** Changed in: nova
Status: Opinion => Confirmed
** Changed in: nova
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1670628
Title:
nova-compute will try to re-plug the vif even if it exists for
vhostuser port.
Status in OpenStack Compute (nova):
Confirmed
Bug description:
Description
===========
In mitaka version, deploy neutron with ovs-dpdk.
If we stop ovs-agent, then re-start the nova-compute,the vm in the host will
get network connection failed.
Steps to reproduce
==================
deploy mitaka. with neutron, enabled ovs-dpdk, choose one compute node, where
vm has network connection.
run this in host,
1. #systemctl stop neutron-openvswitch-agent.service
2. #systemctl restart openstack-nova-compute.service
then ping $VM_IN_THIS_HOST
Expected result
===============
ping $VM_IN_THIS_HOST would would success
Actual result
=============
ping $VM_IN_THIS_HOST failed.
Environment
===========
Centos7
ovs2.5.1
dpdk 2.2.0
openstack-nova-compute-13.1.1-1
Reason:
after some digging, I found that nova-compute will try to plug the vif every
time when it booting.
Specially for vhostuser port, nova-compute will not check whether it exists
as legacy ovs,and it will re-plug the port with vsctl args like "--if-exists
del-port vhuxxxx".
(refer
https://github.com/openstack/nova/blob/stable/mitaka/nova/virt/libvirt/vif.py#L679-L683)
after recreate the ovs vhostuser port, it will not get the right vlan tag
which set from ovs agent.
In the test environment, after restart the ovs agent, the agent will
set a proper vlan id for the port. and the network connection will be
resumed.
Not sure it's a bug or config issue, do I miss something?
there is also fp_plug type for vhostuser port, how could we specify it?
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