Jul 072016
 

A simple cron job removing old kernels.

You may find yourself in situation where linux kernels accumulated under/boot are starting to fill up disk space. Especially painful on the systems with small /boot partition. No automated solution out of the box on Debian/Ubuntu. Here is a workaround, removing all but two newest kernels:

crontab -l

10 23 * * 1 /root/bin/kernel-cleanup.sh

 

vim /root/bin/kernel-cleanup.sh

#!/bin/bash
echo "---------- Starting autoremove, we get rid of the old kernels eating /boot space"|logger
OLD=$(ls -tr /boot/vmlinuz-* | head -n -2 | cut -d- -f2- | awk '{print "linux-image-" $0}')
if [ -n "$OLD" ]; then
 apt-get -qy remove --purge $OLD
fi

 

Bonus hint – same thing for Centos machines

# we need yum-utils
yum install yum-utils

# add cronjob
crontab -e
0 2 * * Sat root /usr/bin/package-cleanup -y --oldkernels --count=2 |logger