Re: [libvirt-users] Migration hangs on Gentoo with KVM
[re-adding the list]
On 08/01/2011 04:22 PM, Jonathan Stoppani wrote:
On Aug 1, 2011, at 16:20 , Eric Blake wrote:
> On 08/01/2011 04:11 PM, Jonathan Stoppani wrote:
>> Hi there,
>>
>> I'm trying to migrate a domain between two Gentoo hosts using KVM as
hypervisor, but the migration hangs.
>> I tried both live or offline migration modes without success.
>
> Does your 'nc' command have a -q option? If so, then this is probably
>
> https://bugzilla.redhat.com/show_bug.cgi?id=726174
>
Thanks for the prompt answer Eric! Yes, nc has a q option:
-q, --hold-timeout=SEC1[:SEC2] Set hold timeout(s) for local [and remote]
Glad to hear that we found root cause to your problems, then.
The bug specifically refers to ssh, does that mean that it should work over tcp?
The problem is that libvirt is trying to start a remote nc session over
ssh; but looking at http://libvirt.org/remote.html, it looks like ssh is
the only protocol using nc in that manner (so yes, you can probably
avoid the issue by using tcp or tls). Meanwhile, I think you can work
around it without patching libvirt, by using this as your remote URI:
qemu+ssh://user@remotehost/system?netcat=/path/to/nc-wrapper
where nc-wrapper is an executable script installed on remotehost,
looking like:
#!/bin/sh
exec /path/to/real/nc -q0 "$@"
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org