Re: [HTCondor-users] Error with condor_power

[Zach McGrew <mcgrewz@xxxxxxx>]

The `-i` tells condor_power to read a classad from stdin and not a file. Removing the `-i` lets you specify a file to read from instead. It's a neat trick where you can build your own tiny classad to wake up a machine similar to what condor_rooster does. You can use something like this to wakeup machines on demand:

printf "MyAddress = \"<${the_ip}:9618>\"\nHardwareAddress = \"${hwaddr}\"\nSubnetMask = \"${subnet}\"\n" | condor_power -i

Presumably your offline.ads is set by "COLLECTOR_PERSISTENT_AD_LOG" in which case it's not a classad, but a little database like file that describes the slots that the collector was aware of but stopped talking to it for some reason or another. These should be visible with "condor_status -offline" or "condor_status -absent" depending on how they got entered. The file itself is used to restore those slots into memory when the collector restarts (i.e. restarting the collector means you no longer forget about the EPs that are powered off). You're not meant to pass this file as is to condor_power.

-Zach

________________________________________
From: HTCondor-users <htcondor-users-bounces@xxxxxxxxxxx> on behalf of Valerio Bellizzomi <valerio@xxxxxxxxxx>
Sent: Thursday, February 26, 2026 6:01 AM
To: htcondor-users@xxxxxxxxxxx
Subject: Re: [HTCondor-users] Error with condor_power

On Thu, 2026-02-26 at 13:20 +0000, Pelletier, Michael V  via HTCondor-
users wrote:
>
>
>
> Double-check the offline.ads file for that â107 1â string â looks like itâs just carping about a syntax error.
>
> Michael V Pelletier
> Principal Technologist
>
> C: +1 339.293.9149
> michael.v.pelletier@xxxxxxx

Thank you, the file is generated automatically by the collector I
think, and I have attempted to edit the file removing the initial
numbers, but still the same error.


>
>
>
> From: HTCondor-users <htcondor-users-bounces@xxxxxxxxxxx>On Behalf Of Valerio Bellizzomi
> Sent: Thursday, February 26, 2026 6:19 AM
> To: HTCondor-Users List <htcondor-users@xxxxxxxxxxx>
> Subject: [HTCondor-users] Error with condor_power
>
>
>
> Hello, has anyone had the same error? # condor_power -d -i /var/spool/condor/offline.âads 02/26/26 12:â16:â41 failed to create classad; bad expr = '107 1 CreationTimestamp 1772031128' condor_power: error in class-ad (errno = -1). _______________________________________________
>
> Hello,
> has anyone had the same error?
>
> # condor_power -d -i /var/spool/condor/offline.ads
> 02/26/26 12:16:41 failed to create classad; bad expr = '107 1
> CreationTimestamp 1772031128'
> condor_power: error in class-ad (errno = -1).
>
>
>
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