Need to merge 2 VPS's into 1 without customers being affected?

Hi,
I currently have 4 VPS's and want to merge 2 of them without disrupting my customers being moved.

First VPS has name servers ns1.myfirstaddress.com & ns2.myfirstaddress.com with a host name of host.myfirstaddress.com

Second VPS has name servers ns1.mysecondaddress.com & ns2.mysecondaddress.com with a host name of host.mysecondaddress.com

Currently at my domain registrar I have child name servers pointing to the different server IP's

Child Nameservers
ns1.myfirstaddress.com 122.123.33.44
ns1.myfirstaddress.com 122.123.33.45

Child Nameservers
ns1.mysecondaddress.com 201.203.46.53
ns1.mysecondaddress.com 201.203.46.53

Is this poosible and if so how would I do it?

Could I just change the second set of  Child Nameservers to point to 122.123.33.44 & 122.123.33.45 and setup an A record for host.mysecondaddress.com to be the same as host.myfirstaddress.com then copy all accounts using cPanel/WHM?

Thanks,

Andrew
sabecsAsked:
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Steve KnightIT ConsultancyCommented:
What services are you running on the servers for users, the rest is just DNS resolving assuming your clients aren't talking direct to ip addresses at all?

Are you hosting DNS on the boxes or just pointing DNS records addresses at them?
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sabecsAuthor Commented:
I am running apache web server and BIND DNS Server.
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sabecsAuthor Commented:
Sorry just noticed that I should have had

Child Nameservers
 ns1.myfirstaddress.com 122.123.33.44
 ns2.myfirstaddress.com 122.123.33.45

Child Nameservers
 ns1.mysecondaddress.com 201.203.46.53
 ns2.mysecondaddress.com 201.203.46.53
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Steve KnightIT ConsultancyCommented:
Still a little confused what you have there as is difficult to see with made up names etc. (though don't expect you to post real).

If you are running secondary DNS or primary DNS servers on these boxes then do the same on the box you want to keep.

If the DNS name server records point at the server you want to remove then point them at the other servers - just change your IP addreses  in the A records in th at domain.

Then to Apache you need the content on the new box and for it to respon with the right data based on the website requested in the request headers.  Only time this can get messier is when more than one site uses SSL and you have one IP.

So sorry it isn't much of answer but not too much to go on.

Steve
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