What Univention say on this…
In environments with more than one UCS system, the update order of the UCS systems must be borne in mind:
The authoritative version of the LDAP directory service is maintained on the Primary Directory Node (formerly referred to as master domain controller) and replicated to all the remaining LDAP servers of the UCS domain. As changes to the LDAP schema can occur during release updates, the Primary Directory Node must always be the first system to be updated during a release update.
So reading that would indicate you cannot do a DC backup with later SW than the Master.
so maybe put your DC backup at 4.9
can you not find some down time and just make your /boot larger… either :
- with “gparted”
2 by making a new boot partition, copying the old one’s contents over (you can do this hot), then modify the fstab
file to hand over on the next reboot.