#infrastructure
All articles tagged #infrastructure — practical guides from production experience.
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52 posts tagged #infrastructure · page 1 of 6
NGINX 502 Bad Gateway Under Load: Root Causes and Fixes
NGINX 502 errors under load are almost never a simple app crash. This guide covers the real root causes — connection backlog overflow, keepalive misconfiguration, ephemeral port exhaustion — with diagnostic commands and config fixes from production incidents.
Too Many Open Files Linux: Fix Guide
Fix 'too many open files' errors on Linux — increase file descriptor limits for processes and system-wide, diagnose FD leaks, and configure permanent limits for production services.
systemctl Service Not Starting: Complete Fix Guide
Fix systemctl service not starting — diagnose failed units, read exit codes, resolve dependency errors, and fix the most common reasons a Linux service won't start.
systemctl Restart Service Not Working: Fix Guide
Fix systemctl restart not working — diagnose failed units, read journal logs, handle dependency failures, and resolve the most common systemd service restart failures.
How to Search Text in Files Linux: grep Examples
Search text in files in Linux with grep — recursive search, regex patterns, context lines, count matches, and real-world log investigation examples.
How to Restart Network Service in Linux (All Distros)
Restart network service in Linux using systemctl, nmcli, and ip commands — covering Ubuntu, RHEL, Debian, and CentOS with real examples and what to do when restart fails.
Permission Denied Linux: Fix with chmod and chown
Fix 'permission denied' errors in Linux — read permission bits correctly, use chmod and chown safely, debug with ls -la and stat, and avoid common mistakes that break applications.
Nginx Rate Limiting Configuration: Practical Guide With Examples
Configure nginx rate limiting with limit_req_zone and limit_req — with real examples for API protection, login endpoints, and burst handling in production.
Linux sort Command: Real Usage Examples
Use the Linux sort command effectively — sort by column, numerically, by size, reverse order, deduplicate, and combine with other commands for real log and data analysis.