Linux Disk Space Troubleshooting: df, du, Logs and Cleanup Best Practices

Linux Disk Space Troubleshooting is a practical topic for IT professionals, help desk engineers, system administrators and server support teams. This tutorial explains the concept clearly and gives commands you can practice in a safe Linux lab.

Why disk space issues are dangerous

When a server runs out of disk space, websites, databases, logs and package updates can fail. Disk alerts should be treated seriously.

Start with df

df -h shows which filesystem is full. This helps identify whether the issue is root, home, var, boot or another mounted disk.

Find large folders with du

du helps identify large directories. Start broad, then drill down carefully to avoid deleting important application data.

Logs and journal files

Logs are common causes of disk growth. Use logrotate and journalctl cleanup rather than blindly deleting active log files.

Safe cleanup approach

Take backups when needed, confirm what each file is, clean package caches, rotate logs and avoid deleting database files or application uploads accidentally.

Useful Linux commands

df -h
du -sh /var/log/*
sudo journalctl --disk-usage
sudo journalctl --vacuum-time=7d
sudo apt clean

Server administration checklist

• Test commands in a lab before using them on production servers.
• Check logs and current configuration before making changes.
• Take backups before risky operations.
• Document what you changed and why.
• Verify the service after every change.

Final thoughts

Linux server administration becomes easier when you follow a structured process. Learn the commands, understand the risk, and practice regularly in a safe environment.

Educational note: This tutorial is for learning purposes only. Test carefully and do not make production changes without approval, documentation and backups.