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Got it!

By quota, do you mean reserved_host_disk_mb in nova.conf? I could make the
/var/lib/nova/instances RO but I am not sure how that would impact config
drive that are created locally (since I dont have ceph)

Just to be clear on the behavior, this means that boot-from-image requests
would fail?

Looking at nova.conf, I can disable the number of local-disks supported,
but this doesn't act as a behavior change when the requests are made.

I assume, from what I now know, that there is no mechanism to
default/transform a request to BFV.

# A negative number means unlimited. Setting max_local_block_devices#
to 0 means that any request that attempts to create a local disk# will
fail. This option is meant to limit the number of local discs# (so
root local disc that is the result of --image being used, and# any
other ephemeral and swap disks). 0 does not mean that images# will be
automatically converted to volumes and boot instances from# volumes -
it just means that all requests that attempt to create a# local disk
will fail.## Possible values:## * 0: Creating a local disk is not
allowed.# * Negative number: Allows unlimited number of local discs.#
* Positive number: Allows only these many number of local discs.#
                  (Default value is 3).#  (integer
value)#max_local_block_devices = 3


On Sun, Apr 3, 2022 at 5:54 AM Radosław Piliszek <
radoslaw.piliszek at gmail.com> wrote:

> On Sun, 3 Apr 2022 at 11:47, Radosław Piliszek
> <radoslaw.piliszek at gmail.com> wrote:
> >
> > On Sat, 2 Apr 2022 at 16:00, Laurent Dumont <laurentfdumont at gmail.com>
> wrote:
> > >
> > > Hey folks,
> >
> > Hi Laurent,
> >
> > > I am trying to see if there are any ways to instruct Openstack to
> prevent the usage of local storage/ephemeral disks.
> > >
> > > There are cases where :
> > >
> > > I don't want the added complexity of Ceph.
> > > I don't want the added hassle of using local volumes/nfs/shared
> storage on the computes directly.
> > >
> > > In an ideal world, creating a VM would mean that you always have a
> boot-from-volume with the volume being in your chosen backend.
> > >
> > > I've seen this spec :
> https://blueprints.launchpad.net/nova/+spec/flavor-root-disk-none
> > >
> > > But it doesn't seem to have survived the Ocata cycle.
> > >
> > > Any thoughts?
> >
> > You can set the root and ephemeral disk sizes to 0 which means the
> > flavor is not usable without a volume.
>
> Sorry, I somehow forgot to write the actual workaround.
> There should be this sentence in here:
> And then, make the nova's local disk store readonly / with a small quota.
>
> > This way you are forced to use Cinder and what it offers.
> >
> > -yoctozepto
>
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