Re: [Qemu-devel] [libvirt] Fail to start 2nd guest

[Peter Krempa <pkrempa@redhat.com>]

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On Mon, Feb 27, 2017 at 13:31:30 +0000, Stefan Hajnoczi wrote:
> On Mon, Feb 27, 2017 at 08:50:03PM +0800, Xiong Zhou wrote:
> > On Mon, Feb 27, 2017 at 10:11:04AM +0000, Stefan Hajnoczi wrote:
> > > On Mon, Feb 27, 2017 at 05:40:50PM +0800, Xiong Zhou wrote:

[...]

> > > > sh-4.2# virsh start 73us
> > > > error: Failed to start domain 73us
> > > > error: internal error: qemu unexpectedly closed the monitor: ((null):11497): Spice-Warning **: reds.c:2499:reds_init_socket: listen: Address already in use
> > > > 2017-02-27T09:33:42.335708Z qemu-kvm: failed to initialize spice server
> > > 
> > > The error message says that the spice remote desktop cannot listen on
> > > -spice port=5900,addr=127.0.0.1.
> > > 
> > > Did you hardcode port 5900 in the domain XML?  That could explain why
> > No.
> > > the second guest fails to launch - you need to use unique port numbers
> > > or let libvirt automatically assign them.  Check the domain XML:
> > > 
> > >   <graphics type='spice' port='-1' tlsPort='-1' autoport='yes'>
> > 
> > It looks like:
> > 
> >     <graphics type='spice' autoport='yes'>
> >       <listen type='address'/>
> >       <image compression='off'/>
> >     </graphics>
> > 
> > 
> > > 
> > > Another possibility is that a process running on the host is already
> > > using port 5900.  Perhaps a guest or VNC server that was launched
> > > outside of libvirt?  You can check this with:
> > > 
> > >   netstat -alpn | grep 5900
> > # netstat -alpn | grep 5900
> > tcp        0      0 127.0.0.1:5900          0.0.0.0:*               LISTEN      11065/qemu-kvm      
> 
> Please check that 11065/qemu-kvm was launched by the same libvirtd and
> its domain XML also uses autoport='yes'.
> 
> I have CCed the libvirt mailing list because they may be able to explain
> why there is a collision on TCP port 5900.

There was a bug in the code. There could be a race between startup of
two VMs:
https://bugzilla.redhat.com/show_bug.cgi?id=1397440

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