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Moving VCenter server to Data center from 10.200.x.x to 10.100.x.x network

Hello EE,

I am moving our infrastructure Cisco UCS with VMWare hosts and Vcenter is a virtual machine as well to a Data center going from 10.200.x.x to 10.100.x.x network.

I know vcenter relies on the Domain Controller.  My question if we have a new DC in the 10.100.x.x network and change the IP on Vcenter, do we need to remove the VMs after changing IP information before the move and readd when we get to the data center?
Are there any issues you can offer with physically relocating the vcenter server?
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bergquistcompany
Asked:
bergquistcompany
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1 Solution
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Changing your vCenter IP address will not affect your VMs.

Ensure good DNS resolution and ensure vCenter hostname IP address is updated correctly with new IP address.
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bergquistcompanyAuthor Commented:
if VM's will also become part of the 10.100.x.x should they be removed from vcenter as with the ESXi hosts and then readded at the data center?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
There is no need to remove any VMs from the vCenter or ESXi, if IP Address of VMs is changing.

You will need to change the IP Addresses of VMs, if you want those VMs to be on this new network.
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bergquistcompanyAuthor Commented:
an remove ESXi hosts from VCenter?
My coworker says we need to.

Plan
1. Change IPs on VMs
2. Shut down VMs
3. Change IPs on ESXi hosts
4. Shut down hosts
5. Shut down gracefully
6. move
7. Bring up

He said we need to remove the hosts from VCenter.  Wanted to get your expert recommendation as you've provided great suggestions in the past and don't want to do unnecessary work.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, that plan is about right, you also need to change the IP Address of vCenter Server.

and also make sure all DNS entries are updated with new IP Addresses.
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bergquistcompanyAuthor Commented:
I've confirmed my VMs are in vcenter via name, but my hosts via IP so when I change the IP of the hosts I won't see them via the old IP, thus will need to readd the hosts correct?

But I can still leave the VMs?  Without having to remove?

Got it thanks so much!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, your VMs will not be affected.

You will need to re-ip your Hosts.
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bergquistcompanyAuthor Commented:
Yes I have that step so to confirm I'll have to remove hosts from vcenter and readd but can leave VMs per plan:

1. Change IPs on VMs (including vcenter server)
2. Shut down VMs
3. Change IPs on ESXi hosts
4. Shut down hosts
5. Remove Hosts from vcenter
6. move equipment
7. Bring up DC (update DNS)
8. Bring up vcenter
9. Add hosts
10. bring up VMs

Better?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I think you will need to remove Hosts from vCenter first.

then change the IP Address of Hosts.

the change IP Address of vCenter Server.

Add hosts back to vCenter Server.

Change IP Address of VMs.
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bergquistcompanyAuthor Commented:
If I am changing before the move I won't have access to the VMs after changing the IP of the server so figured I'd have to do servers, vcenter server, hosts.  Then move bring back up and add hosts
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You can access the VMs through the console when connecting to either ESXi or vCenter Server?
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bergquistcompanyAuthor Commented:
but if ESXi and Vcenter are on 10.100.x.x and we are on 10.200.x.x and the VMs on 10.200.x.x wouldn't we want to do it in reverse, change VMs, VCenter and then hosts removing hosts and leaving VMs and after move readd hosts.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Hosts must have IP Addresses changed.

vCenter Server must have IP Addresses changed.

Hosts will need to be removed from vCenter Server. (first before IP Address changed)

vCenter Server could be left to last, VMs will still function on an ESXi server, with an IP Address change.

So you could do all VMs first, and remove hosts from vCenter Server, change vCenter Server IP Address, Change IP Address of Hosts, Add Hosts Backup to vCenter Server.
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chinguettiCommented:
I'm sorry about bringing this thread back alive, but do you have a updated checklist of what you ended up doing bergquistcompany? Is there no way of changing IP segments without having to shut down all VMs?
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