yahoo-eng-team team mailing list archive

[Sean Dague <sean@xxxxxxxxx>]

What real world scenario would you expect to expose a situation where
the neutron environment is turned off and nova-compute is restarted?
This seems pretty synthetic, and the fact that it recovers ones the
neutron agent restarts seems like most of the environment is working as
expected.

** Changed in: nova
       Status: New => Incomplete

** Changed in: nova
       Status: Incomplete => Opinion

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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):
  Opinion

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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