No more disk space

Today I was about to read my news from the RSS but an empty page with some errors showed up. I then ssh to the PI and quickly discovered the disk space was running out.

Some commands to find biggest offenders:

Disk space human readable: df -h
40 biggest files in this folder and subfolders: du -ah . | grep -v "/$" | sort -rh | head -n 40
10 biggest folders from root folder: sudo du -aBm / 2>/dev/null | sort -nr | head -n 10
systemd journal logs not used anymore: journalctl --disk-usage
List of installed packages: apt list --installed

Some commands to clear some space:

Clear apt cache: sudo apt-get clean
Remove packages not used: sudo apt-get autoremove
Remove docker things not used by any active container (run it only when your stack is up and running): docker system prune -a -f
Remove some journal logs: sudo journalctl --vacuum-time=3d

After this quick exercise this is the result:

File system     Dim. Usati Dispon. Uso% Montato su
/dev/root       7,0G  6,0G    645M  91% /