On Wed, 2020-10-21 at 13:05 +0000, Zhi CZ Chang wrote:

Hi, all   I met some nova live-migration problems with the U version.   My env is one controller + two compute nodes. Here are the steps:

1. Create a VM at comp;
2. Live-migrate the VM from comp to comp2;
3. Live-migration success;
4. Live-migrate the VM from the comp2 to comp
5. Live migration fail

I find that there are duplicate records in the neutron's "ml2_port_bindings" table: MariaDB [neutron]> select * from ml2_port_bindings where port_id="71c3a3c7-d853-4b26-9975-50b99c449371"; +--------------------------------------+-------+----------+-----------+---------------------------+------------------------------------------------- --------------------------------------------------------------------------+----------+ | port_id | host | vif_type | vnic_type | profile | vif_details                                  | status | +--------------------------------------+-------+----------+-----------+---------------------------+------------------------------------------------- --------------------------------------------------------------------------+----------+ | 71c3a3c7-d853-4b26-9975-50b99c449371 | comp | unbound | normal | {"migrating_to": "comp2"} |                                  | INACTIVE | | 71c3a3c7-d853-4b26-9975-50b99c449371 | comp2 | ovs | normal | {} | {"connectivity": "l2", "port_filter": true, "ovs_hybrid_plug": false, "datapath_type": "system", "bridge_name": "br-int"} | ACTIVE | +--------------------------------------+-------+----------+-----------+---------------------------+------------------------------------------------- --------------------------------------------------------------------------+----------+   Here is a duplicate record generated.   Why does nova or neutron generate an INACTIVE record in neutron's DB?

this is by design https://specs.openstack.org/openstack/nova-specs/specs/rocky/implemented/neu...

I have filed a bug at https://bugs.launchpad.net/nova/+bug/1900843.

ill take a look at the bug but that failure is like not realted to the multiple port binding recoreds as we have done that intetionally since rocky

Please feel free to give me some advice.       Thanks Zhi Chang