#troubleshooting
All articles tagged #troubleshooting — practical guides from production experience.
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68 posts tagged #troubleshooting · page 8 of 8
Linux TIME_WAIT Explained: Why It Causes Connection Failures and How to Fix It
Linux TIME_WAIT exhausts ephemeral ports and causes ECONNREFUSED under load — even when your app is healthy. Learn what TIME_WAIT is, how to detect port exhaustion with ss and netstat, and the exact sysctl fixes that resolve it.
NGINX Upstream Keepalive Explained: Why Missing It Causes 502 Errors
Missing keepalive in your NGINX upstream block silently kills connections under load. Here's exactly what keepalive does, how TCP connection reuse works, and the production-ready config that stops 502s before they start.
Docker Ate My Disk: Fixing Log Rotation Before It Kills Production
How a single verbose container filled a 500GB disk in 72 hours, and the exact daemon.json config that stops it from ever happening again.
Reading Logs Like a Detective: A Field Guide to Incident Triage
The exact commands and mental models I use to go from 'something is wrong' to 'I know exactly what happened' in under 15 minutes.
strace, lsof, and ss: The Trio That Solves Every Mystery
When logs give you nothing and the debugger isn't an option, these three tools let you see exactly what a running process is doing at the system call level.