Re: JvmRoute must be unique?
Il 18/11/2011 16:09, Christopher Schultz ha scritto: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 a. on node01, jvmroute=istance01_node01 and instance02_node01 for instance01 and istance02, respectively; b. on node01, jvmroute=istance01_node02 and instance02_node02 for instance01 and istance02, respectively. I see a lot of typos istance instead of instance. Are you sure you have everything spelled correctly in your configuration? Yes, instances reported here were just for an example. istance were a missplelled... So my Apache configuration for stickysession is as follow: - ProxyPass /myApp/ balancer://balance-this/myApp/ Proxy balancer://balance-this BalancerMember ajp://node01:10505 route=instance01_node01 BalancerMember ajp://node01:10505 route=instance02_node01 BalancerMember ajp://node02:10505 route=instance01_node02 BalancerMember ajp://node02:10505 route=instance02_node02 ProxySet stickysession=JSESSIONID nofailover=On/Proxy - And this works fine! Good. BUT, if I have jvmroute parameter configured with the same value for all my tomcat instance (e.g. jvmroute=myRoute) and so apache configured as follow [...] it still works!!! I do not lose my session! Why??? Have to jvmroute be unique or not??? That's probably because you are only being directed to a single Tomcat backend. mod_proxy_ajp probably picks the first worker that matches the jvmRoute and it doesn't care that they are all the same. If you run a load test against the cluster, I suspect that you'll end up with 100% of the load going to a single Tomcat backend. Exactly, I ran more load test and all end up on the first tomcat instance Thanks for the reply. Francesco. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk7GdREACgkQ9CaO5/Lv0PBALQCeO3zJLwIYGo9E9zxkCPlt52ld QwMAn2O4DKFQqtflvsWZPoa4XnLybJsO =7T22 -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- -- Francesco Sordillo CINECA - System and Technologies Department e-mail: f.sordi...@cineca.it phone: (0039) 051 6171 874 - CINECA - Inter University Computing Center via Magnanelli 6/3 Casalecchio di Reno - 40033 - (BO) www.cineca.it - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
JvmRoute must be unique?
Hi to all. I'm using Tomcat 6.0.26 on RHEL 5.6 machine and Apache 2.2.3. I don't understand if the jvmroute for stickysession must be unique! My scenario is this: - two machine - two tomcat instance per machine - proxy balancer on apache actived and connected with tomcat in full mesh So I have: - node01, node02 (the machines) - istance01, instance02 on node01 and node02 Tomcat instances are not configured for Cluster/Session Replication. On each tomcat instance I setted jvmroute parameter as follow: a. on node01, jvmroute=istance01_node01 and instance02_node01 for instance01 and istance02, respectively; b. on node01, jvmroute=istance01_node02 and instance02_node02 for instance01 and istance02, respectively. So my Apache configuration for stickysession is as follow: - ProxyPass /myApp/ balancer://balance-this/myApp/ Proxy balancer://balance-this BalancerMember ajp://node01:10505 route=instance01_node01 BalancerMember ajp://node01:10505 route=instance02_node01 BalancerMember ajp://node02:10505 route=instance01_node02 BalancerMember ajp://node02:10505 route=instance02_node02 ProxySet stickysession=JSESSIONID nofailover=On /Proxy - And this works fine! BUT, if I have jvmroute parameter configured with the same value for all my tomcat instance (e.g. jvmroute=myRoute) and so apache configured as follow - ProxyPass /myApp/ balancer://balance-this/myApp/ Proxy balancer://balance-this BalancerMember ajp://node01:10505 route=myRoute BalancerMember ajp://node01:10505 route=myRoute BalancerMember ajp://node02:10505 route=myRoute BalancerMember ajp://node02:10505 route=myRoute ProxySet stickysession=JSESSIONID nofailover=On /Proxy - it still works!!! I do not lose my session! Why??? Have to jvmroute be unique or not??? Remember, I don't use cluster/session replication feature Thanks. Francesco. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: JvmRoute must be unique?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Francesco, On 11/18/11 5:29 AM, Francesco Sordillo wrote: I'm using Tomcat 6.0.26 on RHEL 5.6 machine and Apache 2.2.3. I don't understand if the jvmroute for stickysession must be unique! jvmroute must be unique. It's pretty clear from the documentation both here: http://tomcat.apache.org/connectors-doc/reference/workers.html If you want to use session stickiness, you must set different jvmRoute attributes in the Engine element in Tomcat's server.xml. Furthermore the names of the workers which are managed by the balancer have to be equal to the jvmRoute of the Tomcat instance they connect with. and here: http://tomcat.apache.org/tomcat-7.0-doc/config/engine.html jvmRoute - Identifier which must be used in load balancing scenarios to enable session affinity. The identifier, which must be unique across all Tomcat servers which participate in the cluster, will be appended to the generated session identifier, therefore allowing the front end proxy to always forward a particular session to the same Tomcat instance. Is there something that should be added to the documentation to make this more clear? My scenario is this: - two machine - two tomcat instance per machine - proxy balancer on apache actived and connected with tomcat in full mesh So I have: - node01, node02 (the machines) - istance01, instance02 on node01 and node02 Tomcat instances are not configured for Cluster/Session Replication. On each tomcat instance I setted jvmroute parameter as follow: a. on node01, jvmroute=istance01_node01 and instance02_node01 for instance01 and istance02, respectively; b. on node01, jvmroute=istance01_node02 and instance02_node02 for instance01 and istance02, respectively. I see a lot of typos istance instead of instance. Are you sure you have everything spelled correctly in your configuration? So my Apache configuration for stickysession is as follow: - ProxyPass /myApp/ balancer://balance-this/myApp/ Proxy balancer://balance-this BalancerMember ajp://node01:10505 route=instance01_node01 BalancerMember ajp://node01:10505 route=instance02_node01 BalancerMember ajp://node02:10505 route=instance01_node02 BalancerMember ajp://node02:10505 route=instance02_node02 ProxySet stickysession=JSESSIONID nofailover=On /Proxy - And this works fine! Good. BUT, if I have jvmroute parameter configured with the same value for all my tomcat instance (e.g. jvmroute=myRoute) and so apache configured as follow [...] it still works!!! I do not lose my session! Why??? Have to jvmroute be unique or not??? That's probably because you are only being directed to a single Tomcat backend. mod_proxy_ajp probably picks the first worker that matches the jvmRoute and it doesn't care that they are all the same. If you run a load test against the cluster, I suspect that you'll end up with 100% of the load going to a single Tomcat backend. Remember, I don't use cluster/session replication feature Good. :) - -chris -BEGIN PGP SIGNATURE- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk7GdREACgkQ9CaO5/Lv0PBALQCeO3zJLwIYGo9E9zxkCPlt52ld QwMAn2O4DKFQqtflvsWZPoa4XnLybJsO =7T22 -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
