Your production crashed because "no space left on device" and you have no guess what to delete fast? Do not worry! Here I will show you largest useless points of data and how to find and kill them.
☝ Save the post for future, it happens!
ncdu to check who uses space:
apt install ncdu
🤔 Yes, you will need ~100kB of free space to install
ncdu: just find some trash in your home directory
I suggest you not spend time now, and enter
/var/log folder instantly:
In most cases it is systemd's
journal folder and
Trim current large journal immediately:
😣 So, after several months of work our CI server had
3.6 GBof useless for us data created by OS default tools. Now it is empty.
Also let's force to trim it automatically when journal will exceed
50 M. To limit max used space for journal, open a config file:
🛌 Sleep better after doing it
btmp file in
This file most time contains logs of unsuccessful brute-force attempts. To remove file content on one time basis:
echo '' > /var/log/btmp
To fix it in future:
- add same command under daily CRON
fail2banor alternative to fix root cause of the issue and ban brute forcers earlier
Are you using docker?
One of the largest points of useless data.
Remove most of useless docker data:
docker system prune -f
Also you might want to remove unused images:
docker rmi $(docker images -f "dangling=true" -q)
👋 Stay clean and have a fun