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Using CNAME or otherwise to change multiple DOMAIN Records

Posted on 2007-04-05
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Last Modified: 2010-04-10
I am using NAMED andI have several domain names that all need to point to the same IP.

Lets say

www.hello.com
www.goodbye.com
www.welcome.com

Should I want to change that IP among all the domains, I am looking for the most efficient way without editing every domain record.

should I assign an A record to one domain lets say:

hello.com  IN  A  10.0.0.1

and then CNAME the rest to it

welcome.com IN CNAME hello.com

I know this will cause dual lookups I believe. Is there a more efficient way?

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Question by:lexshine
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4 Comments
 

Author Comment

by:lexshine
ID: 18862795
maybe the question doesn't make sense. Let me get to my desired result. if I am running NAMED and have over 150 domain records, is there any way possible to change the IP in 1 record and have the rest follow suit.

I would imagine some method exists for failover setups, etc.

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LVL 71

Expert Comment

by:Chris Dent
ID: 18863132

welcome.com IN CNAME hello.com

Will not be possible, you cannot use a CNAME for a record where other resource records exist. Welcome.com should already have NS and SOA records associated with it, your zone won't load if you add a CNAME in as well.

You can configure CNAME records for www. within a domain though.

HTH

Chris
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Author Comment

by:lexshine
ID: 18867301
Then is there a recommendation for repointing a large amount of domain records

lets say you have 10 domain record files and they all point to 10.0.0.1 as a virtual host.

Is there no way to change one record, and have all the other records also change to that IP? it seems rather limiting, but I cannot find any method of doing this.

Do I have to write a script to regenerate all the domain records with a different IP? it should seem that there would be a way to alias the IN A ip in every record so that you can easily repoint it should u need to.



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LVL 71

Accepted Solution

by:
Chris Dent earned 1500 total points
ID: 18868078

I'm afraid scripting it is the only solution I can offer. Unless you preserve the IP Address when eveything is changed.

If it were anything but the record for the Domain Name itself you'd be fine. It's just a restriction with CNAME records that prevents it being used there.

Chris
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