Greetings,
...
Quoting "Chris H." <[EMAIL PROTECTED]>:
Greetings all,
...
Quoting Doug Barton <[EMAIL PROTECTED]>:
Oliver Brandmueller wrote:
DNS round robin is not about redundancy, the only thing you could have
that way is a kind of load balancing (not the most sophisticated way,
though). Whenever one of the servers fails, around half of the requests
still goes there and then times out/gets conn refused or whatever the
problem is. Prioritizing is not easily possible. Probably it helps if
you add one of the IPs more often to the set, but I never tried that and
did not read the docs on this topic, so before breaking your zone first
read the specs, if this works!
Just replying to this bit first, in BIND it does not work to specify
the same IP address multiple times for the same hostname. The server
will collapse the duplicates into one unique entry when it reads the
zone. I am not aware of any other authoritative name server for which
this would work either.
While this /might/ hold true in some/certain situations. I /can/ say
after 3.5 yrs. of doing exactly this, that it does not collapse the
namespace into a single IP<-->name. Here is the excerpt from the zone
file(s) running a recent BIND version:
####################################################
# hostA.domain.tld.zone
hostA IN A XXX.XXX.XXX.XA
IN HINFO IBM-PC/AT UNICS/UNIX
IN MX 10 mx
IN MX 60 mx2
graphics IN A XXX.XXX.XXX.XA
nameA IN A XXX.XXX.XXX.XA
nameB IN A XXX.XXX.XXX.XA
...
www IN A XXX.XXX.XXX.XA
nameC IN CNAME nameB
etc...
# hostB.domain.tld.zone
hostB IN A XXX.XXX.XXX.XB
IN HINFO IBM-PC/AT UNICS/UNIX
IN MX 10 mx
IN MX 60 mx2
nameD IN A XXX.XXX.XXX.XB
graphics IN A XXX.XXX.XXX.XB
hostE IN A XXX.XXX.XXX.XB
etc...
#####################################################
Please note the RR (PTR) zone only lists RR's for
hostA and hostB. It is the responsibility of the hosts
own zones to delegate the hostnames for their own zones.
Both of these hosts are running Apache for the HTTPd
service, and both of them serve pages for graphics.domain.tld.
Now, on to your initial question...
Speaking of Apache; Apache has provided a solution for
the /exact/ situation you are enquiring about since v.1.2.
You will find it in the documentation that comes with the
installation. I will endevour to find it's whereabouts in
the doc's and provide a link. As I host those doc's. It
involves DNS and either the use of Perl, or http(s)d.conf
trickery. This, of course, all assumes that you are working
with Apache. :)
Best wishes,
Chris H.
O.K. Here's the link(s) I promised:
You will/should find these two links /extremely/ valuable:
http://hosting.1command.com/manual/misc/rewriteguide.html
These are the things dreams are made of. ;)
the link I indicated you'd find as a good solution is here:
http://hosting.1command.com/manual/misc/rewriteguide.html
Just scroll down to the topic:
*Load Balancing*
Best wishes,
Chris H.
P.S. you will/should also spend some time on a DNS/BIND
newsgroup. As the knowledge gained there is invaluable.
I spend quite alot of time there answering questions,
and it is probably a better place to ask questions of
this nature. Because this list really isn't designed
for this kind of topic.
FYI,
Doug
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