Re: [HTCondor-users] cgroup setup with centOS7/systemctl?

[Brian Bockelman <bbockelm@xxxxxxxxxxx>]

Hi Thomas,

I think this would now all go into site-local overrides for the HTCondor unit files.

If you find yourself doing anything cgconfig related, you're fighting a 100% losing battle as time goes forward.

Going off memory, I think you can simply set in the condor config:

BASE_CGROUP=/system.slice/condor.service

and you're done -- no other services to run.

If, for example, you want all of HTCondor to have a limit of 16GB of RAM, you would create the following directory (see https://www.freedesktop.org/software/systemd/man/systemd.unit.html):

/etc/systemd/system/condor.service.d

and then create a file /etc/systemd/system/condor.service.d/99_local.conf with the following contents:

[Service]
MemoryLimit=16G

(see https://www.freedesktop.org/software/systemd/man/systemd.resource-control.html).

While this is indeed a new approach to learn, the upside is that this works across the entire range of system services -- and the config file format / rules is shared with huge swaths of the system!

Brian

> On Mar 13, 2017, at 4:51 AM, Thomas Hartmann <thomas.hartmann@xxxxxxx> wrote:
> 
> Hi all,
> 
> with /etc/cgconfig.conf being deprecated under CentOS7/systemctl, I
> wonder if there is already a 'canonical' approach on how to setup/run
> cgroup configs for Condor under systemctl?
> 
> Would be creating an overall unit for condor (or setting resources via
> systemctl set-property for condor.service) the way to go?
> I suppose jobs will be in the condor.service cgroup - would additional
> steps be necessary for setting any job resources (systemd-run?)?
> 
> Cheers and thanks,
>  Thomas
> 
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