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 and...@etc.gen.nz | Catalyst Cloud: | This space intentionally left blank https://catalystcloud.nz |