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I had records in my DNS panel:

subdomain   type        domain                      priority (for MX)
@           CNAME       app-***
@           MX                  10
mail        CNAME
www         CNAME       app-***    

Abd so, first line overwrite other.

Question: what to do with that all? I can't create A record because IP of app-* can be dynamic.

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CNAME records can not be on the SOA for a domain, so @ cannot be a CNAME. – Wesley Apr 2 '13 at 19:34
(or rather should not be. I have heard of some allowances for that.) – Wesley Apr 2 '13 at 19:41

Your @ record can't be a CNAME without side effects, one of which is breaking MX records. appears to be down, but you'd need to ask them how they handle these "apex records".

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How does a CNAME @ record break MX records? In his case, his MX is pointed to a totally different domain. I know some MTAs will fall back to using the A record of a domain if no MX exists, but that doesn't actually "break" the MX record. – Wesley Apr 2 '13 at 19:30
@WesleyDavid CNAME records can only coexist with records related to DNSSEC anything else is a violation of rfc2181 section 10.1. This would be the same reason why @ cannot use CNAME (i.e. it cannot coexist with SOA and NS records). Actual implementation in nameservers may vary. – 84104 Apr 3 '13 at 22:09
@WesleyDavid CNAME and other data error is the usual complaint -- in this case you'd have a CNAME that has the same name as (at least) the SOA, which is verboten per the RFCs 84104 quoted .(I believe BIND throws a fit about such things and refuses to even load the zone until you read the RFC and perform an act of contrition) – voretaq7 Apr 4 '13 at 18:40
We should mention that you may have an A ("address") record for @. That's very common so people can use URLs where the hostname in the URL is only the domain name. So you can lookup the IP of the CNAME and put an A record with that IP address. – Craig Constantine Apr 4 '13 at 19:32

Yes A records are dynamic with OpenShift service but you can try suggestions put together here:

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I have found a solution!


The solution itself is creating A record pointing to the (their server), that will HTTP 301-redirect you to the (basing on the Host header, probably).

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Welcome to Server Fault - We prefer answers that can stand alone in the event their links go dead (see…) - Please consider updating your answer so that it will remain useful if the link goes dead. – voretaq7 Apr 4 '13 at 18:37
I've used wwwizer but it sets off paranoid bells for me for anything important. Handing half your visits off to a free third-party service... – ceejayoz Apr 4 '13 at 18:43
@ceejayoz, I agree. But, in this case, it is the only working solution I found. (Excepting, cron script that updates your A record on free dns service from time to time - that's really "unsafe" (some users may visit your domain while it's A information is not up-to-date) ). There're lots of such questions on OpehShift forums, but the only thing, they say is "yes, we don't have static IP addresses and that's a pity". – MInner Apr 4 '13 at 19:27

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