Re: FW: LoadBalancing with Apache ... help me !!!

On Tuesday, Jun 24, 2003, at 06:09 US/Eastern, Tascino Antonio wrote:
>  in this way, are we sure that one FE machine forwards the HTTP 
> requests only to BE/HTTP machines ?
> My doubts are that one FE/HTTP forwards HTTP requests to other FE 
> machines and so on...

Your doubts are well founded.  The suggested (removeSelf) approach will 
only work if you have a single front-end machine.

There is a sample DSO candidacy function distributed with mod_backhand 
called byHostname.so.  There are some samples of how to use it in the 
online course notes from the various ApacheCon presentations.

If you front-end machines are all named www#.exmaple.com and your 
backend machines are named worker#.example.com, you can use the rule:

Backhand byAge
BackhandFromSO libexec/byHostname.so byHostname backend
Backhand byBusyChildren

Or something to that effect.  Not that this isn't really that fast as 
it will perform an several regular expression matches for each request 
received.  The performance isn't horrible though -- I've used this in 
production  :-D

Likely what you want to do it write your own candidacy function in C 
that excludes exactly the machines you want to.  Use the byHostname.c 
as a guide.

> On Sun, May 25, 2003 at 09:28:21PM +0200, Tascino Antonio wrote:
> > Hi, 
> >  
> >  I have read that pdf,  but it is not me clear how i have to do the 
> httpd
> > configuration. 
> > I  configure MulitcatsStats whit my IP multicasts,  and then ... ?  
> > I want to deny that a web-server in FE forwards some HTTP requets to 
> another
> > web-server in FE, but must forward to web-server in BE. I don't 
> understand
> > which is the configuration to perform this. 
>
> Add "Backhand removeSelf" to the configuration, so that the FE server
> only forwards requests and does not serve them itsself.

-- 
Theo Schlossnagle
Principal Consultant
OmniTI Computer Consulting, Inc. -- http://www.omniti.com/
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