Re: Need Help With Clustered Tomcat Sessions
Christopher Schultz wrote: Get yourself an HTTP sniffer to verify that this is what is happening: Maybe easier in this case, a simple browser add-on : Firefox : LiveHttpHeaders or HttpFox IE : Fiddler They allow you to see what the browser sends to the server, and what the server returns, including redirects, cookies, etc.. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Need Help With Clustered Tomcat Sessions
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
Re: Need Help With Clustered Tomcat Sessions
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Brian, On 3/20/2009 10:21 AM, Alston, Brian (US SSA) wrote: 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[, 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 is very good information. Nice investigation, especially because it leads directly to a conclusion: Your JSESSIONID cookies have the wrong information in them. Get yourself an HTTP sniffer to verify that this is what is happening: 1. You make a connection to http://192.168.1.100/examples/ 2. The request is re-routed to http://192.168.1.110:8080/examples/ 3. The server responds with a Set-Cookie header including host=192.168.1.110 4. Your next request goes to http://192.168.1.100/examples/, so the browser never sends the JSESSIONID cookie back to the server You need to make sure that the URL the client sees matches the hostname used in the Set-Cookie header. When you leave-off the trailing /, the server sends a REDIRECT back to the client and says go to http://192.168.1.110:8080/examples/;, and then everything works fine (because the hostname changes as far as the client is concerned). How do you have Apache talking to Tomcat? Are you using mod_proxy_http? mod_proxy_ajp? mod_jk? So what does everybody think? Is this a simple issue or more complex? Is this simply a URL Rewrite issue or something else? It's more likely that you are using mod_proxy_http, and you haven't properly configured a ProxyPassReverse for your servers. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAknD/e4ACgkQ9CaO5/Lv0PDXMwCgiq0k00vwDRPtGuACUbHuOfEE lvMAnAyE59SYdniJ77KU0sUILaSgKthn =jiRr -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
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: .tomcat1 Session ID: .tomcat2 Session ID: .tomcat1 Session ID: .tomcat2 Session ID: .tomcat1 Session ID: .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. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
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: .tomcat1 Session ID: .tomcat2 Session ID: .tomcat1 Session ID: .tomcat2 Session ID: .tomcat1 Session ID: .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. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
