[LON-CAPA-admin] changes to my domain

[Robert F Gonzales]

Stuart,

Thanks for the reply!  We just started the first of our 2 summer sessions
here at Binghamton so I think I'll wait until this is over before we give it
a try.

Thanks,
Bob Gonzales
Binghamton University

-----Original Message-----
From: lon-capa-admin-admin at mail.lon-capa.org
[mailto:lon-capa-admin-admin at mail.lon-capa.org] On Behalf Of Stuart Raeburn
Sent: Thursday, May 26, 2011 4:23 PM
To: lon-capa-admin at mail.lon-capa.org
Subject: Re: [LON-CAPA-admin] changes to my domain

Hi,

>
> Actually, the LON-CAPA host tables remember the host name, not the
> IP address, so repurposing the host name is likely going to cause
> problems.
>

Switching hostnames can be done, although there will be a 24 hour
period before the host tables in memory on LON-CAPA servers in the
cluster all reflect these "DNS" changes. During that time the SUNY
Binghamton servers will be unable to connect to other servers in the
cluster, because of a mismatch between lonHostID and hostname. If
Binghamton LON-CAPA users can live with this potential disruption then
this switch can be done.

LON-CAPA servers reload their hostname look-ups when loncron runs at
5.10 am local time. To minimize disruption the switchover at
Binghamton should be coordinated with the LON-CAPA Academic Consortium
so the hostname changes can be pushed out to the Consortium's "DNS"
servers at the same time as they are switched over locally.

This type of hostname switch has been completed successfully in the
past at other domains, e.g., see:

http://mail.lon-capa.org/pipermail/lon-capa-cvs/Week-of-Mon-20080721/017117.html

The LON-CAPA lonHostIDs should *not* be changed, i.e., binghamtonl1
should remain the library server, binghamtona2 remain an access server
etc.

Stuart Raeburn
MSU LON-CAPA group


Quoting Gerd Kortemeyer <korte at lite.msu.edu>:

> Hi,
>
> Actually, the LON-CAPA host tables remember the host name, not the
> IP address, so repurposing the host name is likely going to cause
> problems.
>
> More later (we are actually in the middle of our conference).
>
> - Gerd.
>
> On May 20, 2011, at 1:19 PM, Robert F Gonzales wrote:
>
>> Hi,
>>
>> I’d like to add a lonBalancer machine to my domain.    When this
>> happens it would be nice to make the lonBalancer machine have the
>> name loncapa.chem.binghamton.edu.  Right now, that name is used by
>> my library server.    I thought that I’d keep the library server’s
>> ip address the same as it currently is and just change its name and
>>  then use the name on the lonBalancer machine.    Is this
>> reasonable?    Name changes on the DNS server are no problem since
>> I maintain that for the chemistry subnet.   Who do I notify at
>> loncapa of the address and name changes and additions?
>>
>> Thanks
>> Bob Gonzales
>> Chemistry Dept
>> Binghamton University
>>
>
>
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