Best Fixes
Check current descriptor limits and inspect whether the application is leaking files, sockets, or watchers.
Raise limits only after confirming the workload truly needs more and the application behavior is healthy.
Error Fix
How to Fix 'Too many open files'
A practical guide for distinguishing app leaks from system descriptor limits.
This means the process or system hit a file descriptor limit. Sometimes the limit is too low. Sometimes the application is leaking descriptors or opening too many resources at once.
Avoid This
Do not treat every occurrence as a simple ulimit problem without checking for leaks.
Do not raise limits indefinitely as a substitute for fixing broken process behavior.
Save commands, add notes, and build a Cheatbook with the fixes you want to keep handy.