At the moment on our ESXi Server are 10 VMs running. One of the VM is the Domain Controller (Windows Server 2008 R2). On this Domain Controller are role like AD, DNS, DHCP and Wins installed. The hole company has only one Domain Controller. Now, we want to upgrade this Domain Controller to two redudant Windows Server 2012 Domain Controllers. One of this two would be the primary DC and the other one the secondary DC. Afther the upgrade, we want to decommission the Domain Controller (Windows Server 2008 R2).
Servername / IP-Adresse of the existing Domain Controller (Windows Server 2008 r2): DCBLN / 192.168.1.150 Servername / IP-Adresse of the new Domain Controller (Windows Server 2012) (Primary): DCBLN01 / 192.168.1.150 Servername / IP-Adresse of the new Domain Controller (Windows Server 2012) (Secondary): DCBLN02 / 192.168.1.151
Im unsure how can I realize this migration at the best. That is why, I need your help. I hope you can give me a feedback, if my workflow has room for improvement:
- Install the Server DCBLN02 (Windows Server 2012) with their roles (AD(add to the existing forest)), DNS(configure as secondary) and Wins(replicate with the DCBLN)) and configure the Domain Controller as the secondary Domain Controller in the forest.
- After that I would install the Server DCBLN01 with their roles (AD(add to the existing forest), DNS(as secondary), DHCP, Wins). And here i have to make sure, that this server has temporary another IP-Adress (maybe 192.168.1.149). Make sure that DCBLN02 replicates with DCBLN01.
- Remove roles on DCBLN AD(make sure that the option "This server is the last domain controller in the domain" is unchecked), DNS, DHCP and shut down this server.
- After shutdown the Server DCBLN, i would clean the DHCP reservation of this Server and the DNS Host A entry and after that I would change the IP Adresse of the Server DCBLN01 to 192.168.1.154 and set the DNS on this server under zone options as the primary.
My aim is, that the other 10VMs has very short downtime. Would this be the correct and clean way to migrate my server? I hope you can give me a feedback. Thank you.