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From anton <way_...@yahoo.com>
Subject Re: [users@httpd] Help: how to configure multiple apache servers behind a hardware load balancer
Date Thu, 08 Mar 2007 20:12:14 GMT
Thanks, Matt.  I'll try the packet sniffer next. 
Meanwhile, I narrowed the problem down to virtual
hosts.  Here's the http.conf on each server:

...
ServerName mydomain.com:80
...
NameVirtualHost *:80
# redirect mydomain.com to www.mydomain.com
# has to match ServerName above
<VirtualHost *:80>
   Redirect permanent / http://www.mydomain.com/
   ServerName mydomain.com
</VirtualHost>
# provide webroot for the above redirect
<VirtualHost *:80>
   DocumentRoot /var/www/public_html
   ServerName www.mydomain.com
</VirtualHost>
# allow partner1.mydomain.com to work
<VirtualHost *:80>
   DocumentRoot /var/www/partner1
   ServerName partner1.mydomain.com
</VirtualHost>
... 

So, this makes 10% of the requests fail.  If I comment
out all of the virtual host stuff above, everything
works (but then, of course, I don't get canonical
hostname or partner1 to work).

Anton


--- matt farey <matt.farey@gmail.com> wrote:

> 
> anton wrote:
> > Thanks, Krist.  I thought that it should work in
> > theory too, but it doesn't in practice :( 
> Basically,
> > about 10% of requests to www.mydomain.com fail
> (time
> > out) if I set the servernames to www.mydomain.com
> for
> > both servers and then try to use VirtualHosts.  We
> > have to use virtualhosts because we need things
> like
> > partner1.mydomain.com and partner2.mydomain.com.
> >
> > I am not sure what to do at this point.
> >
> > Anton
> >
> > --- Krist van Besien <krist.vanbesien@gmail.com>
> > wrote:
> >
> >   
> >> On 3/8/07, anton <way_uhf@yahoo.com> wrote:
> >>     
> >>> Hi there,
> >>>
> >>> I'm a decently experienced apache user on ONE
> >>> webserver.  I'm trying to switch to two apache
> >>>       
> >> servers
> >>     
> >>> behind a Foundry hardware load balancer.
> >>>
> >>> I need a tutorial which would explain how to
> >>>       
> >> configure
> >>     
> >>> multiple apache servers behind a hardware load
> >>> balancer.
> >>>
> >>> I have a domain name correctly resolving to the
> >>> balancer's ip and the balancer correctly
> >>>       
> >> forwarding
> >>     
> >>> the requests to each server.  That's working
> fine.
> >>> Things get confusing when I try to configure
> each
> >>> server's ServerName and virtual hosts.
> >>>
> >>> Any help would be greatly appreciated.
> >>>       
> >> You just need to make sure each server has the
> >> server name that the
> >> client sees. So if you have
> >> www.mydomain.com
> >> and this resolves correctly to the loadbalancer
> than
> >> you just  need to have
> >> ServerName www.mydomain.com
> >> in your config on each server.
> >>
> >> In theory you could even run each webserver with
> the
> >> same httpd.conf.
> >>
> >> Krist
> >>
> >> -- 
> >> krist.vanbesien@gmail.com
> >> Bremgarten b. Bern, Switzerland
> >> --
> >> A: It reverses the normal flow of conversation.
> >> Q: What's wrong with top-posting?
> >> A: Top-posting.
> >> Q: What's the biggest scourge on plain text email
> >> discussions?
> >>
> >>
> >>     
> >
>
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> >   
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> >> Apache HTTP Server Project.
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> for
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> >>
> >>
> >>     
> >
> >
> >
>
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> >
> >   
> this might sound silly, but since neither backend
> server needs DNS, do
> you have hostname lookups off, do you have all your
> vhosts of the form
> <vhost  ip:port>
> servername www.mydomain.com
> </vhost>
> rather than
> <vhost www.mydomain.com:port>
> servername www.mydomain.com
> </vhost>
> could this be a hosts or DNS issue, a throw over
> from when things
> referred to different NICs/IPs, have you tried a
> packet sniffer like
> wireshark - my answer to almost every apache
> debuggering session, and
> tried to see why those tcp requests aren't
> happening, or whether its a
> http issue?
> ignore me if I'm barking incoherently.
> matt
> 
> 
> 
>
---------------------------------------------------------------------
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> Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for
> more info.
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> users-help@httpd.apache.org
> 
> 


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