[Bug 997978] Re: KVM images lose connectivity with bridged network

[BenKochie]

So I'm sorry to report that after about 50 days of uptime on qemu-kvm
(1.0+noroms-0ubuntu14.3) I had 3 VMs out of ~60 in my cluster drop off
the network.  It happened on different host machines, so it's not a
single machine in the cluster that's a problem.

Two of the nodes were restarted (full qemu shutdown/relaunch) so I
didn't have a chance to debug them.

One of them I was able to console and work on before I gave up and
restarted it.  The interesting things I discovered was that the
workarounds I had done in the past did not work.  Previously I was able
to ifdown/ifup the virtual interface to restore networking.  Also
migrating between nodes did not restore networking.

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https://bugs.launchpad.net/bugs/997978

Title:
  KVM images lose connectivity with bridged network

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