Plana, Richard schrieb:
Hi,
Thanks. Yes, if I can't share the session information between the
various instances of Tomcat, I'd rather make a session sticky to a node
in the load-balance pool.
So I tried giving a jvmRoute to each Tomcat instance. I'm a little
confused with the mod_proxy_balancer configuration, though. What I've
done so far is the following:
<Proxy balancer://mycluster>
BalancerMember ajp://appserver1:8009/myapp max=10 smax=6 ttl=30
ping=120 route=jvm1
BalancerMember ajp://appserver2:8009/myapp max=10 smax=6 ttl=30
ping=120 route=jvm2
</Proxy>
ProxyPass /myapp balancer://mycluster/
ProxyTimeout 60
From the browser client side, I can see the ".jvm[12]" being appended to
the JSESSIONID cookie, but it would still switch from one Tomcat to the
other, albeit less frequently.
What am I doing wrong?
So far, so good. You also need to tell mod_proxy_balancer, what the name
of the URL parameter resp. Cookie is, which carries the routing
information. I forgot about that (in mod_jk it is automatically the
right for Java App Servers, mod_proxy is more flexible and you need to
set it).
So add "stickysession=JSESSIONID|jsessionid" at the end of the ProxyPass
line. See also the mod_proxy docs page, look out for stcikysession.
HTH
Rainer
Richard Plana
-----Original Message-----
From: Rainer Jung [mailto:[EMAIL PROTECTED]
Sent: Friday, July 04, 2008 11:13 AM
To: Tomcat Users List
Subject: Re: mod_ajp and Load-Balancing Issue
Plana, Richard schrieb:
Hi,
I've two tomcat servers being proxied and load-balanced by httpd using
mod_ajp (using balancer:). However, it seems when the proxy switches
from one server to another, the user session gets lost.
Could people recommend a way to correct my setup for doing
load-balancing with this scenario?
Oddly enough, it seemed to have functioned well when using mod_jk.
If you don't want to replicate all sessions between your tomcat nodes,
then use stickyness in the load balancer. This means, once a session has
started for a user on some node, all further requests of the user
belonging to this session will be routed to the same node.
Give each Tomcat in server.xml a unique jvmRoute and then set the route
parameter to the value of the corresponding jvmRoute of the load
balancer member in your mod_proxy_balancer configuration. Look for route
in the mod_proxy documentation page.
Caution: the Tomcat instances need to have different jvmRoute values.
The principles in mod_jk are the same. At least you need to set the
jvmRoute. In mod_jk stickyness is the default, and the name of the
worker I the default route. So you might have been lucky to set your
jvmRoute to the worker names and that was sufficient in the mod_jk case.
Regards,
Rainer
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