On Friday 23 April 2021 at 18:01:58, paul.leo@xxxxxxxxxxxxxxxxx wrote:
> Quick question re: DNS. Can CNAMEs be used, or can they only be A records?
> (Assuming each sub-domain is on same IP address as domain.
You can use CNAMEs.
Just bear in mind that if you do use a CNAME for a hostname, you cannot have
anything else (including another CNAME) for that hostname.
So, if you want a hostname to resolve to one IP address and not have any MX
records etc, a CNAME is fine.
If the hostname needs to resolve to more than one IP address, or resolve to an
address and also have an MX record, or similar, then you cannot use a CNAME.
Antony.
> -----Original Message-----
> From: Richard <lists-apache@xxxxxxxxxxxxxxxxxxxxx>
> Sent: Thursday, April 22, 2021 6:51 PM
> To: users@xxxxxxxxxxxxxxxx
> Subject: Re: Logging issue
>
> > Date: Thursday, April 22, 2021 20:24:02 -0400
> > From: H <agents@xxxxxxxxxxxxxx>
> >
> > On 04/22/2021 06:02 PM, Richard wrote:
> >>> Date: Thursday, April 22, 2021 16:53:56 -0400
> >>> From: H <agents@xxxxxxxxxxxxxx>
> >>>
> >>> I read on one webpage that the locations (ie app1, app2 etc) have to
> >>> have their own A records. Does that mean that I need to have
> >>> app1.mydomain.com, app2.mydomain.com etc. registered individually
> >>> with my domain registrar for each of them to get its own A record?
> >>
> >> Yes, the sub-domains need A-records, that is done through the DNS
> >> records you set up for the domain. Only the *domain* (e.g.,
> >> example.com) is registered with the registrar.
> >
> > Great, thank you. I just did that and another piece of knowledge fell
> > into place... :-) I will let it propagate overnight and look at it
> > again tomorrow.
>
> DNS is a query and cache system, records don't "propagate". If done
> properly, once you have entered a record and the zone has been loaded a
> query should result in an accurate answer. "Properly" includes bringing
> down the TTL if you are changing details on an existing record, and of
> course updating the serial so that secondaries know to update.
--
It is also possible that putting the birds in a laboratory setting
inadvertently renders them relatively incompetent.
- Daniel C Dennett
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