OK. Thank you very much for your input. Understood to never use simpleYou do not need to reboot the nodes, and NEVER use apt upgrade -> it can break your system. use dist-upgrade or full-upgrade
apt upgradeBut the kernel would be also updated, so I think we have to restart the nodes on some point?
If I understood you correctly:
1) Install ALL updates directly on all three nodes with
apt full-upgrade2) Do the rolling restart of Ceph services
3) Do the key exchange
4) Let go all the errors and warnings regarding CephX authentication
5) Then I would restart the nodes? (because of the kernel updates from step 1)
Honestly, we're running PVE since years (12-13?) now and as I can remember we never bricked our systems with the simple
apt upgrade but if you had bad experiences in the past then we should avoid that in the future. Thank you