** No longer affects: nova
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https://bugs.launchpad.net/bugs/1880389
Title:
lost net connection when live migration
Status in neutron:
New
Bug description:
Description
===========
I find VM will lost net connection when live migration.
I enabled the live_migration_wait_for_vif_plug and set
vif_plugging_timeout=120.
My openstack version is queens, and I used linux bridge as my L2
plugin. and the physical adapter of my host I did bond0 mode.
when the live migration done, I found the ping of VM is broken down,
and I use tcpdump to catch the package, I found the package from
switch still reach the destination host.
Steps to reproduce
==================
1. enable the live_migration_wait_for_vif_plug = True and
vif_plugging_timeout = 120 (remeber restart the linuxbridge-agent in source and
destination host)
2. created a new VM ,and then ping the VM which created in step
3. do the live migration action.(before live migration you need to make sure
the vlan sub_interface of the network which vm attached not in the dest host. )
4. when the processing of live migration, U will found the ping to the VM was
broken down.
Expected result
===============
the ping should not broken down when live migration.
Actual result
=============
the ping was broken down. and the ping package from the physic switch was
still set to the source.
Environment
===========
1. Exact version of OpenStack you are running. See the following
list for all releases: http://docs.openstack.org/releases/
queens
2. Which hypervisor did you use?
Libvirt + KVM
3. Which storage type did you use?
ceph
4. Which networking type did you use?
Neutron with LinuxBirdge
the network type of VM is Vlan type.
And I found the time of 5 RARP from VM is before the time of the vlan
sub interface insert to the linuxbridge bridge when live migration.
maybe this will help us to make sure the problem I found.
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