[one-users] need advice about a use-case

[Jaime Melis]

Hello,

Short answer: can't be achieved currently, but it's an interesting use case
and we will include it in OpenNebula 3.8 [1].

Long answer:
What you need is a DISK which will not be cloned (CLONE = NO),  will not be
saved (SAVE = NO) and that it's marked as readonly (READONLY = YES).
Currently there are some inconsistencies regarding these attributes: they
are overridden by the image persistency (CLONE and SAVE) and type
(READONLY). This renders these attributes useless in this scenario.

We need to modify the core in order to make it work, and we will release it
with OpenNebula 3.8. Once it's working you will be able to:
1) Register the base OS image
2) Create a new template per VM where:
-- the base OS disk is set as DISK = [ IMAGE_ID = <ID>, SAVE = NO, CLONE =
NO, READONLY = YES ]
-- each one has its own CONTEXT
3) Once the VM boots it performs the aufs setup.

[1] http://dev.opennebula.org/issues/1449

Cheers,
Jaime

On Fri, Aug 31, 2012 at 8:35 PM, christopher barry <cbarry at rjmetrics.com>wrote:

> Greetings Nebulars
>
> I'm re-posting this, as it didn't get an answer last time. I could use
> some advise/guidance.
>
> Here is the scenario I'm trying to create:
>
> * I have a base OS image as a logical volume in an array.
>
> * I want all guests to boot this same image read-only - no copies.
>
> * the initramfs in the base image will mount the context iso to
> determine it's own unique data/config disk - also a logical volume.
>
> * this data/config volume is unioned with aufs read/write over the
> readonly base image in the initramfs, so that they together form the
> complete 'root' filesystem.
>
> * all disks are served via iSCSI
>
>
> Each data/config disk needs to be persistent, and belong to a unique
> guest, but everyone shares the exact same read-only OS disk.
>
> Can anyone speak to the best method of integrating this scenario with
> ONE? I've tested this outside of ONE, but now I need to make it work in
> ONE. Would I need a separate template for each machine? I've heard
> mention of maybe needing to make the OS disk an ISO image, does anyone
> know why that would be a requirement?
>
>
> Regards,
> -C
>
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>



-- 
Jaime Melis
Project Engineer
OpenNebula - The Open Source Toolkit for Cloud Computing
www.OpenNebula.org | jmelis at opennebula.org
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