nova-compute restart leads to instance downtime when isolate_vif=True is used

[Vasyl Saienko]

Since nova moved to use os-vifs library to initialise interfaces and when isolate_vif is set to True
https://github.com/openstack/os-vif/commit/d291213f1ea62f93008deef5224506fb5ea5ee0d
During nova-compute service restart it calls plug_vifs https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L1238 as result when isolate_vif is enabled we change vlan on ports to dead VLAN which leads to instance downtime.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/os-vif/+/885127
Committed: https://opendev.org/openstack/os-vif/commit/0a0dec37e42e220ffa750650027714bd7289faa1
Submitter: "Zuul (22348)"
Branch: master

commit 0a0dec37e42e220ffa750650027714bd7289faa1
Author: Vasyl Saienko <email address hidden>
Date: Fri Jun 2 11:52:59 2023 +0000

    Don't break traffic if port already exists

    Nova compute service plugs VIF on service init, it triggers
    rules reinitialization for iptables filter. But it breaks
    traffic in case isolate_vif is used by assigning dead VLAN
    to the port. This patch prevents dead VLAN assingment
    for ports that exists.

    Co-Authored-By: <email address hidden>

    Closes-Bug: #2023300

    Change-Id: Ib1b7467fce9facfbfcd698bf6e9f950c0cead650

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/os-vif 3.3.0 release.