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Franck, If the cache works fine , I think glance image format could be
qcow2. The volume is created in raw format but
the download phase is executed only the fisrt time you create a volume from
a new image.
With this setup I can create 20-30 instance in a shot and it takes few
minutes to complete.
I always use general purpose small images and colplete the instance
configuration (package installation and so on) with heat or ansible.
Ignazio


Il giorno mar 23 nov 2021 alle ore 08:57 Franck VEDEL <
franck.vedel at univ-grenoble-alpes.fr> ha scritto:

> Ignazio, Radoslaw,
>
> thanks to you, I made some modifications and my environment seems to work
> better (the images are placed on the iiscsi bay on which the volumes are
> stored).
> I installed the cache for glance. It works, well I think it does.
>
> My question is: between the different formats (qcow2, raw or other), which
> is the most efficient if
> - we create a volume then an instance from the volume
> - we create an instance from the image
> - we create an instance without volume
> - we create a snapshot then an instance from the snapshot
>
> Franck
>
>
>
>
> Le 19 nov. 2021 à 14:50, Ignazio Cassano <ignaziocassano at gmail.com> a
> écrit :
>
> Franck, this help you a lot.
> Thanks Radoslaw
> Ignazio
>
> Il giorno ven 19 nov 2021 alle ore 12:03 Radosław Piliszek <
> radoslaw.piliszek at gmail.com> ha scritto:
>
>> If one sets glance_file_datadir_volume to non-default, then glance-api
>> gets deployed on all hosts.
>>
>> -yoctozepto
>>
>> On Fri, 19 Nov 2021 at 10:51, Ignazio Cassano <ignaziocassano at gmail.com>
>> wrote:
>> >
>> > Hello Franck, glance is not deployed on all nodes at default.
>> > I got the same problem
>> > In my case I have 3 controllers.
>> > I created an nfs share on a storage server where to store images.
>> > Before deploying glance, I create /var/lib/glance/images on the 3
>> controllers and I mount the nfs share.
>> > This is my fstab on the 3 controllers:
>> >
>> > 10.102.189.182:/netappopenstacktst2_glance /var/lib/glance nfs
>> rw,user=glance,soft,intr,noatime,nodiratime
>> >
>> > In my globals.yml I have:
>> > glance_file_datadir_volume: "/var/lib/glance"
>> > glance_backend_file: "yes"
>> >
>> > This means images are on /var/lib/glance and since it is a nfs share
>> all my 3 controlles can share images.
>> > Then you must deploy.
>> > To be sure the glance container is started on all controllers, since I
>> have 3 controllers, I deployed 3 times changing the order in the inventory.
>> > First time:
>> > [control]
>> > A
>> > B
>> > C
>> >
>> > Second time:
>> > [control]
>> > B
>> > C
>> > A
>> >
>> > Third time:
>> > [control]
>> > C
>> > B
>> > A
>> >
>> > Or you can deploy glance 3 times using -t glance and -l <controllername>
>> >
>> > As far as the instance  stopped, I got I bug with a version of kolla.
>> > https://bugs.launchpad.net/kolla-ansible/+bug/1941706
>> > Now is corrected and with kolla 12.2.0 it works.
>> > Ignazio
>> >
>> >
>> > Il giorno mer 17 nov 2021 alle ore 23:17 Franck VEDEL <
>> franck.vedel at univ-grenoble-alpes.fr> ha scritto:
>>
>
>
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