Re: [HTCondor-users] mount points in docker universe

[Todd Tannenbaum <tannenba@xxxxxxxxxxx>]

On 2/25/2016 8:59 AM, Matthias Schnepf wrote:
> Hello,
>
> I want to mount some directories in my docker container (running as
> Docker universe). It works fine when the path on the host and inside the
> container are the same.
>
> Is there a method to change the mount point inside the container?
> e.g.:on host: /mnt/storage/ inside docker: /storage/
>
> Thanks
>
> Matthias

Hi Matthias,

Yes, if I recall correctly HTCondor can change the mount point inside 
the container.

To implement your example above (e.g.:on host: /mnt/storage/ inside 
docker: /storage/), I think you could append something like the 
following in condor_config.local :

DOCKER_VOLUMES = $(DOCKER_VOLUMES) STORAGE
DOCKER_MOUNT_VOLUMES = $(DOCKER_MOUNT_VOLUMES) STORAGE
DOCKER_VOLUME_DIR_STORAGE = /mnt/storage:/storage

Warning: the above config is off the top of my head, I didn't personally 
test it....

The key is the ability to use a colon in DOCKER_VOLUME_DIR_xxxx knob to 
specify both host and container mount points.
See details from the development ticket for this feature at:
  https://htcondor-wiki.cs.wisc.edu/index.cgi/tktview?tn=5308

It looks to me like the HTCondor Manual documentation on this feature is 
not yet 100% complete; for instance I didn't see it mention the ability 
to have different host and container mount points.  We will make a 
documentation ticket to correct this for future releases of the HTCondor 
Manual.

Hope the above helps.

Todd


--
Todd Tannenbaum <tannenba@xxxxxxxxxxx> University of Wisconsin-Madison
Center for High Throughput Computing   Department of Computer Sciences
HTCondor Technical Lead                1210 W. Dayton St. Rm #4257