this post was submitted on 30 Sep 2025
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df showing a full (99%) ssd, but du only showing a fraction of that? UPDATED (lemy.lol)
submitted 3 days ago* (last edited 2 days ago) by flork@lemy.lol to c/linux@lemmy.ml
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I noticed the root drive of my home server (Debian) is at 99% capacity, which was odd to be because I don't store anything on the root ssd. sudo df -h confirms that 99% of my 256gb drive is full. But sudo du -sh * all added up, only comes to about 30gb.

This is a pc that only runs docker containers and one virtual machine for home assistant. And yes I have restarted, Any ideas as to how to find the missing 200+ gigabytes?

EDIT: sudo ncdu allowed me to find a 72gb [long string of characterless]-json.log file in /var/lib/docker/containers and many 1gb+ files in /var/lib/docker/overlay2. I'm not sure what to do with this information (or what's safe to delete) but I'm getting somewhere.

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[–] drhoopoe@lemmy.sdf.org 4 points 3 days ago (1 children)

Docker containers can eat a lot of space over time. When's the last time you did a docker system prune? Be sure to read up on what it does before you try it.

[–] flork@lemy.lol 2 points 2 days ago

Thanks that allowed me to clear up about 20GB! Also sudo ncdu allowed me to find a 72gb [long string of characterless]-json.log file and many 1gb+ files in /var/lib/docker/overlay2. I'm not sure what to do with this information or if it's safe to delete but at least I'm getting somewhere.