[ovirt-users] Re: Direct Linux kernel/initrd boot

[Konstantin Shalygin]

Hi,

> On 27 Jul 2021, at 21:24, Chris Adams  wrote:
> 
> From a pure user perspective (never looked at the oVirt code for this)...
> 
> Right now, it looks like the way to reference the ISO domain is
> iso://.  Nothing specifies the domain name (I guess there can
> be only one ISO domain).
> 
> Maybe an alternative (to get it out being of strictly tied to the one
> and only ISO domain) would be something like domain:///,
> so which storage domain could be specified (and then it doesn't matter
> if it's an ISO domain or regular storage domain).
> 
> Anyway, for my short term, it looks like I just need to build ISOs on
> the fly and upload them to the regular storage domain (since I don't
> have an ISO domain).

I think you can use httpisoboot vdsm hook [1] for this


[1] https://github.com/oVirt/vdsm/tree/master/vdsm_hooks/httpsisoboot 

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[ovirt-users] Re: Direct Linux kernel/initrd boot

[Chris Adams]

Once upon a time, Yedidyah Bar David  said:
> Adding Michal. Michal - IMO we should make up our minds and provide a
> clear view - either undeprecate the ISO domain - remove deprecation
> notices from everywhere - or provide concrete plans to fill the
> missing gaps.

From a pure user perspective (never looked at the oVirt code for this)...

Right now, it looks like the way to reference the ISO domain is
iso://.  Nothing specifies the domain name (I guess there can
be only one ISO domain).

Maybe an alternative (to get it out being of strictly tied to the one
and only ISO domain) would be something like domain:///,
so which storage domain could be specified (and then it doesn't matter
if it's an ISO domain or regular storage domain).

Anyway, for my short term, it looks like I just need to build ISOs on
the fly and upload them to the regular storage domain (since I don't
have an ISO domain).

-- 
Chris Adams 
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[ovirt-users] Re: Direct Linux kernel/initrd boot

[Nir Soffer]

On Tue, Jul 27, 2021 at 12:10 PM Yedidyah Bar David  wrote:
>
> On Tue, Jul 27, 2021 at 11:56 AM Shani Leviim  wrote:
> >
> > Hi Chris,
> > Indeed, the ISO domains are deprecated, and you can use a data domain for 
> > uploading iso files (as you've mentioned).
> > To do that, you need to use image-io for uploading images
> >
> > Here's image-io documentation: 
> > http://ovirt.github.io/ovirt-imageio/overview.html.
> >
> > Then you can use the UI (admin portal) or REST API for uploading the iso 
> > image to the relevant storage domain.
>
> Shani, I think Chris asked specifically about booting from an image. See e.g.:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1122970#c34
>
> Is that intended to be handled? It seems like we gave up on removing
> the ISO domain concept, perhaps also because of this missing feature -
> see last few comments of:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1543512
>
> Adding Michal. Michal - IMO we should make up our minds and provide a
> clear view - either undeprecate the ISO domain - remove deprecation
> notices from everywhere - or provide concrete plans to fill the
> missing gaps.

Forcing NFS storage domain in a system with high end FC/iSCSI storage
does not make sense, and introduces reliability issues due to NFS unpredictable
timeouts. We don't want to go back to having NFS on every system.

Uploading to data domain should work for all use cases. If something
does not work (booting from kernel image on data domain) it's a bug,
probably something that was missed when we add the feature to keep iso
disks on block storage.

The issue with data domain is sharing the same domain with multiple DCs.
This is not supported now since only one SPM  can manage the storage
domain (e.g create a new disk). But we have the infrastructure to support
this.

Of course we can support upload to iso domain, this depends on engine setting
up the transfer properly, and probably requires new APIs in vdsm to
create the file
in the iso domain.

Nir
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[ovirt-users] Re: Direct Linux kernel/initrd boot

[Yedidyah Bar David]

On Tue, Jul 27, 2021 at 11:56 AM Shani Leviim  wrote:
>
> Hi Chris,
> Indeed, the ISO domains are deprecated, and you can use a data domain for 
> uploading iso files (as you've mentioned).
> To do that, you need to use image-io for uploading images
>
> Here's image-io documentation: 
> http://ovirt.github.io/ovirt-imageio/overview.html.
>
> Then you can use the UI (admin portal) or REST API for uploading the iso 
> image to the relevant storage domain.

Shani, I think Chris asked specifically about booting from an image. See e.g.:

https://bugzilla.redhat.com/show_bug.cgi?id=1122970#c34

Is that intended to be handled? It seems like we gave up on removing
the ISO domain concept, perhaps also because of this missing feature -
see last few comments of:

https://bugzilla.redhat.com/show_bug.cgi?id=1543512

Adding Michal. Michal - IMO we should make up our minds and provide a
clear view - either undeprecate the ISO domain - remove deprecation
notices from everywhere - or provide concrete plans to fill the
missing gaps.

Best regards,

>
>
> Regards,
> Shani Leviim
>
>
> On Mon, Jul 26, 2021 at 8:56 PM Chris Adams  wrote:
>>
>> I was looking at using direct Linux kernel/initrd booting for a
>> particular automation project, but I'm not sure how to use it.  The docs
>> talk about referencing files from an ISO domain, but those are
>> deprecated (and I don't have one).  Can the files be in a regular data
>> domain?  How would I specify which domain to look in?
>>
>> The docs also say the alternative is to specify a path "on the host",
>> but I guess that requires the files to be copied to the same path on
>> every host that could boot the VM?
>>
>> I guess I can instead make a one-off ISO and upload it to a data domain;
>> it just would be easier to use direct boot.
>> --
>> Chris Adams 
>> ___
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>
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-- 
Didi
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[ovirt-users] Re: Direct Linux kernel/initrd boot

[Shani Leviim]

Hi Chris,
Indeed, the ISO domains are deprecated, and you can use a data domain for
uploading iso files (as you've mentioned).
To do that, you need to use image-io for uploading images


Here's image-io documentation:
http://ovirt.github.io/ovirt-imageio/overview.html.

Then you can use the UI (admin portal) or REST API

for uploading the iso image to the relevant storage domain.



*Regards,*

*Shani Leviim*


On Mon, Jul 26, 2021 at 8:56 PM Chris Adams  wrote:

> I was looking at using direct Linux kernel/initrd booting for a
> particular automation project, but I'm not sure how to use it.  The docs
> talk about referencing files from an ISO domain, but those are
> deprecated (and I don't have one).  Can the files be in a regular data
> domain?  How would I specify which domain to look in?
>
> The docs also say the alternative is to specify a path "on the host",
> but I guess that requires the files to be copied to the same path on
> every host that could boot the VM?
>
> I guess I can instead make a one-off ISO and upload it to a data domain;
> it just would be easier to use direct boot.
> --
> Chris Adams 
> ___
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>
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