Open Stack

On Fri, 2022-06-10 at 14:38 +0000, Paul Harrison wrote:
> 
> > On 2022-06 -10, at 14:13, Paul Harrison <paul.harrison at manchester.ac.uk> wrote:
> > 
> > 
> > 
> > > On 2022-06 -08, at 08:26, Paul Harrison <paul.harrison at manchester.ac.uk <mailto:paul.harrison at manchester.ac.uk>> wrote:
> > > 
> > > 
> > > 
> > > > On 2022-06 -07, at 13:25, Sean Mooney <smooney at redhat.com <mailto:smooney at redhat.com>> wrote:
> > > > 
> > > > no there is noting else you need to configure but this option is not what you think it is.
> > > > the images_type option contols what storage will be used for all non cinder storage.
> > > > i.e. vms that are booted with out usign a boot volume.
> > > > 
> > > > 
> > 
> > > > 
> > > > so your current config will make any non boot from volume nova instance use lvm storage to provision the vm root/swap/epmeral disks
> > > > but will not prevent end users requesting cinder data voluems or boot volumes via the cli/api. if the opt in to cinder stoage that
> > > > is what they will recive but if they use teh default storage provided by the flaovr then it will be local.
> > > 
> > > thanks for the explanation - it is a shame that there is not a more direct way in config to force local storage - looks like https://blueprints.launchpad.net/nova/+spec/use-libvirt-storage-pools <https://blueprints.launchpad.net/nova/+spec/use-libvirt-storage-pools> has never got enough votes for implementation.
> > > 
> > > 
> > 
> > I have discovered the reason why my original setup was not working (it would fail if I tried to force in the GUI, by specifying “no” to "create new volume”) - I think it was failing here
> > 
> > https://opendev.org/openstack/nova/src/commit/d86916360858daa06164ebc0d012b78d19ae6497/nova/virt/libvirt/imagebackend.py#L722 <https://opendev.org/openstack/nova/src/commit/d86916360858daa06164ebc0d012b78d19ae6497/nova/virt/libvirt/imagebackend.py#L722>
> > 
> > as the volume group device does not appear when there are no logical volumes in the group (in Centos 8 stream at least). So I forced the creation of that device by adding a dummy logical volume.
> > 
> > Anyway, the situation is now that I can create instances that will use compute node local LVM storage, if I start them from the GUI, but not from the command line.
> > 
> > I had a look at what the GUI sends to the /api/nova/servers/ endpoint
> > 
> > {"availability_zone":"nova","config_drive":false,"user_data":"","disk_config":"AUTO","instance_count":1,"name":"fromgui","scheduler_hints":{},"security_groups":["48648c10-ce91-4916-9347-d88fbdba9ce6"],"create_volume_default":true,"hide_create_volume":false,"source_id":"b2a3ca46-8b0b-4748-863f-6f3e11301872","flavor_id":"da28d141-3d05-4f0f-a188-229352ccf0a3","nics":[{"net-id":"5e7a171a-ceda-4051-abe6-0496e2e8e154","v4-fixed-ip":""}],"key_name":"cloud”}
> > 
> > However, I have not been able to find the set of command line switches for "openstack server create" that achieve the same effect - if someone knows, I would be grateful.
> > 
> > Thanks,
> > 	Paul.
> > 
> > p.s. I was not really able to match up what the GUI sends with the API spec either. https://docs.openstack.org/api-ref/compute/?expanded=create-server-detail#create-server <https://docs.openstack.org/api-ref/compute/?expanded=create-server-detail#create-server>
> > 
> > 
> 
> Have just realised, taking the hint from the GUI - if I do not try to force anything disk/volume related on the CLI, it does what I want!

yep the default behavior is what you were after.
unfortunetly horizons default is differnt form nova.
im not sure if you can tweak that in the horizon config so the gui also default to local sotrage but for cli users if they dont do anything
fancy they will use the local lvm storage not cinder.
>