Open Stack

Hi,

3 nodes requirements come from MySQL galera and RabbitMQ clustering because
of quorum requirements ( it should be in odd numbers 1, 3, 5 etc..). Rest
of components works without clustering and they live behind HAProxy LB for
load sharing and redundancy.

Someone else can add more details here if I missed something.

On Thu, Aug 25, 2022 at 4:05 AM 박경원 <park0kyung0won at dgist.ac.kr> wrote:

> Hello
>
>
> I have two questions about deploying openstack in high available setup
>
> Specifically, HA setup for controller nodes
>
>
> 1. Are openstack services (being deployed on controller nodes) stateless?
>
>
> Aside from non-openstack packages(galera/mysql, zeromq, ...) for
> infrastructure, are openstack services stateless?
>
> For example, can I achieve high availability by deploying two nova-api
> services to two separate controller nodes
>
> by load balacing API calls to them through HAproxy?
>
> Is this(load balancer) the way how openstack achieves high availability?
>
>
>
> 2. Why minimum 3 controller nodes for HA?
>
>
> Is this solely due to etcd?
>
>
> Thanks!
>
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