Senior LevelNode JS
How do UNIX Domain Sockets achieve 40% lower latency than TCP loopback for IPC communication?
❓ Interview Prompt: Explain UNIX Domain Sockets (`/tmp/app.sock`), IPC communication, bypassing TCP/IP stack overhead, and NGINX proxy integration.
When routing traffic between an NGINX reverse proxy and a local Node.js app, connecting over TCP ('localhost:3000') incurs TCP 3-way handshake and checksum overhead.
UNIX Domain Sockets ('server.listen('/tmp/app.sock')'):
Bypasses the entire TCP/IP network layer and routing tables in the Linux kernel, transferring data directly through kernel memory buffers for 40% lower latency!
Code Implementation Example
javascript
import http from 'node:http';
import fs from 'node:fs';
const socketPath = '/tmp/node_app.sock';
// Unlink stale socket file if it exists
if (fs.existsSync(socketPath)) fs.unlinkSync(socketPath);
const server = http.createServer((req, res) => {
res.end('Response over UNIX Domain Socket!');
});
server.listen(socketPath, () => {
console.log('Server listening on UNIX Domain Socket: ${socketPath}');
});💡Binding a Node.js HTTP server to a UNIX Domain Socket file path.
🎯 Interview Key Takeaway
Use UNIX Domain Sockets for local IPC and NGINX reverse proxies to bypass TCP network stack overhead.
#UNIX Sockets#IPC#Performance#Networking#Senior
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