Temporary Files Accumulating and Filling Disk Space
Your application creates temporary files for processing (image transforms, PDF generation, CSV exports, file uploads) but never deletes them afterward. Over days or weeks, these orphaned files accumulate and eventually fill the disk, causing the application to crash or become unresponsive.
This is a silent issue that doesn't appear during development or testing because the files accumulate slowly. In production, you first notice it when the server runs out of disk space, uploads start failing, or the database can't write its WAL files.
The root cause is that Claude Code generated the file creation logic but didn't include cleanup logic, error handling that cleans up on failure, or a scheduled cleanup job.
Error Messages You Might See
Common Causes
- No cleanup after processing — Files are created in /tmp but fs.unlink() or os.remove() is never called after use
- Error paths skip cleanup — When processing fails with an exception, the temp file is never deleted because cleanup is in the success path only
- No try/finally block — File cleanup isn't in a finally block, so any thrown error leaves the file behind
- Missing cron job — No scheduled task to clean up files older than a certain age
- Unique filenames every request — Using UUID-based filenames means no overwriting of old files, just endless accumulation
How to Fix It
- Always clean up in a finally block — Wrap file operations in try/finally (or use Python's tempfile.NamedTemporaryFile with delete=True)
- Use streaming instead of temp files — Pipe data between transforms without writing intermediate files to disk
- Implement a cleanup cron job — Schedule a task to delete files in /tmp older than 1 hour
- Set tmpwatch or systemd-tmpfiles — Configure OS-level cleanup of temp directories on a schedule
- Monitor disk usage — Set up alerts for disk usage above 80% to catch accumulation before it causes outages
Real developers can help you.
MFox
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Richard McSorley
Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures.
Sage Fulcher
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zipking
I am a technologist and product builder dedicated to creating high-impact solutions at the intersection of AI and specialized markets. Currently, I am focused on PropScan (EstateGuard), an AI-driven SaaS platform tailored for the Japanese real estate industry, and exploring the potential of Archify.
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PawelPloszaj
I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
Rudra Bhikadiya
I build and fix web apps across Next.js, Node.js, and DBs.
Comfortable jumping into messy code, broken APIs, and mysterious bugs.
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Victor Denisov
Developer
Yovel Cohen
I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well.
Nam Tran
10 years as fullstack developer
Jaime Orts-Caroff
I'm a Senior Android developer, open to work in various fields
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Get HelpFrequently Asked Questions
How do I find what's filling my disk?
Run 'du -sh /tmp/* | sort -rh | head -20' to find the largest items in /tmp. Use 'df -h' to see overall disk usage. Check your app's upload and cache directories too.
How do I prevent temp file accumulation?
Use language-specific temp file APIs that auto-delete (Python's tempfile, Node's tmp library with cleanup option). Always delete in a finally block and add a cron job as a safety net.