I feel I must apologise. Upon closer examination, it appears I am having the
same problem with my Linux load-balancer as well. It looks like I may a
"compound" issue. The initial confusion started with the different way that
Linux and Windows Apache servers handle the "trailing slash" for a URL. The
Windows Apache would not see the trailing slash and break, so I was able to
notice the problem. The Linux Apache server would not see the trailing slash,
but would gracefully work around it. The other issue may also be connected to
the trailing slash issue but I'm not sure, I'll try to explain it as best I can.
When I go to http://192.168.1.100/examples (no trailing slash), I actually
get forwarded to a Tomcat server and end up at
http://192.168.1.110:8080/examples . If this happens, the "Session ID" stays
the same and all my name/value pairs accumulate in the "session" example.
However, If I keep adding a trailing slash:
http://192.168.1.100/examples/
http://192.168.1.100/examples/servlets/
etc.
Then the URL in the address bar stays that of the load-balancer, BUT, every
time I add a new name/value pair to the "session" example I get a new "Session
ID" and my name/value pairs keep getting overwritten.
This, of course, wont work because there is now no more load balancing or
failover protection.
So ... I am now not sure if this is a "trailing slash" issue or a "sessions"
issue, both or neither. If I use a static page placed in:
C:\Program Files\Apache Software Foundation\Tomcat
6.0\webapps\examples\test.html
the load-balancing and failover work perfectly. It appears to only break if
there is some kind of session/dynamic content on the page.
So what does everybody think? Is this a simple issue or more complex? Is this
simply a "URL Rewrite" issue or something else?
Thank you so much for reading and replying.
________________________________________
From: Alston, Brian (US SSA) [brian.als...@baesystems.com]
Sent: Thursday, March 19, 2009 3:32 PM
To: Tomcat Users List
Subject: RE: Need Help With Clustered Tomcat Sessions
Yes I am.
The frustrating thing is I have 2 Tomcat servers and 2 Apache load
balancers. One load balancer is Linux and one load balancer is Windows Server
2003 (I never have them both on at the same time). I can turn off my Windows
load balancer, turn on my Linux load balancer, and the sessions work perfectly.
It is some kind of issue with the Windows load balancer but I just cannot
figure it out. My Apache load balancing configurations are the same between the
Linux and Windows servers; the only difference is that the Linux load balancer
works and the Windows one does not work, so you can see why I want to pull my
hair out. I would simply stick with the Linux load balancer but they want me to
use the Windows one, so I'm stuck.
________________________________________
From: Jorge Medina [jmed...@e-dialog.com]
Sent: Thursday, March 19, 2009 3:13 PM
To: Tomcat Users List
Subject: RE: Need Help With Clustered Tomcat Sessions
Are you maintaining session stickyness?
Did you configure Tomcat to replicate the sessions?
-----Original Message-----
From: Alston, Brian (US SSA) [mailto:brian.als...@baesystems.com]
Sent: Thursday, March 19, 2009 1:40 PM
To: users@tomcat.apache.org
Subject: Need Help With Clustered Tomcat Sessions
Hello All
I am having trouble with my Tomcat cluster that I hope you can help
with. First my setup:
Apache Load Balancer: Windows Server 2003 - Apache 2.2.11 -
192.168.1.100
Tomcat Server 1: Windows Server 2003 - Tomcat 6.0.18 - 192.168.1.110
Tomcat Server 2: Windows Server 2003 - Tomcat 6.0.18 - 192.168.1.120
When I go to the Apache load balancer (http://192.168.1.100) the page
comes up fine. When I go to the Java examples
(http://192.168.1.100/examples/) and click on "Servlets Examples" and
then on "Sessions -> Execute" the page also comes up fine. It is here
when I start to have problems.
First, let me explain how I know I have problems. Here is another
setup I have:
Apache Load Balancer: RedHat Enterprise Linux 5 - Apache 2.2.3 -
192.168.2.100
Tomcat Server 1: Windows Server 2003 - Tomcat 6.0.18 - 192.168.2.110
Tomcat Server 2: Windows Server 2003 - Tomcat 6.0.18 - 192.168.2.120
When I go to my Linux load-balanced cluster and enter "Name/Value
Session Attributes" into the "Sessions" Servlet Examples, they
accumulate and I maintain the exact same "Session ID". For example:
Session ID: CCAE9F2E90A5311166E7B67CE003A727.tomcat1
The following data is in your session:
color-sky = blue
color-grass = green
color-firetruck = red
color-cloud = white
No matter what I enter, I get an additional "Name/Value Session
Attribute" pair and the exact same "Session ID".
Now, back to my Windows Server 2003 load-balanced cluster. Whenever I
enter any "Name/Value Session Attribute" pairs, the new name/value pair
always replaces the old, and I end up with an entirely new "Session ID"
to boot:
Session ID: xxxxXXXXxxxxXXXXxxxxXXXXxxxxXXXX.tomcat1
Session ID: xxxxXXXXxxxxXXXXxxxxXXXXxxxxXXXX.tomcat2
Session ID: xxxxXXXXxxxxXXXXxxxxXXXXxxxxXXXX.tomcat1
Session ID: xxxxXXXXxxxxXXXXxxxxXXXXxxxxXXXX.tomcat2
Session ID: xxxxXXXXxxxxXXXXxxxxXXXXxxxxXXXX.tomcat1
Session ID: xxxxXXXXxxxxXXXXxxxxXXXXxxxxXXXX.tomcat1
.
.
.
I am hoping that there is a simple fix for this because I have no clue.
My Apache httpd.conf file and Tomcat server.xml files are exactly the
same between the Linux load-balanced cluster and the Windows Server 2003
load-balanced cluster, so I assume that cannot be the cause.
Any help will be greatly appreciated. Thanks for reading and have a good
day.
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