[LON-CAPA-admin] access server questions

Bob Gonzales rgonzal at binghamton.edu
Tue Oct 14 15:18:29 EDT 2008

lon-capa-admin at mail.lon-capa.org

I made the changes outlined below, renaming my access server to
what was entered in the loncapa DNS tables, and I was able to 
see remote resources in one of my homework sets from my access 
server.  I only checked that one.

Today, I went to check some other homework sets and I cannot see
any of those remote resources (I get a message "Unable to Find...).  
I can still see the resources in the original set that I checked
last week.

On my library server I can see all the remote resources in all of
my sets and I can browse to them via "Edit Course->Import".

What can I check to help track down the problem?

Bob Gonzales
Binghamton University
Chemistry Dept

-----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: Saturday, October 04, 2008 5:14 PM
To: lon-capa-admin at mail.lon-capa.org
Subject: Re: [LON-CAPA-admin] access server questions


Although the LON-CAPA cluster tables have been updated on the LON-CAPA  
"DNS" servers run by the LON-CAPA Academic Consortium, connections  
between your new server and other servers in the LON-CAPA network and  
are failing because there is a mismatch between the lonHostID used by  
your new server, and the lonHostID included in the record added to the  
hosts table on 9/26.  This is the current entry in the dns_hosts.tab  


The login page for your new server reports:
Domain:    	 binghamton
Server:  	 binghamtona1 (access)

The simplest thing would be for you to modify the lonHostID in:

and the last line in /home/httpd/lonTabs/hosts.tab
on loncapa2.chem.binghamton.edu

so the new server is known as binghamtona2 everywhere.

If you also added an entry for the access server to  
/home/httpd/lonTabs/hosts.tab on your library server  
so the two servers could communicate with each other before the  
central dns_hosts tables had been updated you should modify that too.   
If you hadn't added a line to hosts.tab on your library server you can  
ignore this last part.

You'll need to use:

/etc/init.d/loncontrol restart
/etc/init.d/httpd restart

on your access server after you've made the change.

The alternative to this would be to leave the entries on your own  
server(s) unchanged, and have the entry in the central DNS cluster  
tables changed to:
binghamtona1:binghamton:access:loncapa2.chem.binghamton.edu.  However,  
this will likely involve a greater delay because your server would  
only be able to connect to the network once the updated dns_hosts.tab  
file had been propagated to the LON-CAPA "DNS" servers at MSU, UIUC  
and SFU.

I checked ports 80, 8080 and 5663 for inbound TCP/IP traffic to your  
new acces server.  All looks good.

loncapa2.chem.binghamton.edu (
5663/tcp open  unknown
8080/tcp open  http-proxy
80/tcp open  http

Stuart Raeburn

Quoting Bob Gonzales <rgonzal at binghamton.edu>:

> I've got a new access server in the domain.  I've
> been told it is in the cluster tables but it will
> take a while to propagate around.  It's been a week
> now.  How long does this usually take?
> When I log directly into the access server as a
> course coordinator and go to edit contents
> and go to import, I can see all of the domains but
> clicking on a domain doesn't show me any resources,
> it just turns the little arrow to point down without
> showing anything from that domain.
> Likewise, if I log directly into the access  server as
> a student I can't see any of the resourses that are not
> in my domain.  For a composite page, wherever there is a
> non-local resource I have the title of the resource displayed
> and the words "Not available" displayed above it.
> My computer center has opened the 5663 and 80 for the
> IP of the access server,, but if someone
> would like to confirm that the ports are open for me that
> might be helpful.
> Any other help would be appreciated, even if you just
> tell me to be patient.
> Bob Gonzales
> Binghamton University
> Chemistry Dept
> _______________________________________________
> LON-CAPA-admin mailing list
> LON-CAPA-admin at mail.lon-capa.org
> http://mail.lon-capa.org/mailman/listinfo/lon-capa-admin

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