router ha was split brain when restarting l3 agent docker

[Khoi]

I deploy a multi node cluster with 2 network nodes separately with l3_ha=true and max_l3_agents_per_router=2. It is ok but when I restart neutron_l3_agent on a host which has an active router then 2 routers become standby-standby or active-active.

It is weird because I log in to neutron_l3_agent and see that

/var/lib/neutron/kolla/ha_confs/431e2992-d4c5-42b9-96b3-1c932b6b750f/state have right state on both side but neutron consider ha_state is active-active or standby-standby.

I feel 2 network nodes very easily to split brain. Could I have some ideas on this problem. Thank you.

openstack 2025.1-master
kolla-ansible2025.1 master
ubuntu 22.04

[Lajos Katona (lajos-katona)]

Related mail thread: https://<email address hidden>/thread/PL4DZKMA5UFSLOFLXD6LBP2WNBHKPS3A/

[Lajos Katona (lajos-katona)]

Do you perhaps see any related logs in l3-agent log for the split brain routers?

[Khoi (khoinh5)]

Hello, I will update soon.
Nguyen Huu Khoi

On Tue, Apr 22, 2025 at 4:21 PM Lajos Katona <email address hidden>
wrote:

> ** Changed in: neutron
> Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/2107323
>
> Title:
> router ha was split brain when restarting l3 agent docker
>
> Status in neutron:
> Incomplete
>
> Bug description:
> I deploy a multi node cluster with 2 network nodes separately with
> l3_ha=true and max_l3_agents_per_router=2. It is ok but when I restart
> neutron_l3_agent on a host which has an active router then 2 routers
> become standby-standby or active-active.
>
> It is weird because I log in to neutron_l3_agent and see that
>
>
> /var/lib/neutron/kolla/ha_confs/431e2992-d4c5-42b9-96b3-1c932b6b750f/state
> have right state on both side but neutron consider ha_state is active-
> active or standby-standby.
>
> I feel 2 network nodes very easily to split brain. Could I have some
> ideas on this problem. Thank you.
>
> openstack 2025.1-master
> kolla-ansible2025.1 master
> ubuntu 22.04
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/neutron/+bug/2107323/+subscriptions
>
>

[Launchpad Janitor (janitor)]

[Expired for neutron because there has been no activity for 60 days.]