Since we are familiar with SUSE products, we based our deployment on
the SUSE High Availability docs:
https://documentation.suse.com/en-us/sle-ha/15-SP7/single-html/SLE-HA-installation/index.html
So in short, we run „crm cluster init“ on the bootstrap node, and when
everything works as expected, „crm node join“ on the further nodes. Of
course, there’s some more details required, like the corosync config,
csync2 etc.
Our own cluster was based on openSUSE, but when SUSE discontinued the
OpenStack product, we couldn’t upgrade anymore on openSUSE. So last
year, we reinstalled our cloud on Ubuntu by redeploying a pacemaker
cluster (single node), brought OpenStack back up, then joined the
second server. And it works great, we’re just waiting for the latest
updates to arrive in the distro for better systemd management.
Zitat von Andreas Mock <[email protected]>:
Hi Thomas, hi Eugen,
thank you for the reply.
Is there anywhere a howto to bootstrap such an one node cluster?
Best regards
Andreas
-
-----Ursprüngliche Nachricht-----
Von: Users <[email protected]> Im Auftrag von Eugen Block
Gesendet: Samstag, 2. August 2025 11:18
An: Cluster Labs - All topics related to open-source clustering
welcomed <[email protected]>
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 <[email protected]>:
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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