I have a cluster with 8 hosts where 6 have DNS and NTP settings from a legacy domain and 2 have current settings. The legacy domain controllers are still up and there is a trust between the two. I would like to change the hosts so they are all using the current DNS and NTP servers. The directory services for all the hosts is set to Local Authentication so they are not integrated with AD. What is the impact of changing these settings? What would be the steps to follow? Is it as easy as putting the hosts with legacy settings in maintenance mode, making the change, then bringing them back from maintenance mode?
The steps I ended up taking were:
- added A records in DNS
- put host in maintenance mode (always do this before making any changes)
- remove from vCenter
- connect directly to host and make changes
- add host to vCenter
Everything is up and no issues.
I don't see a reason for doing this in Maintenance Mode. Just make sure the required DNS Host-A entries exist on the new DNS server, and then change the settings on the hosts.
André
What about changing the domain? Does it matter since they are not integrated with AD?
No, there is no downtime required.
The steps I ended up taking were:
- added A records in DNS
- put host in maintenance mode (always do this before making any changes)
- remove from vCenter
- connect directly to host and make changes
- add host to vCenter
Everything is up and no issues.
Yes, Downtime not required
