[LON-CAPA-admin] LON-Balancer

[Lucas, Mark]

Thanks!

On Jan 9, 2015, at 11:19 AM, Stuart Raeburn <raeburn at msu.edu> wrote:

> Mark,
> 
>> Does one still need to make changes in the httpd loncapa config   
>> file? Does one set it
>> up totally through the web now?
> 
> The intention in 2.11 has been to support designation and  
> configuration of "lonBalancer" instances (i.e., LON-CAPA load balancer  
> servers) exclusively using the web, by accessing:
> 
> Main Menu -> Set domain configuration -> Display (Dedicated Load  
> Balancer(s) checked) with the domain coordinator role active.
> 
> See the help file:  
> https://loncapa.msu.edu/adm/help/Domain_Configuration_Load_Balancing.hlp
> 
> In the case where web configuration has yet to be used, but
> 
> lonBalancer yes
> 
> exists in an Apache config file, then the LON-CAPA instance will  
> continue to operate as a load balancer, but without the various 2.11  
> options for determining where particular groups of users are offloaded  
> to.
> 
> However, in reviewing the 2.11.0 code I found one situation where  
> "lonBalancer yes" in the Apache config was still consulted -- namely  
> when an institutionally authenticated user first creates a new  
> LON-CAPA account on a load balancer server.  I have just committed  
> createaccount.pm rev. 1.69 to the LON-CAPA CVS repository.  This new  
> version now fully eliminates the need for "lonBalancer yes" in an  
> Apache config file.  createaccount.pm rev. 1.69 will be part of 2.11.1
> 
> At this point you have two options with 2.11.0:
> 
> (a) Use the web GUI to configure load balancing, and also include  
> "lonBalancer yes" in an Apache config file to support the one  
> situation with self-creation of accounts discussed above.
> 
> or
> 
> (b) Use the web GUI to configure load balancing, and replace  
> createaccount.pm rev 1.68 (included in 2.11.0) with rev. 1.69 using:
> 
> wget -O /home/httpd/lib/perl/Apache/createaccount.pm  
> 'http://source.loncapa.org/cgi-bin/cvsweb.cgi/~checkout~/loncom/interface/createaccount.pm?rev=1.69;content-type=text/plain'
> 
> /etc/init.d/httpd reload
> 
> (Note: by doing this, you will cause the nightly module version check  
> to send an e-mail because of the discrepancy between the expected  
> (1.68) and installed (1.69) versions).
> 
> 
> Stuart Raeburn
> LON-CAPA Academic Consortium
> 
> Quoting "Lucas, Mark" <lucasm at ohio.edu>:
> 
>> What is the accepted practice for setting up a Balancing machine nowadays?
>> I moved my balancer to a different machine last Fall when I bumped   
>> up to 2.11.0
>> and it did not seem to be working right. It seemed to be keeping   
>> some sessions on the
>> balancer itself and did not seem to be transferring sessions to the   
>> main access servers
>> as consistently as it should. I pointed to one of the standard   
>> access servers and left it at that.
>> 
>> I know that there is now extra configuration information in the   
>> domain coordinator's online
>> settings for the domain. What is the accepted way to set up a brand   
>> new LON Balancer?
>> Does one still need to make changes in the httpd loncapa config   
>> file? Does one set it
>> up totally through the web now?
>> 
>> Thanks!
>> Mark
>> 
>> --
>> Mark Lucas 								email: lucasm at ohiou.edu
>> 252D Clippinger Lab						phone: (740)597-2984
>> Department of Physics and Astronomy		fax: (740)593-0433
>> Ohio University
>> Athens, OH 45701
>> 
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>> 
> 
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-- 
Mark Lucas 								email: lucasm at ohiou.edu
252D Clippinger Lab						phone: (740)597-2984
Department of Physics and Astronomy		fax: (740)593-0433
Ohio University
Athens, OH 45701