Instance get 2 interfaces but it was created with one network

[MarginHu]

Hi Guys,

I met an strange issue. when creating a vm with one network , but it appeared two network interfaces and two ip addresses.

It seems like https://ask.openstack.org/en/question/85238/instance-getting-two-ip-addresses/

In nova-scheduler.log, we can see it happened failure when boot the instance on "cloud-sz-compute-b11-01" node, then successfully created on another node.

nova-scheduler.log:116801:2017-10-10 18:00:24.065 7 INFO nova.scheduler.filters.retry_filter [req-5c1d8f07-6d8a-4c49-ad4b-6ff92489a16a 1cd0fefcd3c242d3aea7850b887c2f40 568f2d41ff904e91b927a1ed5a2fedd5 - - -] Host [u'cloud-sz-compute-b11-01', u'cloud-sz-compute-b11-01'] fails. Previously tried hosts: [[u'cloud-sz-compute-b11-01', u'cloud-sz-compute-b11-01']。

I think it is a bug.
Otherwise ,I can easily make the issue reproducible in my environment.

[Takashi Natsume (natsume-takashi)]

There is a similar bug report.

network not always cleaned up when spawning VMs
https://bugs.launchpad.net/nova/+bug/1597596