Terracotta and Tomcat Clustering

st0627

　　原网址：http://javadrama.blogspot.com/2012/10/terracotta-and-tomcat-clustering-page-2.html
　　Now, download apache-tomcat-6.0.35 and extract it twice to two directories of your choice, i will refer to them as ${CATALINA_HOME_NODE1} and ${CATALINA_HOME_NODE2}.



Copy Terracotta Libraries

we need two jar files to be copied to both Tomcats lib directory.

${TC_HOME}\common\terracotta-toolkit-1.6-runtime-5.0.0.jar

${TC_HOME}\sessions\terracotta-session-1.3.0.jar

 

Copy Terracotta Config File

we need to copy the same Terracotta configuration file to the conf directory of bothTomcats

${TC_HOME}\config\tc-config.xml




one small change to do, the client log location, both clients (Tomcat servers) can't be configured with the same client log location.




edit ${CATALINA_HOME_NODE2}\conf\tc-config.xml

change log location under the clients tag 
<logs>%(user.home)/terracotta/client-logs</logs>



to be 
<logs>%(user.home)/terracotta/client-logs2</logs>



Terracotta Valve



Tomcat connects to Terracotta by intercepting requests via a value, now let's hook that valve.

under the conf directory of both Tomcats, edit the file context.xml to look like this: 
<Context>
<!-- Default set of monitored resources -->
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<!-- Uncomment this to disable session persistence across Tomcat restarts -->
<Manager pathname="" />
<!-- Hook the Terracotta Valve and configure it using the tc-config.xml file -->
<Valve className="org.terracotta.session.TerracottaTomcat60xSessionValve" tcConfigUrl="../conf/tc-config.xml"/>
</Context>




note that we have disabled session persistence across Tomcat restarts because that is a task for Terracotta now.

Tomcat HA Configurations



 

 

jvmRoute

 

we need to define a unique jvmRoute for each Tomcat server.




edit ${CATALINA_HOME_NODE1}\conf\server.xml, change the Engine tag to look like this: 
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">



 

edit ${CATALINA_HOME_NODE2}\conf\server.xml, change the Engine tag to look like this: 
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">


Make sure you don't have port conflicts

as i am running both Tomcats on the same box, i had to change the ports for the second Tomcat.
in ${CATALINA_HOME_NODE2}\conf\server.xml, i have changed
shutdown port: 8005 to 8006
http port: 8080 to 8081
ajp port: 8009 to 8010

Run both Tomcats



open two more terminals and navigate to ${CATALINA_HOME_NODE1}\bin on one and ${CATALINA_HOME_NODE2}\bin on the other, on both terminals execute: 
startup.bat




if everything went as it should, you should see something like that on both Tomcat terminals 
Terracotta 3.7.0, as of 20120717-133013 (Revision unknown-20453 by cruise@rh5vmo113.terracotta.lan from 3.7.0)
Successfully loaded base configuration from file at 'H:\terracotta\apache-tomcat-6.0.35\bin\.\..\conf\tc-config.xml'.
Successfully loaded base configuration from file at 'H:\terracotta\apache-tomcat-6.0.35\temp\tc-config8509448930662041153.xml'.
Log file: 'C:\terracotta\client-logs\terracotta-client.log'.
Connection successfully established to server at 127.0.0.1:9510


Test it

Tomcat comes by default with a web application called examples, we will use it till the end of this tutorial to test our setup

point your browser to http://localhost:8080/examples/ and http://localhost:8081/examples/ and make sure both servers are responding.

open your Terracotta Development Console and make sure that both clients (the tomcat server) are present as below.

http://five.rdaili.com/sohu.com.php?u=2hpDLnla4MzrNVZwR47dqRDhGv36V5faha1RhECmgMDBe0zfjq1X4kAPlCcOabRbRzsKY852vv%2B5EL7ZUKHnjRBltsoaurGvi2YHAObjQvgWmg%3D%3D&b=3

 

also note that the sessions button is now active.