[ClusterLabs] Creating pacemaker cluster starting with one node

[Andreas Mock]

Hi Thomas, hi Eugen,

thank you for the reply.

Is there anywhere a howto to bootstrap such an one node cluster?

Best regards
Andreas


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-----Ursprüngliche Nachricht-----
Von: Users <users-bounces at clusterlabs.org> Im Auftrag von Eugen Block
Gesendet: Samstag, 2. August 2025 11:18
An: Cluster Labs - All topics related to open-source clustering welcomed <users at clusterlabs.org>
Betreff: Re: [ClusterLabs] Creating pacemaker cluster starting with one node

Hi,

that's how we usually set up our Openstack cluster(s). We bootstrap our first node so we have a single-node pacemaker cluster running all Openstack control services, then "join" the other control nodes, expanding the cluster.
I'd recommend to practice in a test cluster, that has helped me a lot!

Regards,
Eugen

Zitat von Tomas Jelinek <tojeline at redhat.com>:

> Hi Andreas,
>
> From the point of view of pcs, pacemaker and corosync, it is possible 
> to create a one-node cluster, run resources in it, and  add another 
> node afterwards. Obviously, when the single node is lost for whatever 
> reason, there is no other node to run the resources.
>
> You should also consider whether the cluster's workload supports this 
> and what steps are necessary to make it work in this scenario.
>
> Regards,
> Tomas
>
>
> Dne 31. 07. 25 v 8:46 Andreas Mock napsal(a):
>> Hi all,
>>
>> I have to upgrade an old pacemaker cluster consisting of two nodes.  
>> (There is no chance of rolling update).
>>
>> Is it possible to create a pacemaker “cluster” starting with only one 
>> node and afterwards attach the second node?
>>
>> Best regards
>>
>> Andreas
>>
>>
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