Terracotta and Tomcat Clustering - Page 二

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

?

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

?

?

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.

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