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Old 03-17-2010, 07:11 AM   #1
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Registered: May 2006
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Installed/running kernel version


how can I check if the running kernel is the latest installed kernel?

I have ym-updatesd running, and I'd like to get notification when a newer kernel has been installed, so that I can (check whats new) and consider re-booting.

uname -r gives running kernel, but how to dig out the latest installed kernel? yum list kernel and rpm -qa kernel (or ls /boot) have the raw data, but there has to be a more straightforward way than parsing those.

cat /var/log/yum.log | grep kernel | grep -i install | tail -1 | awk ... or something?

Now In need to login every now and then (1-x times per week) and check what I have in /boot. This is a server box running 24/7/365.

Old 03-17-2010, 07:22 AM   #2
Registered: Jul 2007
Location: Scunthorpe, UK
Distribution: Ubuntu 8.10; Gentoo; Debian Lenny
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You could check the directory where the kernels are kept, usually in /boot/, and that is probably your best option. You could also keep up to date with kernel release cycles so you know when to expect a new one, you could see whether new entries to your bootloader have been added, of course, that could be a nice misuse and hack, but it'd work.
Old 03-18-2010, 02:58 AM   #3
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Registered: May 2006
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would something like this detect if I'm running the latest kernel? This is just a test skeleton, if this seems to work the idea is to put the real action where it now says REBOOT.

Id like to avoid listing /boot contents and "guessing" (with my shell script skills...) what is the latest kernel. Also, parsing /boot/grub/menu.lst does not seem to be that easy (to me), if the goal is to have realiable AND simple check.

This is Fedora 12 (64-bit), so it's rpm/yum based.


Update: looks like kernel is kernel-PAE on 32-bit Fedora, so the scipt below works only in 64-bit.


kernel_rpm=`rpm -q --last kernel | head -1 | awk '{print $1}' | awk -F kernel- '{print $2}'`
kernel_yum=`cat /var/log/yum.log | grep kernel | grep -i install | tail -1 | awk '{print $NF}'`

kernel_run=`uname -r | awk -F .$(uname -p) '{print $1}'`

# echo [$kernel_rpm]
# echo [$kernel_yum]
# echo [$kernel_run]

if [ "$kernel_yum" == "$kernel_rpm" ] ; then
        echo OK, yum and rpm report the same kernel
        echo ERROR, yum and rpm DID NOT report the same kernel

if [ "$kernel_run" == "$kernel_rpm" ] ; then
        echo OK, running the latest installed kernel
        echo REBOOT, NOT running the latest installed kernel


Last edited by Paavo; 03-20-2010 at 03:37 AM.


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