Linux Disk Space Troubleshooting is a valuable topic for IT professionals who manage Linux systems, web servers, cloud instances, virtual machines, and production services. This tutorial gives practical steps, command examples, and safe administration guidance.
- Learn the concept in practical language
- Understand common production symptoms
- Use Linux commands safely
- Apply troubleshooting and security best practices
Why disk space issues are serious
When a Linux server runs out of disk space, applications may fail, databases may stop writing, logs may disappear, and users may experience outages.
Check filesystem usage with df
df shows mounted filesystems and how much space is used. Start here to identify which partition is full.
Find large directories with du
du helps locate the folders consuming the most space. Common locations include /var/log, /var/lib, backups, uploads, and application directories.
Be careful with deletion
Do not delete random files. Understand what the file is, whether an application is using it, and whether retention rules apply.
Prevent future issues
Use log rotation, monitoring alerts, backup retention policies, and regular capacity reviews.
Useful Linux commands
df -h
du -sh /var/* | sort -h
journalctl --disk-usage
sudo journalctl --vacuum-time=7d
sudo apt cleanSafe server administration checklist
- Check the current state before making changes.
- Back up important files and configuration.
- Test commands in a lab or staging server when possible.
- Make one change at a time and verify the result.
- Document the issue, commands used, and final fix.
Educational note: This tutorial is for learning purposes. Test commands carefully and do not apply changes to production systems without authorization, backups, and a rollback plan.
