script to reboot server after kernel install

gartie · 01-12-2016, 05:25 PM

Hello,

I have a script that I need to run that will reboot a server after a kernel rpm has been installed. the problem is, is that there are several kernels on the server, and I need it to recognize the latest one and then reboot.

Code:

#!/bin/bash

MAX_Time=$(bc <<< '10*60')
RPMage=$(($(date +%s) - $(rpm -qa --queryformat "%{installtime}\n" kernel|head -1)))

if [[ ${RPMage} -lt ${MAX_Time} ]]; then
     echo "Rebooting server since package was installed within last 10 Minutes"
     /sbin/shutdown -r +2 &
#else
    echo "NOT Rebooting server since package was installed over 10 Minutes ago"
fi

grail · 01-13-2016, 11:26 AM

Firstly, bc is not required as bash can perform integer arithmetic easily.

As to your question, the script tells a slightly different story, as far as I can tell??

Your script appears to be testing how long ago an install was performed, but your question seems related to which version is to be installed?

Would you please clarify which question we are trying to answer?

thesnow · 01-13-2016, 11:31 AM

Instead of "head -1 " you could use "sort|tail -1" to give the largest (latest) installtime.

You could also consider just checking whether installtime > last boot time (e.g., using btime from /proc/stat). Then you could run your script every 10 minutes from cron.

Habitual · 01-13-2016, 11:42 AM

Server + new kernel + automatic anything = epic fail.

Just my opinion.

gartie · 01-13-2016, 12:51 PM

Hi,

I am installing an rpm, and I need to check if it has been installed within the last 10 minutes. If so, then I would like to reboot the server. I have used this with other RPM names, the difference has been that there was only one version of the rpm. Now I have 2 or 3 on the system, and I am not sure how to get that info.

thanks,

Habitual · 01-13-2016, 01:18 PM

Quote:

Originally Posted by gartie

Hi,

I am installing an rpm, and I need to check if it has been installed within the last 10 minutes. If so, then I would like to reboot the server. I have used this with other RPM names, the difference has been that there was only one version of the rpm. Now I have 2 or 3 on the system, and I am not sure how to get that info.

thanks,

What I don't get is if you know you're installing a kernel rpm that will need reboot,
why not install it and reboot in one command?

Code:

rpm -[UI]vh /path/or/what/ever.rpm && reboot

rpm package manager surely logs, does it not?

What's the deal with "10 minutes"???

gartie · 01-13-2016, 01:23 PM

the script was originally written for a glibc package that was updated for a redhat security alert. the 10 minutes was to give the package time to install.

John VV · 01-13-2016, 03:52 PM

and why the rpm command ?
for a rhel use yum or for suse use zypper

gartie · 01-13-2016, 03:59 PM

the install and script are actually run thru a product called HPSA.
the product will install the rpm automatically, and the script will be part of the install policy.
in this way I can push it to a large number of servers with one click. automation...

bigearsbilly · 01-14-2016, 01:38 AM

don't forget you will need a script to clean up the mess you've made with the first one.