NGINX 502 Bad Gateway: Causes and Fixes
Why NGINX returns 502 Bad Gateway — upstream timeouts, wrong upstream addresses, FastCGI/PHP-FPM failures, plus SELinux gotchas, with fixes.
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You’ll find product updates, tips & tricks, tutorials and more. Please take a moment to have a look at our most popular posts below.
A few of our latest posts
Dockerize a Node.js App: A Production‑Ready Walkthrough
Dockerize a Node.js app with a production-ready multi-stage Dockerfile — non-root user, proper signal handling, layer caching, and deploy integration.
Essential Linux Server Commands for Deployment
Disk space, memory, processes, logs — the Linux server commands you reach for before, during, and after every deployment, plus a health-check script.
How to Check Your Ubuntu (or Any Linux) Version from the Command Line
Check your Ubuntu or Linux version from the command line with lsb_release, /etc/os-release, or hostnamectl. Reference + when to use each.
Choosing a Linux Distro for Production Deployments: Ubuntu, Debian, AlmaLinux, RHEL
Ubuntu, Debian, AlmaLinux, or RHEL? Pick the right Linux distribution for production servers based on support windows, packages, and deployability.