Re: [Qemu-devel] [sheepdog] [PATCH v2 0/9] sheepdog: reconnect server after connection failure

[MORITA Kazutaka]

At Wed, 24 Jul 2013 16:28:30 +0800,
Liu Yuan wrote:
> 
> On Wed, Jul 24, 2013 at 04:56:24PM +0900, MORITA Kazutaka wrote:
> > Currently, if a sheepdog server exits, all the connecting VMs need to
> > be restarted.  This series implements a feature to reconnect the
> > server, and enables us to do online sheepdog upgrade and avoid
> > restarting VMs when sheepdog servers crash unexpectedly.
> > 
> 
> It doesn't work on my test. I tried start linux-0.2.img stored in sheepdog
> cluster and then
> 
> 1. did some buffered writes
> 2. restart sheep that this QEMU VM connected to.
> 3. $ sync
> 
> I got following error:
> 
> $ ../qemu/x86_64-softmmu/qemu-system-x86_64 --enable-kvm -m 1024 -hda 
> sheepdog:test
> qemu-system-x86_64: failed to get the header, Resource temporarily unavailable
> qemu-system-x86_64: Failed to connect to socket: Connection refused
> qemu-system-x86_64: Failed to connect to socket: Connection refused
> qemu-system-x86_64: Failed to connect to socket: Connection refused
> qemu-system-x86_64: Failed to connect to socket: Connection refused
> qemu-system-x86_64: Failed to connect to socket: Connection refused
> ...repeat...
> 
> QEMU version is master tip

Your sheep daemon looks like unreachable from qemu.  I tried the same
procedure, but couldn't reproduce it.

Is the problem reproducible?  Can you make sure that you can connect
to the sheep daemon from collie while the error message shows up?

Thanks,

Kazutaka