Open Stack

Hi Midhunlal,

If your infrastructure services which should have minimal 3 nodes to form a
quorum (like RabbitMQ and Mariadb and potentially some additional services
If you are using some)
are running on controller nodes, you should have 3 controllers.

If you are HW limited, you also can have 2 nodes, but you can expect some
form of split-brain in future.
If you still will have only 2 controllers,

1. you should consider to use mariadb arbitrator for mariadb (member of
quorum, not replicating data) which should be in some third location
2. Handle cluster_partition_handling in rabbitmq config (probably autoheal
for two nodes)

Next you have to prepare some loadbalancer (haproxy, nginx , apache ? ),
some HA solution (keepalived ? with virtualiP ) and add that two
controllers as backends.
Edit endpoints to point to HA virtualIP address of loadbalancer

That's  minimal I think.

Michal Arbet
Openstack Engineer

Ultimum Technologies a.s.
Na Poříčí 1047/26, 11000 Praha 1
Czech Republic

+420 604 228 897
michal.arbet at ultimum.io
*https://ultimum.io <https://ultimum.io/>*

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pá 20. 8. 2021 v 10:57 odesílatel Midhunlal Nb <midhunlaln66 at gmail.com>
napsal:

> Hi Mohammed,
> If you have any documents  or procedure for this set up ,then please share
> with me.
>
> On Fri, Aug 20, 2021, 10:35 AM Mohammed Naser <mnaser at vexxhost.com> wrote:
>
>> Most openstack services are stateless but a lot of the infrastructure
>> services like RabbitMQ and MariaDB form a quorum therefore need at least 3
>> replicas or you might have a bad time if an outage occurs
>>
>> On Fri, Aug 13, 2021 at 10:36 PM Midhunlal Nb <midhunlaln66 at gmail.com>
>> wrote:
>>
>>> Hi team,
>>> I have a rocky installed openstack environment  and it is working
>>> fine.In my set up I have;
>>>
>>> 1 controller node,2 compute nodes  and 1 storage node.
>>>
>>> Now we are planning to add 1 more controller node as standby.Is it
>>> possible to add 1 more controller node in existing set up? if it is
>>> possible ,anyone please share the procedure.
>>>
>>>
>>> Thanks & Regards
>>> Midhunlal N B
>>> +918921245637
>>>
>>> --
>> Mohammed Naser
>> VEXXHOST, Inc.
>>
>
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