[LON-CAPA-admin] Reloading spare.tab

[Mark Lucas]

Great! Thanks!

Mark

On Thu, 2008-09-11 at 21:34 -0400, Stuart Raeburn wrote:
> Mark,
> 
> Yes it does.
> 
> spare.tab is read within the BEGIN block in lonnet.pm which results in  
> population of the %spareid hash (a global).
> 
> lonnet::spareserver() is the routine which makes use of %spareid to  
> determine which servers to try.  It tries any servers designated as  
> "primary" first, and identifies the one with the lowest load.  This is  
> the server it will return unless the lowest load is 100 or more, in  
> which case it will try the servers designated as "default", and  
> identify the server with the lowest load from that group.  That is the  
> server it will return unless the lowest load in the "default" group is  
> higher than the lowest load in the "primary" group.
> 
> lonnet:;spareserver() is called by lonlogin.pm -- to allow an  
> overloaded server to send users hoping to log-in to LON-CAPA via that  
> particular server to another  machine to host the user sessions), and  
> also by switchserver.pm -- to load balance after successful  
> authentication when:
> 
> PerlSetVar lonBalancer yes
> 
> appears in the Apache config files for the server.
> 
> As these operations rely on the contents of the global %spareid hash  
> for the particular Apache child, /etc/init.d/httpd reload is  
> sufficient as that reloads all of the Apache children.
> 
> Stuart Raeburn
> MSU LON-CAPA group
> 
> Quoting Mark Lucas <lucasm at ohio.edu>:
> 
> > Stuart,
> >
> > Does that really reload the spare table into the appropriate places? If
> > so, great!
> >
> > Mark
> > On Thu, 2008-09-11 at 09:34 -0400, Stuart Raeburn wrote:
> >> Mark,
> >>
> >> /etc/init.d/httpd reload is what I use.
> >>
> >> Stuart Raeburn
> >> MSU LON-CAPA group
> >>
> >> Quoting Mark Lucas <lucasm at ohio.edu>:
> >>
> >> > Hi,
> >> >
> >> > I'm playing around with my spare.tab for lonbalancer.
> >> >
> >> > What's the least intrusive way of handling the reload?
> >> >
> >> > Will /sbin/service loncontrol reload do this without interrupting
> >> > services?
> >> >
> >> > 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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> 
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