Lab Exercises in .NET

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Lab Exercises
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1 From the Web site http://jakartaapacheorg download the latest stable binary version of Jakarta-Tomcat; as of this writing, the latest version is 321 For simplicity, put the Jakarta-Tomcat tarball in the same directory as jdk (eg, /opt):
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cd /opt tar xvzf jakarta-tomcat-321targz
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2 The next step involves editing /etc/profile to include the following environment variables:
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export CLASSPATH=/opt/jakarta-tomcat-321/srcjar:/JAVA-DIR/jakartatomcat-321/ servletjar: export TOMCAT_HOME=/opt/jakarta-tomcat-321
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3 Next, download the mod_jservso from http://jakartaapacheorg/ builds/jakarta-tomcat/release/ v321/bin/linux/i386 Place this file in the /JDK/jakarta-tomcat-321 directory 4 Copy the tomcat-apacheconf file (or tomcatconf) to tomcat-jservconf Edit the Apache configuration file, httpdconf, to include the following line:
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Include /opt/jakarta-tomcat-321/tomcat-jservconf
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5 Make sure the mod_jservso file is referenced correctly in tomcat-jservconf The first line of tomcat-jservconf should include the following:
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LoadModule jserv_module /opt/jakarta-tomcat-321/mod_jservso
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6 Restart Apache using the init scripts or the apachectl script (eg, /etc/rdd/initd/httpd restart or /etc/httpd/apache restart)
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Apache and Tomcat
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7 Start Tomcat using the following:
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/opt/jakarta-tomcat-321/bin/startupsh
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8 To test the new setup, point your browser to http://localhost/examples/servlets/ 9 Click on the links to execute the various examples of servlets
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Questions
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1 Why would one use Tomcat in conjunction with Apache 2 What technologies, other than Java servlets, provide dynamic content
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Answers
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1 Tomcat, along with Apache, can host CGI scripts as easily as Java servlets 2 CGI scripts written in Perl, C, or shell scripts
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Advanced Questions
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1 Compare and contrast Java servlets and CGI scripts 2 Write a servlet to display user input
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Configuration of a Proxy
Purpose
The purpose of this lab is to teach you how to configure a caching HTTP proxy A proxy can perform some of a firewall s functions, but typically it is used to allow users to access Web pages from behind a firewall or to speed up performance of an Internet connection
Theory
A proxy server is a machine that processes requests for data from one system, then passes that request on to the proper server Proxies are often used to process HTTP requests through a firewall If the proxy also saves requested data, it becomes a caching proxy Because they store information locally and do not need to access the primary server, caching proxies allow more efficient use of the network Apache s functionality may be extended to include proxy features by using the module mod_proxy
Lab VII
Installing mod_proxy
The first step to setting up Apache as a proxy server is to install mod_proxy Apache can be updated with mod_proxy in two ways First, Apache can be recompiled to include mod_proxy in the core distribution Second, if Apache has Dynamic Shared Object (DSO) support, mod_proxy can be inserted as a module at run time For this lab, mod_proxy will be loaded as a module at run time Therefore, Apache must have mod_so compiled, which will provide loadable module support
Configuring httpd
After mod_proxy has been integrated into Apache, httpdconf must be changed to take advantage of the proxying features This is done by adding directives recognized by mod_proxy to httpdconf Table VII1 lists some of the most common directives supported by mod_proxy A more detailed list of directives for mod_proxy can be found on the Apache Web site: http://httpdapacheorg/doc/mod/mod_proxyhtml After making changes to httpdconf, the Web server must be restarted for the configuration changes to take place
Table VII1
mod_proxy Directives DESCRI PTION Determines if Apache will function as a proxy Specifies a proxy for Apache to use Converts requests for local data to a proxy request Blocks proxy connections to specified sites Instructs Apache to serve requests directly, instead of proxying Appends the domain name within intranets Sets the directory to write cache files to Sets the size of the cache in kilobytes Specifies locations not to cache from
DI RECTIVE ProxyRequests ProxyRemote ProxyPass ProxyBlock NoProxy ProxyDomain CacheRoot CacheSize NoCache
Configuration of a Proxy
Configuring the Client
Once the proxy server has been properly set up, any client wishing to use the proxy server must be configured to use the server This is done by making changes to the client s Web browser settings For the purposes of this lab, it is assumed that the client is running Netscape Navigator for HTTP connections After the settings have been changed, the client should be able to make HTTP connections through the newly configured proxy