rbd export to stdout ?

rbd export to stdout ?

[Alexandre DERUMIER]

Hi,

I'm looking for use "rbd export " to stdout and not a file.

Is it possible ? any hint ?

Regards,

Alexandre Derumier

Re: rbd export to stdout ?

[Wido den Hollander]

On 10/22/2012 12:41 PM, Alexandre DERUMIER wrote:
> Hi,
>
> I'm looking for use "rbd export " to stdout and not a file.
>
> Is it possible ? any hint ?
>

No, not at this moment. I tried a fifo, but that won't work due to 
O_EXCL and O_CREATE the rbd command uses.

I think it should be possible to export to stdout, but it will require 
some code changes.

I created a feature request for it: http://tracker.newdream.net/issues/3380

Wido

> Regards,
>
> Alexandre Derumier
> --
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>

Re: rbd export to stdout ?

[Alexandre DERUMIER]

ok, 
thanks Wido.

Regards,

Alexandre

----- Mail original ----- 

De: "Wido den Hollander" <wido@widodh.nl> 
À: "Alexandre DERUMIER" <aderumier@odiso.com> 
Cc: ceph-devel@vger.kernel.org 
Envoyé: Lundi 22 Octobre 2012 13:58:40 
Objet: Re: rbd export to stdout ? 

On 10/22/2012 12:41 PM, Alexandre DERUMIER wrote: 
> Hi, 
> 
> I'm looking for use "rbd export " to stdout and not a file. 
> 
> Is it possible ? any hint ? 
> 

No, not at this moment. I tried a fifo, but that won't work due to 
O_EXCL and O_CREATE the rbd command uses. 

I think it should be possible to export to stdout, but it will require 
some code changes. 

I created a feature request for it: http://tracker.newdream.net/issues/3380 

Wido 

> Regards, 
> 
> Alexandre Derumier 
> -- 
> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in 
> the body of a message to majordomo@vger.kernel.org 
> More majordomo info at http://vger.kernel.org/majordomo-info.html 
> 
--
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Re: rbd export to stdout ?

[Alexandre DERUMIER]

note:

import for stdin already work:

rbd import --size=xxx - image < stdin

from this patch

http://permalink.gmane.org/gmane.comp.file-systems.ceph.devel/6315



----- Mail original ----- 

De: "Alexandre DERUMIER" <aderumier@odiso.com> 
À: "Wido den Hollander" <wido@widodh.nl> 
Cc: ceph-devel@vger.kernel.org 
Envoyé: Lundi 22 Octobre 2012 14:25:33 
Objet: Re: rbd export to stdout ? 

ok, 
thanks Wido. 

Regards, 

Alexandre 

----- Mail original ----- 

De: "Wido den Hollander" <wido@widodh.nl> 
À: "Alexandre DERUMIER" <aderumier@odiso.com> 
Cc: ceph-devel@vger.kernel.org 
Envoyé: Lundi 22 Octobre 2012 13:58:40 
Objet: Re: rbd export to stdout ? 

On 10/22/2012 12:41 PM, Alexandre DERUMIER wrote: 
> Hi, 
> 
> I'm looking for use "rbd export " to stdout and not a file. 
> 
> Is it possible ? any hint ? 
> 

No, not at this moment. I tried a fifo, but that won't work due to 
O_EXCL and O_CREATE the rbd command uses. 

I think it should be possible to export to stdout, but it will require 
some code changes. 

I created a feature request for it: http://tracker.newdream.net/issues/3380 

Wido 

> Regards, 
> 
> Alexandre Derumier 
> -- 
> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in 
> the body of a message to majordomo@vger.kernel.org 
> More majordomo info at http://vger.kernel.org/majordomo-info.html 
> 
-- 
To unsubscribe from this list: send the line "unsubscribe ceph-devel" in 
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RE: rbd export to stdout ?

[Dietmar Maurer]

> Subject: Re: rbd export to stdout ?
> 
> On 10/22/2012 12:41 PM, Alexandre DERUMIER wrote:
> > Hi,
> >
> > I'm looking for use "rbd export " to stdout and not a file.

I thought we should extend 'qemu-img', adding import/export there? That
way it would work for all qemu storage drivers?

Re: rbd export to stdout ?

[Alexandre DERUMIER]

>>I thought we should extend 'qemu-img', adding import/export there? That 
>>way it would work for all qemu storage drivers? 

seem to be already possible:

http://ceph.com/wiki/QEMU-RBD

"qemu-img convert -f qcow2 -O rbd /data/debian_lenny_amd64_small.qcow2 rbd:data/lenny"



----- Mail original ----- 

De: "Dietmar Maurer" <dietmar@proxmox.com> 
À: "Wido den Hollander" <wido@widodh.nl>, "Alexandre DERUMIER" <aderumier@odiso.com> 
Cc: ceph-devel@vger.kernel.org 
Envoyé: Lundi 22 Octobre 2012 16:31:00 
Objet: RE: rbd export to stdout ? 

> Subject: Re: rbd export to stdout ? 
> 
> On 10/22/2012 12:41 PM, Alexandre DERUMIER wrote: 
> > Hi, 
> > 
> > I'm looking for use "rbd export " to stdout and not a file. 

I thought we should extend 'qemu-img', adding import/export there? That 
way it would work for all qemu storage drivers? 
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RE: rbd export to stdout ?

[Dietmar Maurer]

> >>I thought we should extend 'qemu-img', adding import/export there?
> >>That way it would work for all qemu storage drivers?
> 
> seem to be already possible:
> 
> http://ceph.com/wiki/QEMU-RBD
> 
> "qemu-img convert -f qcow2 -O rbd
> /data/debian_lenny_amd64_small.qcow2 rbd:data/lenny"

Oh -  I missed that. Thanks for the hint.