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[Khoi <2107323@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2107323

Title:
  router ha was split brain when restarting l3 agent docker

Status in neutron:
  New

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

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