Open Stack

If you are using Ceph as a Cinder backend, you would likely want to run cinder-volume on your controller node(s).   You could run it anywhere I suppose, including on the Ceph nodes themselves, but I’d recommend having it on the controllers.  Wherever you run it, you’d need a properly configured ceph.conf, and if you are using cephx authentication, you’d need the keyring files.  Your compute nodes would need that conf and keys also.

You can also run Ceph for nova ephemeral disks without Cinder at all.  You’d do that in nova.conf.

We use both at Overstock.  Ceph for nova ephemeral for general use, and also Ceph as one option in a multi-backend Cinder configuration.  We also use it for a Glance store, which is a fantastic option because it makes disk provisioning for Nova instant, since you’re essentially snapshotting and image RBD into an RBD for Nova/Cinder.

Mike Smith
Lead Cloud Systems Architect
Overstock.com<http://Overstock.com>



On Mar 7, 2016, at 10:04 PM, Martin Wilderoth <martin.wilderoth at linserv.se<mailto:martin.wilderoth at linserv.se>> wrote:


Hello

Where should I run cinder-volume when i user ceph
on the controller ?
on the ceph mon or mds ?
or ?

Maybe it dosn't matter ?

Thanks in advance

Regards Martin
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