Install controller computehci on 3 nodes with tripleO

wodel youchi wodel.youchi at
Mon Sep 20 16:18:42 UTC 2021


Thanks, your answer about pacemaker raised another question, VM (instances)
high availability is managed by peacemaker in TripleO, could this be a
problem when using HCI deployment?


Le lun. 20 sept. 2021 à 16:59, John Fulton <johfulto at> a écrit :

> On Mon, Sep 20, 2021 at 11:46 AM wodel youchi <wodel.youchi at>
> wrote:
> >
> > Hi,
> >
> > Is it technically possible to install openstack tripleO on 3 nodes, such
> that all 3 nodes play the roles of controller compute and ceph storage
> (hci) at the same time, with replication and HA and all?
> It's technically possible for a POC (just compose a role [1]
> accordingly) but it's not a recommended configuration because the
> controllers use pacemaker with power fencing which you don't want
> running on your OSD hosts. E.g. pacemaker could take out 1/3rd of your
> OSDs and make the cluster backfill. If you're short on nodes then one
> option is to use four. One as a basic KVM hypervisor to host VMs
> including a virtual undercloud and three virtual controllers. Then use
> three physical HCI nodes which host the VMs and OSDs.
>   John
> [1]
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