[users@httpd] mod_proxy -> random routing change

[Vladimir Dvorak <vl...@vdsoft.org>]

Hi guys,

after weeks of investigation I have to ask you for help.

Problem Description:
The problem is that application is randomly (really non 
deterministically) logging users out - they are working with 
application, but suddenly (not all at one time) the user is logged out 
(because mod_proxy is probably start routing the user to second Tomcat 
server). We are using sticky sessions. Loadbalancer is running Apache + 
mod_proxy. There are two servers in the backend running Tomcats.

Schematically:
client -> https at loadbalancer (Apache, mod_proxy) -> {tomcat server1, 
tomcat server2}

Loadbalancer setting (apache.conf):
--snip--
     ProxyRequests Off
     ProxyStatus On
     <Proxy *>
         Order deny,allow
         Allow from all
     </Proxy>
     RewriteEngine on
     RewriteRule ^/$ /portal/ [R]
     ProxyErrorOverride On
     ProxyPass /portal/ balancer://productive/portal/ 
stickysession=ESPROUTEID nofailover=Off timeout=180
    <Proxy balancer://productive>
         BalancerMember ajp://1.1.1.1:8009 keepalive=On route=1 
loadfactor=50 lbset=0 retry=30
         BalancerMember ajp://1.1.1.2:8009 keepalive=On route=2 
loadfactor=50 lbset=0 retry=30
     </Proxy>
--snip--

Loadbalancer's Apache compile options:
   $ ./configure --prefix=/var/GridFrame/usr/local/apache-2.2.21 
--enable-proxy --enable-rewrite --enable-ssl --enable-vhost-alias 
--with-mpm=worker --disable-cgi --disable-cgid --enable-proxy-http 
--enable-proxy-ajp --enable-proxy-connect --enable-proxy-balancer 
--enable-headers



Do you please have any hints/advice so users are not suddenly routed to 
different Tomcat? Network between loadbalancer and Tomcats is stable.


Thank you a lot,

Vladimir




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Re: [users@httpd] mod_proxy -> random routing change

[Igor Cicimov <ic...@gmail.com>]

http://httpd.apache.org/docs/2.2/mod/mod_proxy_balancer.html#stickyness_implementation


On Mon, Jan 16, 2012 at 8:31 PM, Vladimir Dvorak <vladimir.dvorak@vdsoft.org
> wrote:

> Hi guys,
>
> after weeks of investigation I have to ask you for help.
>
> Problem Description:
> The problem is that application is randomly (really non deterministically)
> logging users out - they are working with application, but suddenly (not
> all at one time) the user is logged out (because mod_proxy is probably
> start routing the user to second Tomcat server). We are using sticky
> sessions. Loadbalancer is running Apache + mod_proxy. There are two servers
> in the backend running Tomcats.
>
> Schematically:
> client -> https at loadbalancer (Apache, mod_proxy) -> {tomcat server1,
> tomcat server2}
>
> Loadbalancer setting (apache.conf):
> --snip--
>    ProxyRequests Off
>    ProxyStatus On
>    <Proxy *>
>        Order deny,allow
>        Allow from all
>    </Proxy>
>    RewriteEngine on
>    RewriteRule ^/$ /portal/ [R]
>    ProxyErrorOverride On
>    ProxyPass /portal/ balancer://productive/portal/
> stickysession=ESPROUTEID nofailover=Off timeout=180
>   <Proxy balancer://productive>
>        BalancerMember ajp://1.1.1.1:8009 keepalive=On route=1
> loadfactor=50 lbset=0 retry=30
>        BalancerMember ajp://1.1.1.2:8009 keepalive=On route=2
> loadfactor=50 lbset=0 retry=30
>    </Proxy>
> --snip--
>
> Loadbalancer's Apache compile options:
>  $ ./configure --prefix=/var/GridFrame/usr/**local/apache-2.2.21
> --enable-proxy --enable-rewrite --enable-ssl --enable-vhost-alias
> --with-mpm=worker --disable-cgi --disable-cgid --enable-proxy-http
> --enable-proxy-ajp --enable-proxy-connect --enable-proxy-balancer
> --enable-headers
>
>
>
> Do you please have any hints/advice so users are not suddenly routed to
> different Tomcat? Network between loadbalancer and Tomcats is stable.
>
>
> Thank you a lot,
>
> Vladimir
>
>
>
>
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