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Re: [Qemu-devel] [PATCH RFC v3 for-2.9 09/11] rbd: Revert -blockdev para
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] [PATCH RFC v3 for-2.9 09/11] rbd: Revert -blockdev parameter password-secret |
Date: |
Tue, 11 Apr 2017 15:11:41 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) |
"Daniel P. Berrange" <address@hidden> writes:
> On Mon, Mar 27, 2017 at 03:26:33PM +0200, Markus Armbruster wrote:
>> This reverts a part of commit 8a47e8e. We're having second thoughts
>> on the QAPI schema (and thus the external interface), and haven't
>> reached consensus, yet. Issues include:
>>
>> * BlockdevOptionsRbd member @password-secret isn't actually a
>> password, it's a key generated by Ceph.
>>
>> * We're not sure where member @password-secret belongs (see the
>> previous commit).
>>
>> * How @password-secret interacts with settings from a configuration
>> file specified with @conf is undocumented. I suspect it's untested,
>> too.
>>
>> Let's avoid painting ourselves into a corner now, and revert the
>> feature for 2.9.
>>
>> Note that users can still configure an authentication key with a
>> configuration file. They probably do that anyway if they use Ceph
>> outside QEMU as well.
>
> NB, this makes blockdev-add largely useless for RBD from libvirt's POV,
> since we rely on the password-secret facility working to support apps
> like openstack which won't configure the global config file for RBD.
Libvirt could still supply a *local* configuration file.
> Not a regression though, since blockdev-add is new - just means we won't
> be able to use the new feature yet :-(
Unfortunate if true, but QMP interfaces need to be stable, and this one
clearly needs more thought.