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@gmail.com> wrote:
On Sun, 3 Apr 2022 at 11:47, Radosław Piliszek <radoslaw.piliszek@gmail.com> wrote:
On Sat, 2 Apr 2022 at 16:00, Laurent Dumont <laurentfdumont@gmail.com>
Hey folks,
Hi Laurent,
I am trying to see if there are any ways to instruct Openstack to
wrote: 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