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From: Wido den Hollander <wido@widodh.nl>
To: "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: cephx execute permissions for RBD operations
Date: Wed, 30 Jan 2013 17:21:01 +0100	[thread overview]
Message-ID: <5109486D.7040505@widodh.nl> (raw)

Hi,

Yesterday I ran into a weird situation where my libvirt RBD pool
just wouldn't work.

Turned out the credentials I was using only had rw permissions for OSDs 
instead of rwx or *.

This caused rbd_open to fail, looking at librbd itself I understand why 
execute permissions are required to do so (locks, watches).

What is however the best way to detect if you don't have the required 
permissions?

This piece of code: 
http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_rbd.c;h=8a0e517502c482f23f01bc63e95f1dc210d711cd;hb=master#l215

I simply check if the open fails, but just "failed to open the RBD 
image" wasn't really that clear.

I'd like to give a more useful error instead of that, but what error 
codes can I expect?

Wido


             reply	other threads:[~2013-01-30 16:21 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-01-30 16:21 Wido den Hollander [this message]
2013-01-30 21:20 ` cephx execute permissions for RBD operations Josh Durgin

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