9425990f53
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@835178 13f79535-47bb-0310-9956-ffa450edef68
76 lines
2.2 KiB
Text
76 lines
2.2 KiB
Text
WebApp Load Balancing Demo
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===========================
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Demonstrates balancing load acoss SCA services by deploying an SCA composite
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to two tomcat servers in a cluster. The tomcat servers sit behind an Apache
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server which directs load to one or other tomcat server based on a set of rules.
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The mvn pom distributed with this sample will download, install and configure
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two Tomcat servers automatically to act as workers. You need to install the
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Apache web server and configure it manually.
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1 - Install and configure the Tomcat workers
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mvn
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This results in two tomcat servers at
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target/tomcat-8085
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target/tomcat-8086
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2 - Install and configure the Apache server to balance load
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In this case we've chosen to use the native JK connector. There are several
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resources that tell you how to configure Apache for load balancing Tomcat with
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the JK connector. For example,
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http://tomcat.apache.org/connectors-doc/webserver_howto/apache.html
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http://www.crazysquirrel.com/computing/debian/servers/tomcat55.jspx
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Here is a high level summary
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Download the latest version of Apache 2.2 (this demo was built with Apache 2.2.6)
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http://httpd.apache.org/
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Install in a local director called, say, apache
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Download the mod_jk module (in binary form if you can)
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http://tomcat.apache.org/download-connectors.cgi
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Install it in apache/modules
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Configure the mod_jk module
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Copy src/test/resources/apache-80/conf/workers.properties to apache/conf
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Append the contents of src/test/resources/apache-80/conf/httpd.conf to apache/conf/httpf.conf
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3 - Start the apache and tomcat servers
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In three command prompts
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cd target/tomcat-8085
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bin/catalina run
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cd target/tomcat-8086
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bin/catalina run
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cd apache
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bin/httpd
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4 - Run the client
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run the LanchClient program - TBD - need a script
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5 - Result
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The client will make 10 calls to the SCA service described in the helloworldws.composite that
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is part of the webapp deployed to the tomcat servers. You will see the result of this
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service call reported at the client in the form
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Called getGreetings
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Hello World 6
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If you look at the Tomcat consoles you will see that each server deals with half the requests
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as the load is balanced equally between the two of them.
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