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We host several websites but in most cases the client hosts their own DNS and mail separately.

I want to set up a system where we will create a subdomain on our domain for each client site which will act as the clients A record, so we can control the IP.

For example on the clients name server for domain clientwebsite.com set up:

@    CNAME clientwebsite.sharedhostingenv.com
www  CNAME clientwebsite.sharedhostingevn.com

And on our name servers create the subdomain on sharedhostingenv.com:

clientwebsite IN A 222.33.55.66

Will the fact that the client no longer hosts their own A record have any effect on any other records they have? Will this adversely affect any MX records that the client hosts?

edit: Thank you for the feedback!!! I can't comment, but cheers.

Herbert J. Derkersville
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Herbert J. Derkersville
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  • Regarding your edit: it seems you have created two different profiles, because you should always be able to comment on your own questions. See [this page](http://serverfault.com/help/merging-accounts) to get that resolved. – HBruijn Sep 13 '16 at 06:49
  • In general when you want to say "thank you," [vote up](http://serverfault.com/help/privileges/vote-up) that person's answer, or simply pay it forward by providing a great answer to someone else's question. - See [this FAQ page](http://serverfault.com/help/someone-answers) with regards to the etiquette on ServerFault and related sites. - For an Answer to a Question you yourself asked then you additionally have the option to accept it as the correct answer... - Of course you can also completely disagree with an answer as well and vote down ;) – HBruijn Sep 13 '16 at 06:49

1 Answers1

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Don't do this: 

@    CNAME clientwebsite.sharedhostingenv.com

That will break all other resource records for your clients domain. See this Q&A for a long explanation.

Second when using FQDN's in DNS zones, do not omit the trailing . dot.
In DNS shorthand an entry such as clientwebsite.sharedhostingevn.com in your client's example.com. DNS zone effectively becomes: clientwebsite.sharedhostingevn.com.example.com.

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HBruijn
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