pom.xml
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

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Local development with Docker

The fastest way to run Redis locally is using Docker: 
docker run -d \
  --name redis-ratelimiter \
  -p 6379:6379 \
  redis:7.2-alpine
Then configure your application to connect to it: 
spring.data.redis.host=localhost
spring.data.redis.port=6379

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Docker Compose

For a more complete local setup, use Docker Compose:
docker-compose.yml
version: '3.8'

services:
  redis:
    image: redis:7.2-alpine
    container_name: redis-ratelimiter
    ports:
      - "6379:6379"
    volumes:
      - redis-data:/data
    command: redis-server --appendonly yes
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 10s
      timeout: 5s
      retries: 3

  app:
    build: .
    depends_on:
      redis:
        condition: service_healthy
    environment:
      - SPRING_DATA_REDIS_HOST=redis
      - SPRING_DATA_REDIS_PORT=6379
    ports:
      - "8080:8080"

volumes:
  redis-data:
Start the services: 
docker-compose up -d
When running in Docker Compose, set the Redis host to the service name (redis) instead of localhost.

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Spring Data Redis configuration

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Basic connection

# Redis server connection
spring.data.redis.host=localhost
spring.data.redis.port=6379
spring.data.redis.password=
spring.data.redis.database=0

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Connection pool (Lettuce)

The rate limiter uses Lettuce (the default Spring Data Redis client). Configure connection pooling for better performance: 
# Lettuce connection pool
spring.data.redis.lettuce.pool.enabled=true
spring.data.redis.lettuce.pool.max-active=8
spring.data.redis.lettuce.pool.max-idle=8
spring.data.redis.lettuce.pool.min-idle=2
spring.data.redis.lettuce.pool.max-wait=-1ms

# Connection timeout
spring.data.redis.timeout=2000ms
Connection pooling requires commons-pool2 on the classpath. Add it as a dependency:
<dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-pool2</artifactId>
</dependency>

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Redis Cluster

For high availability, configure Redis Cluster: 
spring.data.redis.cluster.nodes=node1:6379,node2:6379,node3:6379
spring.data.redis.cluster.max-redirects=3
spring.data.redis.password=your-password

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Redis Sentinel

For automatic failover, configure Redis Sentinel: 
spring.data.redis.sentinel.master=mymaster
spring.data.redis.sentinel.nodes=sentinel1:26379,sentinel2:26379,sentinel3:26379
spring.data.redis.password=your-password

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Production configuration

For production environments, use a robust configuration with connection pooling, timeouts, and SSL: 
# Redis connection
spring.data.redis.host=redis.production.example.com
spring.data.redis.port=6380
spring.data.redis.password=${REDIS_PASSWORD}
spring.data.redis.database=0
spring.data.redis.ssl.enabled=true

# Connection pool
spring.data.redis.lettuce.pool.enabled=true
spring.data.redis.lettuce.pool.max-active=16
spring.data.redis.lettuce.pool.max-idle=8
spring.data.redis.lettuce.pool.min-idle=4
spring.data.redis.lettuce.pool.max-wait=5000ms

# Timeouts
spring.data.redis.timeout=3000ms
spring.data.redis.connect-timeout=3000ms

# Rate limiter configuration
ratelimiter.redis-key-prefix=prod:api:ratelimit
ratelimiter.fail-open=false
ratelimiter.metrics-enabled=true
Always use environment variables or secrets management for production credentials. Never commit passwords to version control.

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Testing the connection

You can verify your Redis connection is working by checking the Spring Boot actuator health endpoint: 
curl http://localhost:8080/actuator/health/redis
Or by running a simple test:
RedisConnectionTest.java
@SpringBootTest
class RedisConnectionTest {

  @Autowired
  private StringRedisTemplate redisTemplate;

  @Test
  void redisConnectionWorks() {
    redisTemplate.opsForValue().set("test-key", "test-value");
    String value = redisTemplate.opsForValue().get("test-key");
    assertThat(value).isEqualTo("test-value");
  }
}

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Redis key structure

The rate limiter stores counters in Redis using this key pattern: 
{redis-key-prefix}:{key}:{windowStartMillis}
For example, with the default prefix and a key of user:123: 
ratelimiter:user:123:1700000000000
Keys are automatically expired using Redis TTL based on the rate limit window duration plus a 1-second safety buffer.

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Monitoring Redis

Monitor your Redis instance to ensure the rate limiter is performing well: 
# Check current keys
redis-cli --scan --pattern "ratelimiter:*"

# Monitor commands in real-time
redis-cli MONITOR

# Check memory usage
redis-cli INFO memory

# Check connection stats
redis-cli INFO clients

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