[Qemu-devel] Qemu Live Migration: File Descriptor

[Qemu-devel] Qemu Live Migration: File Descriptor

[siddharth srivastava]

Hi

I have been exploring various live migration ways that qemu supports.
In the Qemu Migration documentation at: [1], it is only mentioned how
to invoke tcp and exec migration schemes.
But there is no mention of unix and fd migration schemes.

In the code I see that the argument for tcp, fd,unix and exec goes
into uri. But neither in the code nor in the docs/migration, it is
mentioned what it expects as uri.
So how do you start migration with these schemes ?




[1]: http://www.linux-kvm.org/page/Migration
-- 
Regards
Siddharth Srivastava

Re: [Qemu-devel] Qemu Live Migration: File Descriptor

[Eric Blake]

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On 07/14/2012 08:45 AM, siddharth srivastava wrote:
> Hi
> 
> I have been exploring various live migration ways that qemu supports.
> In the Qemu Migration documentation at: [1], it is only mentioned how
> to invoke tcp and exec migration schemes.
> But there is no mention of unix and fd migration schemes.
> 
> In the code I see that the argument for tcp, fd,unix and exec goes
> into uri. But neither in the code nor in the docs/migration, it is
> mentioned what it expects as uri.
> So how do you start migration with these schemes ?

The libvirt code base exposes all of these migration schemes (although
it currently favors fd: migration wherever possible).  Starting a
migration requires a Unix socket on the monitor command, and passing in
the file descriptor via SCM_RIGHTS via the 'getfd' monitor command prior
to using the 'migrate' monitor command to use that new fd.

-- 
Eric Blake   eblake@redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org




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