Skip to main content

domain name system - Dns - wildcard vs. cname subdomains

itemprop="text">

Alright I have to admit I'm confused
with how DNS works. I've always just added things until they worked, and now it's time
to learn how they work.



So one confusing thing
to me is that there's sort of two places I can have records. I have an account with
rackspace cloud servers. And then there's the place I registered the domain. But both
allow me to edit DNS records.




Should
I do everything at both places or is one better than the other or am I missing the
point?



Subdomains confuse me too. I'd like to be
able to just have a wildcard subdomain (I've done this in the past.) I just don't like
the idea of adding a cname record or A record every time I need a new
subdomain.



Then I read href="http://en.wikipedia.org/wiki/Wildcard_DNS_record" rel="nofollow
noreferrer">this and it
says:




The exact
rules for when a wild card will match are specified in RFC 1034, but the rules are
neither intuitive nor clearly specified. This has resulted in incompatible
implementations and unexpected results when they are
used.



class="post-text" itemprop="text">
class="normal">Answer





The first thing you need to do is determine who actually serves authoritative
answers for your domain name. A WHOIS lookup will tell you which DNS servers are the
ones where you should be making changes.



Once
that is determined, make the changes with the provider listed and get rid of everything
else to avoid any future confusion.



Regarding
wildcards vs. hostnames, do whatever you're comfortable with. In general, most DNS
implementations will look for a hostname that's been specifically defined (i.e. an
A record that directs to a specific IP address) and will fall
back to a wildcard if none is found. Personally, I prefer to define each of my records
individually. This way I know what I have and where it goes without any questions.
Wildcards can be great if you have 300 hostnames that all need to go to the same place
and they change all the time. If you only have a handful of hostnames and they don't
change often, I'd opt for setting them up
individually.



If you have a dozen hostnames that
all need to go to the same IP, you can define one of them as an
A record, and make the rest CNAME
aliases of the first one. This way, you only need to update that IP address
once.


Comments

Post a Comment

Popular posts from this blog

iLO 3 Firmware Update (HP Proliant DL380 G7)

The iLO web interface allows me to upload a .bin file ( Obtain the firmware image (.bin) file from the Online ROM Flash Component for HP Integrated Lights-Out. ) The iLO web interface redirects me to a page in the HP support website ( http://www.hp.com/go/iLO ) where I am supposed to find this .bin firmware, but no luck for me. The support website is a mess and very slow, badly categorized and generally unusable. Where can I find this .bin file? The only related link I am able to find asks me about my server operating system (what does this have to do with the iLO?!) and lets me download an .iso with no .bin file And also a related question: what is the latest iLO 3 version? (for Proliant DL380 G7, not sure if the iLO is tied to the server model)
Post a Comment
Read more

linux - Awstats - outputting stats for merged Access_logs only producing stats for one server's log

I've been attempting this for two weeks and I've accessed countless number of sites on this issue and it seems there is something I'm not getting here and I'm at a lost. I manged to figure out how to merge logs from two servers together. (Taking care to only merge the matching domains together) The logs from the first server span from 15 Dec 2012 to 8 April 2014 The logs from the second server span from 2 Mar 2014 to 9 April 2014 I was able to successfully merge them using the logresolvemerge.pl script simply enermerating each log and > out_putting_it_to_file Looking at the two logs from each server the format seems exactly the same. The problem I'm having is producing the stats page for the logs. The command I've boiled it down to is /usr/share/awstats/tools/awstats_buildstaticpages.pl -configdir=/home/User/Documents/conf/ -config=example.com awstatsprog=/usr/share/awstats/wwwroot/cgi-bin/awstats.pl dir=/home/User/Documents/parced -month=all -year=all...
Post a Comment
Read more

linux - How can I get my mediawiki to stop thinking I have cookies disabled?

I've searched half a day for how to resolve this issue, and can't figure it out. Shortly after I made my wiki a simple private wiki according to the instructions at Mediawiki's website, it started giving me this weird login error message: Wiki uses cookies to log in users. You have cookies disabled. Please enable them and try again. If I remove those private wiki settings, the error disappears, even if I try logging in. But I need it to be a private wiki for only my team. So what do I do? Here's what I've done so far. Just to be safe, after ever change, I try rebooting Apache using: sudo /etc/init.d/apache2 restart In my php.ini file, I have the following set: session.save_path = "/var/lib/php5" session.cookie_secure = secure session.cookie_path = /tmp session.cookie_domain = my server's internal URL (should I even set this? this field was blank before, but not commented out) session.referer_check = Off I ran the following to ensure that the fold...
Post a Comment
Read more