Re: Publishing raw generic{,cloud} images without tar, and without compression, plus versionning of point releases
Hi Bastian,
I was writing a long reply to this, but I've decided not to bother,
because it boils down to this:
Can you please accept that there are a number, possibly a large, number
of clouds out there which can not, and will not, consume qcow2 images
natively.
We, and I expect all, are not going to change our deployments because
you disagree with our operational decisions and feel like nit-picking
about the upstream documentation.
Kind regards,
Andrew
On Sat, 2020-06-06 at 15:13 +0200, Bastian Blank wrote:
> On Sat, Jun 06, 2020 at 11:16:42PM +1200, Andrew Ruthven wrote:
> > Those are examples, and it notes that the formats available are
> > configurable and none of them are specified as "must be available".
> > The
> > CLI docs also have a similar note.
> > "Disk and container formats are configurable on a per-deployment
> > basis."
>
> Both say "configurable", this makes the setting a policy decision.
>
> What I seek is the documentation of the technical problems. And, if
> Glance can't handle qcow2 with rbd, why such broken cases are not
> outright rejected, without the admin setting some magic options.
>
> > Please don't make assumptions. How can you know that the system
> > you're
> > dealing with can make conversions?
>
> At least Cinder converts images all the time, and sometimes does not
> even know what it actually got, which leads to things like
> CVE-2015-1851.
>
> > How do you get that reading? When you read in context within the
> > email
> > it reads as "we disable qcow2 because our backend only supports
> > raw"
> > because that's what I said elsewhere in the email.
>
> Because of the "we", which I read as the admins of the instance. And
> "backend", which I don't talk to directly, but only to the Glance
> API.
> And the, at least to my searches, missing big and fat warning: don't
> do
> that, ever!
>
> The only thing I can find comes from the Ceph documentation:
> > Important
> > Using QCOW2 for hosting a virtual machine disk is NOT recommended.
> > If
> > you want to boot virtual machines in Ceph (ephemeral backend or
> > boot
> > from volume), please use the raw image format within Glance.
>
> Regards,
> Bastian
>
--
Andrew Ruthven, Wellington, New Zealand
andrew@etc.gen.nz |
Catalyst Cloud: | This space intentionally left blank
https://catalystcloud.nz |
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