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on my small homeserver running Ubuntu 16.04 LTS I have run out of diskspace on my system disk root partition for some reason. The device is a 128Gb SSD with the following status:

df -h:

Dateisystem                       Größe Benutzt Verf. Verw% Eingehängt auf
udev                               3,8G       0  3,8G    0% /dev
tmpfs                              769M     12M  757M    2% /run
/dev/mapper/wuerfelchen--vg-root    22G     21G  403M   99% /
tmpfs                              3,8G    8,0K  3,8G    1% /dev/shm
tmpfs                              5,0M       0  5,0M    0% /run/lock
tmpfs                              3,8G       0  3,8G    0% /sys/fs/cgroup
/dev/sda2                          473M    246M  203M   55% /boot
/dev/sda1                          511M    3,6M  508M    1% /boot/efi
/dev/mapper/wuerfelchen--vg-homes   87G    541M   82G    1% /home
tmpfs                              769M       0  769M    0% /run/user/1000

sudo du -hsx /* | sort -rh | head -n 40:

12G /root
3,7G    /usr
3,6G    /var
1,1G    /lib
485M    /home
260M    /opt
244M    /boot
125M    /home_old
16M /bin
14M /sbin
12M /run
12M /etc
132K    /tmp
32K /mnt
16K /media
16K /lost+found
8,0K    /snap
8,0K    /export
4,0K    /srv
4,0K    /lib64
4,0K    /dead.letter

So, I can see, the folder /root is using 12G of the total 22G partition size, but I can't access the folder. What data is kept inside there? Can I check that somehow?

Thanks for help in advance!

sandman

sandman85
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    the /root directory holds user data for the root user. normally it should never reach that huge size (on my system it is only 2.3M). can you tell us what sudo du -h /root says? – ashvatthama Jun 18 '20 at 12:32
  • /home is only 1% full of 82GB. Whoever root is (you maybe?) should store their files in their home directory and not /root. – Brian Richardson Jun 18 '20 at 12:50
  • Please add the output of lsblk -fs; sudo fdisk -l /dev/sda. Are you using 18.10? This or this might help you. If you need to make some space you can use ncdu. – Pablo Bianchi Jun 18 '20 at 17:16

2 Answers2

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sudo du -h /root

gives me the following:

root@wuerfelchen:/# sudo du -h /root 
8,0K    /root/.ssh
8,0K    /root/.config/Duplicati/control_dir_v2
12G /root/.config/Duplicati
12G /root/.config
8,0K    /root/.nano
12G /root

So there seems to be a bug with Duplicati... But I have no idea why duplicati is able to read and write to /root...

EDIT: As Duplicati is running as a deamon, the default behaviour of duplicati is to store its backup database to /root/.config/Duplicati. The solution is to move the database to a different place: https://forum.duplicati.com/t/how-to-change-the-local-database-file-location/1394

sandman85
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It seems you have root access, so a simple sudo bash should get you a root shell and you can simply cd /root and ls to have a look. If you don't own the files in /root you should probably find out who does before moving them :)

Brian Richardson
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  • Thanks for the answer... It's getting strange somehow. There seem to be no files or direcotries in /root root@wuerfelchen:/root# ls -l insgesamt 0 – sandman85 Jun 18 '20 at 16:39
  • the files are all in hidden folders (first character is a '.'), so they won't show up without the -a flag to ls. ls -la will show you the hidden files. – Brian Richardson Jun 19 '20 at 00:48