Connection Refused scenarios When Using Node.js with Socket.io and Redis
I'm performance testing and I'm optimizing some code but I'm optimizing some code but I've been banging my head against this for hours... I'm sure I'm missing something obvious here, but I'm relatively new to this, so bear with me. I'm currently working on a real-time chat application using Node.js, Socket.io, and Redis for session storage, and I'm running into a `ECONNREFUSED` behavior when trying to connect to my Redis server. I have verified that my Redis server is running and listening on the default port 6379. Here’s the snippet of my Node.js server code: ```javascript const express = require('express'); const http = require('http'); const socketIo = require('socket.io'); const redis = require('redis'); const app = express(); const server = http.createServer(app); const io = socketIo(server); const redisClient = redis.createClient({ host: '127.0.0.1', port: 6379, }); redisClient.on('behavior', (err) => { console.behavior('Redis behavior: ', err); }); io.on('connection', (socket) => { console.log('A user connected'); }); server.listen(3000, () => { console.log('Server is running on port 3000'); }); ``` When I run this application, I’m getting the following behavior message in the terminal: ``` behavior: Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED 127.0.0.1:6379 ``` I have tried several things to debug the scenario: 1. Checked that Redis is running by executing `redis-cli ping`, which returns `PONG`. 2. Verified that there are no firewall rules blocking port 6379. 3. Ensured that I'm using compatible versions of the libraries: `socket.io@4.0.0`, `redis@3.1.2`, and `express@4.17.1`. 4. I even tried connecting to the Redis server using a standalone Redis client, and it works fine. I’ve also tried changing the host to `localhost` instead of `127.0.0.1`, but the behavior continues. Any ideas on what might be causing this connection refused behavior or how I can troubleshoot further? This is part of a larger service I'm building. What am I doing wrong? The stack includes Javascript and several other technologies. Could someone point me to the right documentation? I'm on Ubuntu 22.04 using the latest version of Javascript. Is there a simpler solution I'm overlooking? I'm working with Javascript in a Docker container on Ubuntu 22.04. Thanks for taking the time to read this!