Re: [HTCondor-users] Error with condor_power

[Valerio Bellizzomi <valerio@xxxxxxxxxx>]

On Thu, 2026-02-26 at 17:05 +0000, Zach McGrew wrote:
> 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.

Yes exact, my central-manager config is as follows:
ABSENT_REQUIREMENTS = True
EXPIRE_INVALIDATED_ADS = True
COLLECTOR_PERSISTENT_AD_LOG = $(SPOOL)/offline.ads
VALID_SPOOL_FILES = $(SPOOL)/offline.ads

Condor_rooster is supposed to call condor_power to wake up a machine,
and in this case the documentation says that the default value is
condor_power -d -i:

https://htcondor.readthedocs.io/en/latest/admin-manual/configuration-macros.html#condor-rooster-configuration-file-macros

ROOSTER_WAKEUP_CMDÂ

    A string representing the command line invoked by condor_rooster
that is to wake up a machine. The command and any arguments should be
enclosed in double quote marks, the same as arguments syntax in an
HTCondor submit description file. The default value is
â$(BIN)/condor_power -d -iâ. The command is expected to read from its
standard input a ClassAd representing the offline machine.


But this configuration does not work for me.



> -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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