Re: QEMU maps RBD but can't read them

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On Tue, Jun 12, 2018 at 4:53 AM, Wladimir Mutel <mwg@xxxxxxxxx> wrote:
> Jason Dillaman wrote:
>
>>>          One more question, how should I set profile 'rbd-read-only'
>>> properly
>>> ? I tried to set is for 'client.iso' on both 'iso' and 'jerasure21'
>>> pools,
>>> and this did not work. Set profile on both pools to 'rbd', it worked. But
>>> I
>>> don't want my iso imaged to be accidentally modified by virtual guests.
>>> Can
>>> this be solved with Ceph auth, or in some other way ? (in fact, I look
>>> for
>>> Ceph equivalent of 'chattr +i')
>
>
>> QEMU doesn't currently handle the case for opening RBD images in
>> read-only mode, so if you attempt to use 'profile rbd-read-only', I
>> suspect attempting to open the image will fail. You could perhaps take
>> a middle ground and just apply 'profile rbd-read-only pool=jerasure21'
>> to protect the contents of the image.
>
>
>         For QEMU I found that profile 'rbd-read-only' currently does not
> work. So, I use 'profile rbd' for both replicated and erasure pools, and
> hope that 'readonly' configuration in QEMU disk would help.
>         In my past experience I found that running 'kvm ... -cdrom
> something.iso' sometimes would modify that .iso-file, so I had to set
> immutable attribute on the FS level.

I opened a tracker ticket [1] to submit a patch to QEMU to support
read-only images in the RBD block driver.

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[1] http://tracker.ceph.com/issues/24506

-- 
Jason
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