[Expired for neutron because there has been no activity for 60 days.]
** Changed in: neutron
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1533704
Title:
networking doesn't work for VMs on xen
Status in neutron:
Expired
Bug description:
I didn't experience it myself, I got an email from Tom Carroll
explaining this problem with lots of details. I thought I'd file a bug
so that other people can benefit.
This is the report:
"I've been attempting to use liberty neutron on XenServer and I've
noticed some changes that make it difficult to do so. These changes
begin with commit 3543d8858691c1a709127e25fc0838e054bd34ef, the
delegating of is_active() to AsyncProcess.
The root cause of the problem is that the root helper, in this,
neutron-rootwrap-xen-dom0, runs in a domU, but executes commands in
dom0.
In this scenario, AsyncProcess.pid returns None. This is due to trying
to travel from the root helper down to leaf children. And again, the
children are running in a different dom. As a consequence,
AsyncProcess.is_active() returns false, causing the ovsdb client to be
eventually respawned.
Another complicating scenario, is neutron-rootwrap-xen-dom0
communicates with dom0 using an XMLRPC style protocol. It reads the
entire stdin, launches the command in dom0 providing the buffer to
stdin, reads the entire stdout, and responds back. If the command
never ends, a response will never be returned.
The end result is that new interfaces are never annotated with the
proper 1Q tag, which means that the network is inoperable for the VM.
A complete restart of the neutron agent, fixesup the networking."
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