DNS-ONLY, ESXi and VMotion migration...work together?

uk01

Well-Known Member
Dec 31, 2009
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Hi,
We currently have host servers using ESXi with CPanel VPS's running.
At the moment, we have the traditional set up, each VPS runs it's own DNS, nameservers etc.

We are looking at:
CPanel DNS ONLY, Clustering & VMWare ESXi extra functionality for live migrations etc

I understand the DNSONLY set up where servers(VPS's in our case) can be clustered to share DNS zones and sync with the 2 DNS ONLY servers (ns1 and ns2).
If a website is transferred from one VPS to another, the dns updates automatically so we can eliminate the task of asking clients to update their nameservers during server migrations.

However, I'd appreciate some clarification on full VPS migrations.
If we migrate a whole vps to another host, this doesn't use the CPanel transfer functionality, so am I right in thinking all the websites in the VPS will have the wrong ip on the new host?

DNSONLY / Clustering supports transfers of websites between VPS's in it's cluster but does it support moving the whole VPS to a different host?

Appreciate any help/advice you can offer
 

24x7server

Well-Known Member
Apr 17, 2013
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You need to have the same vSwitch, Storage on both hosts. Otherwise vmotion won't let you migrate. They should be connected to the same IP subnet if you want to keep the network connection up and running. In any case, if the guest has a fixed IP setup it will keep that one, this is the VM setting.

Basically in a live migration the active memory shares of the guest, from one ESXi host to the other. The IP inside the guest, whether DHCP or Static will not change.
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
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However, I'd appreciate some clarification on full VPS migrations. If we migrate a whole vps to another host, this doesn't use the CPanel transfer functionality, so am I right in thinking all the websites in the VPS will have the wrong ip on the new host?
The DNS zones will update automatically if you use Web Host Manager to change the IP addresses after migrating the server. The IP Migration Wizard is a useful tool for this:

"WHM Home » IP Functions » IP Migration Wizard"

The updated zones will then sync to the cluster.

Thank you.