WordPress
Troubleshoot WordPress Cache Layers When Visitors See Stale Pages
Troubleshoot WordPress cache layers when visitors see stale pages
EAST4SERV / TECHNICAL PUBLICATION
Troubleshooting
Practical field notes, guides and operational context.
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8 articlesTroubleshooting
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Windows Server
Diagnose a Windows Server Service That Fails to Start
Diagnose a Windows Server service that fails to start
Networking
Diagnose Linux Network Problems with ss, dig and traceroute
Diagnose Linux network problems with ss, dig and traceroute
Troubleshooting
Diagnose Linux Memory Pressure and OOM Kills
An application killed by the Linux out-of-memory mechanism is an outcome, not a diagnosis. The cause may be a genuine rise in workload demand, a memory leak, an overly small contai...
Linux Administration
Diagnose a systemd Service That Fails After Reboot
A service that runs when an engineer starts it but disappears after a reboot is usually an ordering, enablement, environment, or application-startup problem. Repeatedly restarting...
Troubleshooting
Linux Disk Space Full: Diagnose Logs, Storage and Inodes
“No space left on device” can mean the filesystem has no free bytes, has no free inodes, is read-only, or has a quota limit. Deleting the largest visible file without finding the cause...
Troubleshooting
How to Investigate High CPU Usage on a Linux Server
High CPU is a symptom, not a diagnosis. A brief peak during a scheduled build or backup may be expected. Sustained saturation with rising request latency, failed health checks, or queue...
Troubleshooting
How to Fix Nginx 502 Bad Gateway and PHP-FPM Errors
An Nginx 502 Bad Gateway response means Nginx could not obtain a valid response from its upstream. On a PHP site, the upstream is often PHP-FPM, but the same status can arise from a TCP...