kolla-ansible/releasenotes/notes/serial-l3-agent-restart-with-delay-7c2ec5875dbb760e.yaml
Alex-Welsh 391aa4677f Adding optional delay between l3 agent restarts
This change serialises the neutron l3 agent restart process and adds a
user configurable delay between restarts. This can prevent connectivity
loss due to all agents being restarted at the same time.

Routers increase the recovery time, making this issue more prevalent.

Change-Id: I3be0ebfa12965e6ae32d1b5f13f8fd23c3f52b8c
2023-01-23 09:14:59 +00:00

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YAML

---
fixes:
- |
In HA mode, parallel restart of neutron-l3-agent containers will cause
a network outage. Adding routers increases the recovery time. This
release makes restarts serial and adds a user-configurable delay to ensure
each agent is returned to operation before the next one is restarted.
The default value is 0. A nonzero starting value would only result in
outages if the failover time was greater than the delay, which would be
more difficult to diagnose than consistent behaviour.