Claude Code storage

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

Error: ENOSPC: no space left on device OSError: [Errno 28] No space left on device Disk quota exceeded write ENOSPC Failed to write WAL: disk full
Error: ENOSPC: no space left on deviceOSError: [Errno 28] No space left on deviceDisk quota exceededwrite ENOSPCFailed to write WAL: disk full

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

  1. Always clean up in a finally block — Wrap file operations in try/finally (or use Python's tempfile.NamedTemporaryFile with delete=True)
  2. Use streaming instead of temp files — Pipe data between transforms without writing intermediate files to disk
  3. Implement a cleanup cron job — Schedule a task to delete files in /tmp older than 1 hour
  4. Set tmpwatch or systemd-tmpfiles — Configure OS-level cleanup of temp directories on a schedule
  5. Monitor disk usage — Set up alerts for disk usage above 80% to catch accumulation before it causes outages

Real developers can help you.

Sage Fulcher Sage Fulcher Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them) hanson1014 hanson1014 Full-stack developer experienced in fixing and deploying AI-generated apps from Lovable, Bolt.new, Cursor, and Replit. I specialize in debugging Supabase integration issues (auth flows, RLS policies, database connections), fixing broken deployments, resolving routing/blank screen problems, and cleaning up messy React/Vite codebases. I also build production apps with the Claude API and have shipped a Mac desktop dev tool (Nexterm from scratch. Based in Hong Kong, fast turnaround. David Olverson David Olverson Solo dev shipping production apps with AI-assisted development. I specialize in rescuing broken Lovable/Bolt/Cursor builds and taking them to production. 10+ apps shipped including SaaS CRMs, gaming platforms, real estate tools, and Discord bots. Stack: Next.js 16, TypeScript, Tailwind CSS, FastAPI, PostgreSQL, Prisma. I use Claude Code with 50+ custom skills for rapid delivery. Average turnaround: 2-4 weeks from broken prototype to production. Vlad Temian Vlad Temian 15+ years shipping production infrastructure for startups. Former CTO at qed.builders (acquired by The Sandbox). Cursor ambassador and agentic tooling builder. I've scaled systems, automated deployments, and built observability tools for AI coding workflows. I specialize in taking vibe-coded apps from broken prototype to production-ready: fixing Supabase auth/RLS, Stripe integrations, deployment pipelines, and cleaning up AI-generated spaghetti. I build tools in this space (agentprobe, claudebin, micode) and understand both sides: how AI generates code and why it breaks. https://blog.vtemian.com/ Yovel Cohen 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. Victor Denisov Victor Denisov Developer Omar Faruk Omar Faruk As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience. My work spanned building and refining core features, developing dynamic website templates, integrating secure and reliable payment gateways, and optimizing the overall system architecture. I played a key role in creating a scalable and maintainable platform to support educators and learners globally. I'm enthusiastic about embracing new challenges and making meaningful contributions. Milan Surelia Milan Surelia Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems. Expertise: 💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web. 🖋️ Sharing insights through technical writing, blogging, and open-source contributions. 🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences. Notable Achievements: 🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX. 🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development. 🌟 Open source contributions on Github & StackOverflow for Flutter & Dart 🎖️ Worked on improving app performance and user experience with smart solutions. Milan is always happy to connect, work on new ideas, and explore the latest in technology. Dor Yaloz Dor Yaloz SW engineer with 6+ years of experience, I worked with React/Node/Python did projects with React+Capacitor.js for ios Supabase expert PawelPloszaj PawelPloszaj I'm fronted developer with 10+ years of experience with big projects. I have small backend background too

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Frequently 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.

Related Claude Code Issues

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