localhost:6379

Port 6379 is Redis — the blazing fast in-memory data store. Used for caching, session storage, message queues, and real-time analytics. If your app needs speed, Redis on 6379 is likely involved.

Connect to Redis

Redis CLI

# Connect
redis-cli

# Or specify host/port
redis-cli -h localhost -p 6379

# Test connection
127.0.0.1:6379> PING
PONG

# Set and get
127.0.0.1:6379> SET mykey "Hello"
OK
127.0.0.1:6379> GET mykey
"Hello"

Connection Strings

# Standard format
redis://localhost:6379

# Node.js (ioredis)
const Redis = require('ioredis');
const redis = new Redis(6379, 'localhost');

# Python
import redis
r = redis.Redis(host='localhost', port=6379, db=0)

# PHP
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

Check if Redis is Running

# Linux
sudo systemctl status redis

# Mac (Homebrew)
brew services list | grep redis

# Docker
docker ps | grep redis

# Test connection
redis-cli ping

Common Errors

Start Redis

# Linux
sudo systemctl start redis

# Mac
brew services start redis

# Docker
docker run -d -p 6379:6379 redis

# Manual
redis-server

Related Ports