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Re: [Condor-users] How To TroubleShoot Flocking

By the way: the reference to "condor_exec.exe" is expected. This is the name Condor runs the user's executable as (i.e. argv[0]). Failure to execute the job is most often the result of files not being accessible from the execute node. I assume this is a vanilla universe job. What file-transfer settings are you using?


Kewley, J (John) wrote:

[don't treat below as gospel - I haven't flocked in a while so some things may have
changed or I may have mis-spelled things]
There a few subtle things that can stop flocking working:
* set FLOCK_TO and FLOCK_FROM at both ends for a 2 way flock
* HOSTALLOW values may need to be changed to include these other machines
* If you have security enabled - then this might need to be made more flexible
to include other authentication mechanisms
* Machines in other pool may be of a different ARCH or OpSys
* Your jobs may be setup to use a shared filestore (NFS for instance) which
isn't available from the other pool.
You can use
condor_config_val -pool NODE_NAME -name NODE_NAME val
where val is one of
hostallow_write, hostallow_read, flock_to, flock_from
to see what values are set for the different machines
But the more usual culprits are firewalls.
Are there any firewalls between the pools? (or is one pool behind a NAT)
Remember that for jobs to flock, every submit node needs to be able to talk to every execute node and vice versa over the fixed ports and upper port range, all over both tcp and udp.
If that is not the case, you'll have to relax the firewalls or use GCB.
See also
for more info on firewalls in a Condor Pool

    -----Original Message-----
    *From:* condor-users-bounces@xxxxxxxxxxx
    [mailto:condor-users-bounces@xxxxxxxxxxx]*On Behalf Of *John Alberts
    *Sent:* Wednesday, July 05, 2006 8:41 PM
    *To:* Condor-Users Mail List
    *Subject:* [Condor-users] How To TroubleShoot Flocking

    Hi. I am trying to setup flocking between 2 condor pools. 1 pool I
    have complete control/access to, the other pool I can log in using
    ssh and submit jobs. The administrator of the other pool is
    currently on vacation and said he has configured flocking to/from
    our pool. I’m trying to test it, and it seems like flocking isn’t

    I was wondering how I can troubleshoot flocking to see what the
    culprit is. I already tried to submit a job whose requirements can
    only be fulfilled on the other pool. Condor_status –analyze
    <jobid> shows that all machines can’t meet the requirements. I
    have also run condor_status –pool <otherpoolname> and it properly
    displays all available machines on the other pool. I’m not sure
    what to check next.

    Note: There is a firewall between the pools and our network admin
    has already configured the firewall to allow traffic between pools.

    Thanks for any help.

    John Alberts
    Technical Assistant for EMS
    alberts@xxxxxxxxxxxxxxxxxx <mailto:alberts@xxxxxxxxxxxxxxxxxx>
    CLO 332


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