Hi, So the challenge is simple, in the WebSphere world, the plugin self auto-reloads, and therefore you have the option of having say balancing between 2 servers and changing the "weight" (amount of traffic) sent to that server to zero, so no new traffic goes to that server, but any existing sticky session traffic continues to go to that server.... This works great for deploying an application to one cluster, while keeping another identical instance running on the old version and then switching the customers over to to the new customer without an outage. With Tomcat, we are currently fronting with Apache 2, with mod_jk, I did some research and you *can* do sticky sessions with mod_jk and you can load balance, but you cannot dynamically reload the workers.properties. Soooo, we can use an Apache graceful restart, will this lose all previous sticky sessions? In other words, customers are on server A, we do a graceful Apache restart and server A has zero load in the balancer, server B has 100% load. Customer X was on server A (Tomcat session) and presses submit on his application form to server A, what will Apache (mod_jk) do? (Attempt to send it to server B?) So I found: http://tomcat.apache.org/connectors-doc/reference/apache.html and JkMountFile could be used to reload the JkMount information, I could use this to *change* the worker but what happens to the sticky sessions that were on the other server before I changed this config? Finally, I do have the option to go Apache 2.2 and mod_proxy (with mod_proxy_ajp and a balancer), in any of the scenarios can I achieve my goal? mod_proxy didn't appear to easily support dynamically reconfiguring load balancing, if someone knows how I can dynamically re-configure the load balancing that would be great. Apologies if this is in the wrong section of the forum, please point me in the right direction. Regards, Gareth -- View this message in context: http://www.nabble.com/Switching-load-between-two-Tomcat-servers-without-outage-WITH-sticky-sessions...is-it-possible--tp21884744p21884744.html Sent from the Apache HTTP Server - Users mailing list archive at Nabble.com. --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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