Linux Disk Space Troubleshooting: df, du, lsblk and Log Cleanup Guide

Linux Disk Space Troubleshooting is a practical skill for IT professionals who manage Linux systems, websites, cloud servers, virtual machines or internal infrastructure. This tutorial explains the topic clearly and gives commands you can practice safely.

Why disk space issues are serious

Full disks can stop databases, break websites, block logins, fail backups and prevent services from writing logs or temporary files.

Start with df

df shows filesystem usage. It tells you which partition is full, such as /, /var, /home or /boot.

Find large folders with du

du helps identify which directory is consuming space. Use it carefully because scanning large filesystems can take time.

Check block devices with lsblk

lsblk shows disks, partitions and mount points. It helps you understand where storage is attached and mounted.

Safe cleanup approach

Do not randomly delete files. Check logs, package caches, old backups, temporary files and application data. Always confirm what owns the file before removing it.

Useful commands

df -h
du -sh /var/* 2>/dev/null | sort -h
lsblk
journalctl --disk-usage
sudo journalctl --vacuum-time=7d
sudo apt clean

Best practices for IT professionals

• Test commands in a lab before using them on production servers.
• Take notes before making changes so you can roll back if needed.
• Check logs before restarting services.
• Use least privilege instead of running everything as root.
• Document fixes for future troubleshooting.

Final thoughts

Linux and server administration become easier when you build a repeatable troubleshooting process. Practice these commands regularly and connect each command to a real operational problem.

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