[LON-CAPA-admin] Adding Access servers
truskell at mines.edu
Wed Mar 30 16:19:51 EST 2005
Mark (and likely Guy),
Thanks for the solution below. I took Mark's implementation to our network
folks, and got this positive response with a caveat:
> We can and will support the round-robin scheme for resolving IP
> addresses. I should say I've never done it, so I'm not sure exactly
> what all the possible gotchas are, but it's pretty standard practice and
> should work.
> We can't however accomplish this the way you describe. The feature
> (actually it was considered a bug) that allowed an alias to point to
> multiple systems ad described in the quote you sent was removed/fixed in
> recent version of BIND.
> The approved method of achieving the same result is to have multiple
> hosts that actually have the same hostname. That is we could have two
> hosts defined with the name "loncapa.mines.edu", each with different IP
So this brings me to questions probably for Guy:
The hosts.tab file contains hostnames, LON-CAPA names, and IP addresses.
1) Will LON-CAPA choke if two IP addresses have the hostnames?
2) Should we then give our access servers the same, or different, LON-CAPA
3) Or is there some other way to manifest the load-balancing that I should
point our network folks to?
Thanks for your help. I'm learning more about the inner workings of
load-balancing than I ever thought I would, but that's a "good thing".
> > We have defined an alias, loncapa.phy.ohiou.edu, that has two references
> > in the Domain Name server. DNS hands out the name in a round-robin
> > fashion. This does a pretty good job of evening the load. Once the student
> > is logged into a particular server, they stay on that server.
Dr. Todd Ruskell
Lecturer, Department of Physics Office: Meyer Hall 326
Colorado School of Mines Phone: 303-384-2080
1523 Illinois Street Fax: 303-273-3919
Golden, CO 80401
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