Using a systemd path unit to clean my home server’s cache when disk space hits 90%

Wed, 14 Oct 2026 10:01:46 +0200

When the disk is almost full

I’ve run a handful of home‑servers for years, and the first thing that usually trips you up is a suddenly full disk.
Caches from apt, Docker, Flatpak, and the like can balloon without you noticing.
A quick, automated cleanup that only kicks in when the root filesystem is >90 % used keeps the system sane without you having to remember to run a script every week.

Cache on Linux Café

Using a systemd path unit to clean my home server’s cache when disk space hits 90%

When the disk is almost full