Use redundancy between multiple controller nodes [kolla]

Pierre Riteau pierre at
Tue Jul 19 14:54:44 UTC 2022

The main thing you have to enable in Kolla Ansible is Neutron L3 HA, which
is disabled by default. See enable_neutron_agent_ha.
Other services should be redundant when using multiple controllers.

On Tue, 19 Jul 2022 at 16:48, A Monster <amonster369 at> wrote:

> Thank you for the clarification.
> So I should let the handling of redundancy to keepalive and haproxy
> instead of using external tools.
> On Tue, 19 Jul 2022 at 15:21, Sean Mooney <smooney at> wrote:
>> On Tue, 2022-07-19 at 13:51 +0100, A Monster wrote:
>> > I've deployed openstack xena using *kolla-ansible* on *centos 8 stream*,
>> > I've used multiple controller nodes, a bunch of compute nodes and a
>> storage
>> > cluster.
>> > Controller nodes include network services.
>> >
>> > I want to know how can I successfully set up redundancy between these
>> > controller nodes, in a way that some nodes are active while others are
>> on
>> > standby state, and would only become active in case when the active
>> nodes
>> > are to fail.
>> in generall that is not needed with openstack.
>> most service are partly or mostly stateless using the db to store any
>> relevent persitent state.
>> that generally menas that for example you can have n nova api process
>> active at any time and
>> you do not need to use external managment fo the serivce to have some be
>> active and other be passive.
>> in general such active/standby configurtation is an antipatter and should
>> not need to be done with openstack.
>> in kolla keepalived and haproxe shoudl migrate the contol plane vips and
>> include/exclude donw services automaiticaly.
>> if you want to manually take over that function its likely possibel but
>> not how HA is intended to work in general.
>> i dont work on kolla anymore so perhapse there perspectiive has change
>> but in generaly i would advocat for active active
>> ha in preference ot active standby.
>> >
>> > Thank you. Regards
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