(1) Install TC as many times as you need JVM instances; (2) for each instance, rename home before proceeding with another installation eg. CATALINA_HOME_tc1=/path/to/tc1 CATALINA_HOME_tc2=/path/to/tc2 etc (3) for each inctance rename respective startup scripts eg startup_tc1.sh or catalina_tc1.sh startup_tc2.sh etc (4) modify workers.properties to include the loadbalancer worker eg worker.loadbalancer.type=lb worker.loadbalancer.balanced_worker=myTC1, myTC2, myTC3,... etc (5) go through your configuratioo fles to ensure consisency in re-naming worker to "loadbalancer" (6) should you need to tie a vhost to a specific JVM or box then instead of "loadbalancer", use a worker eg "myTC1" eg. (httpd.conf) <VirtualHost 192.16.100.10:80> ServerName dodgy.programmer.com.hk ... JkMount /goodClass loadbalancer JkMount /goodClass/* loadbalancer JkMount /dodgyClass myTC1 JkMount /DodgyClass/* myTC1 </VirtualHost> (7) In server.xml, ensure you have the corresponding virtual host and docbase (8) In web.xml, likewise ensure you have the corresponding mappings.
Yoav, John, tomcat-people, if this is correct, do you need someone to write a "howto" ? "Pitre, Russell" wrote: > > Hey people...... > > Where can i find more information on the web about this subject, > specifically setting up multiple jvm's tied to it's respective tomcat > installation? Doesn't have to include multiple processors.... > > I'm very interested in this subject, basically, just curious as to how > it all works :) > > Thanx in advance! > Russ > > -----Original Message----- > From: John Turner [mailto:[EMAIL PROTECTED] > Sent: Thursday, September 04, 2003 4:16 PM > To: Tomcat Users List > Subject: Re: Tomcat and multiple processors > > Matt Raible wrote: > > > 1. Does it support multiple processors? We have a Tomcat instance in > > > production on a NT box with 4 processors, but Tomcat only seems to use > > > one. Does the 1.4.2 JVM support MP? > > Yes, at least on Sun hardware with Solaris 8, and Intel hardware with RH > Linux 7.x (duals only...we don't have quads). Don't know about Windows. > > > 2. We have IIS on the front end, and we are currently not able to > > migrate to Apache. We'd like to use the connectors (jk or jk2) to do > > load-balancing and failover. Do these connectors provide the support > > we need? Should be use a clustering architecture like JavaSpaces > > (http://www.onjava.com/lpt/a/2422) instead? > > The connectors can load balance, but unfortunately the IIS versions are > sort of a crapshoot in my mind. > > > 3. We plan on deploying 42+ applications to a number of Tomcat > > servers. Since each application will support 1 customer - I think it's > > > a good idea to have 1 app -> 1 tomcat - so if Tomcat crashes, it only > > affects that customer > > - rather than all customers. I've heard of setting up a CATALINA_BASE > to > > share Tomcat's core files, and then setup webapps directories for each > > customer. Does this sound reasonable? Have have others done > something like > > this? > > I agree with Yoav. All the way back with Tomcat 3.1 we had ours setup > this way: > > 1 virtual host = 1 Tomcat instance = 1 VM = 1 application > > We've had a couple dozen set up like this for a long time, works like a > charm. I prefer this over using CATALINA_BASE, as I can treat each > virtual host separately from any other, including giving each different > JVM memory settings, etc. Admittedly, we're an ASP, so we can dictate > how many web apps go with each virtual host, but I would think having > completely separate Tomcat instances would make sense in most real > production environments. The only thing you "lose" with multiple Tomcat > instances is disk space, and disk is cheap. > > John > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED]
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