Redis
What is Port 6379?
Port 6379 is the default port for Redis, an in-memory data structure store used as a database, cache, message broker, and queue. Created by Salvatore Sanfilippo in 2009, Redis is known for its exceptional performance — capable of handling millions of operations per second. Redis supports rich data structures including strings, hashes, lists, sets, sorted sets, bitmaps, hyperloglogs, and streams. It's used as a caching layer by virtually every major web application to reduce database load and improve response times. Redis is also used for session storage, real-time leaderboards, pub/sub messaging, rate limiting, and job queues (via Sidekiq, Bull, Celery). Cloud-managed versions include AWS ElastiCache, Azure Cache for Redis, and Redis Cloud.
Common Uses
- Application caching layer for performance
- Session storage for web applications
- Real-time pub/sub messaging
- Job queue and background task processing
- Rate limiting and counter implementation
Technical Details
Copy-paste commands to check port 6379 (Redis) from your terminal
Test connectivity
nc -zv example.com 6379
curl -v --max-time 5 http://example.com:6379/
telnet example.com 6379
nmap -p 6379 -sV example.com
(echo > /dev/tcp/example.com/6379) 2>/dev/null && echo "open" || echo "closed"
Open port in firewall
sudo ufw allow 6379/tcp
sudo iptables -A INPUT -p tcp --dport 6379 -j ACCEPT
sudo firewall-cmd --permanent --add-port=6379/tcp && sudo firewall-cmd --reload
Security Considerations
Redis with no authentication has been massively exploited — attackers write SSH keys or cron jobs to gain server access. ALWAYS set a strong password with requirepass. Use ACLs (Redis 6+) for fine-grained access control. Enable TLS for encrypted connections. Bind to 127.0.0.1 or use firewall rules. Disable dangerous commands (FLUSHALL, CONFIG) in production. Never expose Redis to the internet.
Popular Ports Reference
The most commonly used and referenced network ports