Qemu fails to open RBD image when auth_supported is not set to 'none'

[Wido den Hollander <wido@widodh.nl>]

Hi,

I just tried to start a VM with libvirt with the following disk:

<disk type='network' device='disk'>
   <driver name='qemu' type='raw' cache='none'/>
   <source protocol='rbd' name='rbd/8489c04f-aab8-4796-a22a-ebaa7be247a7'>
     <host name='31.25.XX.XX' port='6789'/>
   </source>
   <target dev='vda' bus='virtio'/>
</disk>

That fails with: "Operation not supported"

I tried qemu-img:

qemu-img info 
rbd:rbd/8489c04f-aab8-4796-a22a-ebaa7be247a7:mon_host=31.25.XX.XX\\:6789

Same result.

I then tried:

qemu-img info 
rbd:rbd/8489c04f-aab8-4796-a22a-ebaa7be247a7:mon_host=31.25.XX.XX\\:6789:auth_supported=none

And that worked :)

This host does not have a local ceph.conf, all the parameters have to 
come from the command line.

I know that recently auth_supported defaults to "cephx", but that now 
break the libvirt integration since it doesn't set auth_supported to 
explicitly none when no auth section is present.

Should this be something that gets fixed in librados or in libvirt?

If it's libvirt, I'll write a patch for it :)

Wido