Re: [HTCondor-users] Error with condor_power

[Valerio Bellizzomi <valerio@xxxxxxxxxx>]

On Thu, 2026-02-26 at 19:25 +0100, Valerio Bellizzomi wrote:
> 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.
> 

Follow-up:

The following command wakes up the ep:

condor_power -d -s 255.255.255.255 -m b8:af:6f:84:5c:67
03/04/26 19:53:14 Can't find Name in classad for startd 
03/04/26 19:53:14 Can't find CondorVersion in classad for startd 
03/04/26 19:53:14 Can't find CondorPlatform in classad for startd 
03/04/26 19:53:14 Can't find Machine in classad for startd 
Packet sent.

the ep boots and the job that was waiting in idle state now is in
running state.
however I don't know how to automate this since rooster doesn't seem to
invoke condor_power at intervals of 300 sec like it is specified in my
configuration.

Looking at the condor_power code, "error in class ad" is actually
E_CLASSAD = -9, while the errno = -1 indicates something else.


> 
> > -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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