- Date : 2017-08-06
- Tags : #sysadmin #linux #kernel
Last day, I try to reboot a production server which has out-of-space /boot (I upgraded many kernels without rebooting, so system doesn't clean up old ones). And in the end, doom day had come ! It installed new kernel failed and booting to that kernel. My system crashed !
So, I learned from it :
- Never ever upgrade kernel without cleaning up old ones (just reboot)
- Never ever reboot a production without backup
- MORE IMPORTANT, NEVER do 2 above things at same time in the weekend !!!
Solution :
-
Check current kernel :
uname -r -
List all kernels :
dpkg --list | grep linux-image -
Remove a kernel :
sudo apt-get purge linux-image-x.x.x-x-generic -
Finally, update grub after removing all old kernels :
sudo update-grub2 -
YOLO command for DEBIAN distros (to remove all of old kernels in 1 line), from AskUbuntu
dpkg --list | grep linux-image | awk '{ print $2 }' | sort -V | sed -n '/'`uname -r`'/q;p' | xargs sudo apt-get -y purgeTHEN, sudo reboot