Hi all,

We're trying to mount an rbd image inside of a linux container that has been 
created with docker (https://www.docker.io/). We seem to have access to the rbd 
kernel module from inside the container:

# lsmod | grep ceph
libceph               218854  1 rbd
libcrc32c              12603  3 xfs,libceph,dm_persistent_data

And we can query the pool for available rbds and create rbds from inside the 
container:

# rbd -p dockers --id dockers --keyring /etc/ceph/ceph.client.dockers.keyring 
create lxctest --size 51200
# rbd -p dockers --id dockers --keyring /etc/ceph/ceph.client.dockers.keyring ls
lxctest

But for some reason, we can't seem to map the device to the container:

# rbd -p dockers --id dockers --keyring /etc/ceph/ceph.client.dockers.keyring 
map lxctest
rbd: add failed: (22) Invalid argument

I don't see anything particularly interesting in dmesg or messages on either 
the container or the host box. Any ideas on how to troubleshoot this?

Thanks!

--
Kevin Weiler
IT

IMC Financial Markets | 233 S. Wacker Drive, Suite 4300 | Chicago, IL 60606 | 
http://imc-chicago.com/
Phone: +1 312-204-7439 | Fax: +1 312-244-3301 | E-Mail: 
[email protected]<mailto:[email protected]>

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