Re: [DOC] Openstack with RBD DOC update?

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You guys can just respond here and I’ll add your responses to the docs.

Zac

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On Thu, Jan 25, 2024 at 05:52, Ilya Dryomov <[idryomov@xxxxxxxxx](mailto:On Thu, Jan 25, 2024 at 05:52, Ilya Dryomov <<a href=)> wrote:

> On Wed, Jan 24, 2024 at 7:31 PM Eugen Block <eblock@xxxxxx> wrote:
>>
>> We do like the separation of nova pools as well, and we also heavily
>> use ephemeral disks instead of boot-from-volume instances. One of the
>> reasons being that you can't detach a root volume from an instances.
>> It helps in specific maintenance cases, so +1 for keeping it in the
>> docs.
>
> So it seems like instead of dropping mentions of vms pool, we should
> expand "Configuring Nova" section where it says
>
> In order to boot virtual machines directly from Ceph volumes, you
> must configure the ephemeral backend for Nova.
>
> with appropriate steps and /etc/nova/nova.conf snippet. I'm guessing
>
> images_type = rbd
> images_rbd_pool = vms
> images_rbd_ceph_conf = /etc/ceph/ceph.conf
>
> at a minimum?
>
> Zitat or Eugen, do you want to suggest a precise edit based on your
> working configuration for Zac to incorporate or perhaps even open a PR
> directly?
>
> Thanks,
>
> Ilya
>
>>
>> Zitat von Erik McCormick <emccormick@xxxxxxxxxxxxxxx>:
>>
>> > On Wed, Jan 24, 2024 at 10:02 AM Murilo Morais <murilo@xxxxxxxxxxxxxx>
>> > wrote:
>> >
>> >> Good afternoon everybody!
>> >>
>> >> I have a question regarding the documentation... I was reviewing it and
>> >> realized that the "vms" pool is not being used anywhere in the configs.
>> >>
>> >> The first mention of this pool was in commit 2eab1c1 and, in e9b13fa, the
>> >> configuration section of nova.conf was removed, but the pool configuration
>> >> remained there.
>> >>
>> >> Would it be correct to ignore all mentions of this pool (I don't see any
>> >> use for it)? If so, it would be interesting to update the documentation.
>> >>
>> >> https://docs.ceph.com/en/latest/rbd/rbd-openstack/#create-a-pool
>> >
>> >
>> > The use of that "vms" pool is for Nova to directly store "ephemeral" disks
>> > in ceph instead of on local disk. It used to be described in the Ceph doc,
>> > but seems to no longer be there. It's still in the Redhat version [1]
>> > however. Wouldn't it be better to put that back instead of removing the
>> > creation of the vms pool from the docs? Maybe there's a good reason we only
>> > want to boot instances into volumes now, but I'm not aware of it.
>> >
>> > [1] - Section 3.4.3 of
>> > https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/3/html-single/ceph_block_device_to_openstack_guide/index
>> >
>> > -Erik
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>>
>>
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