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I’m not sure you actually need full cinder support, see “Boot Without Cinder” in https://docs.openstack.org/ironic/latest/admin/boot-from-volume.html

(Never tried it though ….)
Tim

From: Jason Anderson <jasonanderson at uchicago.edu>
Date: Wednesday, 8 May 2019 at 18:17
To: "openstack-discuss at lists.openstack.org" <openstack-discuss at lists.openstack.org>, "jsbryant at electronicjungle.net" <jsbryant at electronicjungle.net>
Subject: Re: topic: ironic boot from cinder volume(the cinder volume backend is ceph storage)

Tim, Jay --

I looked in to this recently as it was a use-case some of our HPC users wanted support for. I noticed that Ceph has the iSCSI gateway, but my impression was that this wouldn't work without adding some sort of new driver in Cinder. Is that not true? I thought that Cinder only Ceph via RBD. I'd be happy to be proven wrong on this.

Cheers,
/Jason
________________________________
From: Jay Bryant <jungleboyj at gmail.com>
Sent: Wednesday, May 8, 2019 11:04
To: openstack-discuss at lists.openstack.org
Subject: Re: topic: ironic boot from cinder volume(the cinder volume backend is ceph storage)

Tim,

Good thought.  That would be an interim solution until we are able to
get the process automated.

Jay

On 5/8/2019 10:55 AM, Tim Bell wrote:
> Just brainstorming....
>
> Would it be possible to set up a couple of VMs as iscsi LIO gateways by hand while this feature is being developed and using that end point to boot an Ironic node? You may also be on a late enough version of Ceph to do it using http://docs.ceph.com/docs/mimic/rbd/iscsi-overview/.
>
> Not self-service but could work for a few cases..
>
> Tim
>
> -----Original Message-----
> From: Jay Bryant <jungleboyj at gmail.com>
> Reply-To: "jsbryant at electronicjungle.net" <jsbryant at electronicjungle.net>
> Date: Wednesday, 8 May 2019 at 17:46
> To: "openstack-discuss at lists.openstack.org" <openstack-discuss at lists.openstack.org>
> Subject: Re: topic: ironic boot from cinder volume(the cinder volume backend is ceph storage)
>
>      This is going to require being able to export Ceph volumes via iSCSI.
>      The Ironic team communicated the importance of this feature to the
>      Cinder team a few months ago.
>
>      We are working on getting this support in place soon but it probably
>      will not be until the U release.
>
>      Thanks!
>
>      Jay
>
>
>      On 5/8/2019 6:48 AM, 陈杰 wrote:
>      > Nowdays , the opestack rocky release ironic , is support ironic boot
>      > from cinder volume(the cinder volume backend is ceph storage)? My goal
>      > is to achieve this.
>      > Who can tell me about this principle?
>      > looking forward to a reply
>      > thank you all.
>
>
>
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