Actually, what confused me was this: cephadm bootstrap --mon-ip <my-ip> Among other things, this command: - Generates a new SSH key for the Ceph cluster and adds it to the /root/.ssh/authorized_keys file. - Saves a copy of the public key to the /etc/ceph/ceph.pub file. You then need to add a node. ssh-copy-id -f -i /etc/ceph/ceph.pub root@<new-host> ceph orch host add <newhost> [<ip>] [<label1> ...] I wondered where the private part of the SSH key /etc/ceph/ceph.pub was ! -- M Michel Le Cocq via ceph-users <ceph-users@ceph.io> writes:
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!?