[libvirt-users] [libvirt] [LXC] Tyring to locate livbvirt operations for LXC relocation

[Avi Weit]

Hi Daniel,

I wanted to ask on whether virDomainSave/Restore functions of libvirt are
implemented now for the LXC containers? If yes, what libivrt version should
I install please?

Thanks,
- Avi

"Daniel P. Berrange" <berrange at redhat.com> wrote on 04/02/2010 03:44:49 PM:

> From:
>
> "Daniel P. Berrange" <berrange at redhat.com>
>
> To:
>
> Avi Weit/Haifa/IBM at IBMIL
>
> Cc:
>
> libvirt-users at redhat.com
>
> Date:
>
> 04/02/2010 03:45 PM
>
> Subject:
>
> Re: [libvirt-users] [libvirt] [LXC] Tyring to locate livbvirt
> operations for LXC relocation
>
> On Wed, Feb 03, 2010 at 04:03:10PM +0200, Avi Weit wrote:
> >
> > Hello,
> >
> > I am searching for the libvirt operations for relocating LXC (system or
> > application) containers. LXC relocation mechanism is done by
checkpoint /
> > restart. I went over libvirt API documentation and found the following
> > methods:
> >
> > virDomainSave that receives a domain and path to state file. The method
> > saves domain's memory contents into a disk file.
> > virDomainRestore that receives a domain and path to state file. The
method
> > restores the domain from the state file created by save operation.
> >
> > Are these the proper methods to use for LXC relocation? I assume I can
also
> > use the corresponding operations via virsh (save / restore)..
> >
> > >From looking into lxcDriver object (defined
under /src/lxc/xlc_driver.c in
> > libvirt server source) I can see that NULLs are set in save and restore
> > methods. Does that mean that there is no support for saving and
restoring
> > Linux containers? Is there a libvirt patch beyond the kernel patch that
> > needs to be applied?
>
> That is correct - the virDomainSave/Restore functions are intended to
save
> the running guest/container state to a file or load it from a file,
> respectively. These operations have not yet been implemented for
libvirt's
> LXC driver. I'm not sure how mature the kernel support for container
> save/restore is yet, but if it has stabilized sufficiently, then we will
> obviously accept patches from anyone wanting to try implementing...
>
> Daniel
> --
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