Hi again.

I'm answering my own question.

It seems I read the wrong version of the doc
... sic!

It should be enough to set the “_admin” flag on all nodes:

and that we also need to install cephadm on the nodes we
want to use for administration, right!?

--
M

Michel Le Cocq via ceph-users <[email protected]> writes:

> Hi all,
>
> I am currently deploying a Ceph cluster with cephadm on 3 nodes with
> MON, MGR, and MDS roles. OSDs will be added later. 
>
> My goal is for these 3 nodes to be fully interchangeable, with the
> ability to administer the cluster from any of them without risk if a
> node fails. 
>
> I have identified that the solution involves synchronizing
> /var/lib/ceph/ (excluding the bootstrap file) across all nodes. 
>
> However:
>
> - Is this the right approach to achieve this goal?
>
> - Which tool should I use for reliable bidirectional synchronization?
>
> - What are the potential risks (conflicts, corruption) and precautions
>   to take? 
>
> Have you implemented such a configuration in production before?
>
> Thank you for your advice.
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