OSError: No Space Left on Device

Why This Happens

This error occurs when the filesystem has no free space. Common causes include large log files, temporary files not cleaned up, and Docker images filling the disk.

The Problem

with open('output.log', 'a') as f:
    while True:
        f.write('log entry\n')

The Fix

import logging
from logging.handlers import RotatingFileHandler
handler = RotatingFileHandler('output.log', maxBytes=10*1024*1024, backupCount=5)
logger = logging.getLogger()
logger.addHandler(handler)

Step-by-Step Fix

1. 1

   Check disk usage

   Run df -h and du -sh /path/*.

2. 2

   Clean up temp files

   Remove old logs and unused data.

3. 3

   Implement log rotation

   Use RotatingFileHandler to prevent unbounded growth.