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Subject: Re: [users@httpd] 2nd try: Load balancing Apache on both HTTP and
 HTTPS
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Nes Yarug wrote:
> Hi all,
> 
> 2nd try to see if anyone can shed some light on my configuration.
> 
> I've been trying to configure Apache's balancer proxy, but have not had any
> luck. I've been trying to configure a load balancing proxy that forwards
> requests to 2 web servers. I want both http and https requests to be
> forwarded. (Actually, the forwarded requests do not need to be https as
> they are routed over the LAN)
> 
> A simple picture of what I want:
> 
> Internet HTTP/HTTPS-->
> 
> --------------------------------------
> | Box 1: (Apache) Load balancer | -->
> --------------------------------------
> --------------------------
> | Box 2: Web server 1 |
> --------------------------
> --------------------------
> | Box 3: Web server 2 |
> --------------------------
> 
> I started with the following configuration in /etc/apache/httpd.conf:
> 
> ProxyPass /awstats !
> ProxyPass /balancer-manager !
> ProxyPass / balancer://mycluster/ stickysession=jsessionid
> ProxyPreserveHost On
> 
> <Proxy balancer://mycluster/> <balancer://mycluster/%3E>
> BalancerMember http://192.168.0.2:80 <http://192.168.0.2/>
> BalancerMember http://192.168.0.3:80 <http://192.168.0.3/>
> </Proxy>
> 
> This worked fine, but ofcourse not for https requests. I then removed the
> above configuration from httpd.conf and placed it in the default vhost
> configuration at /etc/apache2/vhosts.d/00_default_vhost.conf:
> 
> ProxyPass /awstats !
> ProxyPass /balancer-manager !
> ProxyPass / balancer://mycluster/ stickysession=jsessionid
> ProxyPreserveHost On
> 
> <Proxy balancer://mycluster/> <balancer://mycluster/%3E>
> BalancerMember http://192.168.0.2:80 <http://192.168.0.2/>
> BalancerMember http://192.168.0.3:80 <http://192.168.0.3/>
> </Proxy>
> 
> I then configured the default ssl virtual host simularly
> (/etc/apache2/modules.d/41_mod_ssl.default-vhost.conf):
> 
> ProxyPass / balancer://mysslcluster/ stickysession=jsessionid
> ProxyPreserveHost On
> 
> <Proxy balancer://mysslcluster/> <balancer://mysslcluster/%3E>
> BalancerMember https://192.168.0.2:443 <https://192.168.0.2/>
> BalancerMember https://192.168.0.3:443 <https://192.168.0.3/>
> </Proxy>
> 
> But now I cannot get my requests to the balancer handled by one of the web
> servers (i.e. the request is not forwarded). An http request is
> forwarded to
> the web servers, but an https request is giving an Internal Server Error.
> 
> https requests seem never been forwarded to the balancer members. I can
> see the request coming in on the load balancer, but no requests are
> logged by any of the two balancer members. As for http requests I can
> see the requests coming in on the load balancer and then in the logs of
> one of the two balancer members.
> 
> Can someone please comment on the above configuration and tell me what I'm
> doing wrong?

comment: stickysession isn't doing anything unless you're running
another application or server which manages sessions (e.g. Tomcat).

what you're doing wrong: do you have SSL  running on those two servers,
and can you create a normal request directly to them and does that give
you a 500 too?

What is the cause of the 500 in the error_log of the proxied servers?

> Many thanks,
> Nes

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