[LON-CAPA-admin] Adding Access servers

[H. K. Ng]

Mark,

Do you know how your network staff enters the round-robin registration? If 
you could get that info, it would helpful to me. When I asked the folks 
here to do it - it works to some extend - it doesn't actually do a 
round-robin. It still takes the first entry almost every time. However, if 
that one is down or not available?, it goes to the next one.

Thanks,
-hk

At 04:19 PM 3/30/2005, you wrote:
>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
> > addresses.
>
>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
>names?
>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".
>
>
>Todd
>
> > > 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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