Re: [HTCondor-users] delaying job starts on execute node boot up

[Greg Thain <gthain@xxxxxxxxxxx>]

On 11/5/25 07:57, Andrew Pickford wrote:
> Hi All,
>
> I'd like some advise on the best way to automatically stop an execute 
> node from running jobs for say 5 minutes after the machine has booted up. 


HTCondor doesn't advertise the system boot time by default. However, 
with STARTD_CRON, it is straightforward to add the system boot time to 
the slot ad. If you are on linux, the startd cron script can grep the 
btime out of /proc/stat, and advertise that. A script that looks 
something like this:

#!/bin/sh

awk '/^btime/ { print "BootTime =", $2} END {print "- update:true"}' < 
/proc/stat


will generate the proper classad snippet, and setting up the startd cron 
in the startd config would look like this:

STARTD_CRON_JOBLIST = BOOTTIME $(STARTD_CRON_JOBLIST)
STARTD_CRON_BOOTTIME_MODE = OneShot
STARTD_CRON_BOOTTIME_EXECUTABLE = /tmp/boot.sh


After that, you can use "BootTime" in your start expression. Season to 
taste.


-greg