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Services, Directories, and Applications
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The following options are commonly set in the virtual hosts configuration section:
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<VirtualHost www.cassowary.net> ServerAdmin webmaster@paulwatters.com DocumentRoot /opt/apache1.3.9/htdocs/www.cassowary.net ServerName www.cassowary.net ErrorLog /opt/apache1.3.9/logs/www.cassowary.net-error_log CustomLog /opt/apache1.3.9/logs/www.cassowary.net-access_log common </VirtualHost>
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This example defines a single virtual host (called www.cassowary.net), in addition to the default host for the Apache HTTP Server. Virtual host support allows you to keep separate logs for errors and access, as well as a completely separate document root to the default server. This makes it very easy to maintain multiple virtual servers on a single physical machine.
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Starting Apache
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Apache is bundled with a control script (apachectl) that can be used to start, stop, and report on the status of the server. To obtain help on the apachectl script, use the following command:
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$ /opt/apache1.3.9/apachectl help usage: /opt/apache1.3.9/apachectl (start|stop|restart|fullstatus|status|graceful|configtest|help) start stop restart - start httpd - stop httpd - restart httpd if running by sending a SIGHUP or start if not running fullstatus - dump a full status screen; requires lynx and mod_status enabled status - dump a short status screen; requires lynx and mod_status enabled graceful - do a graceful restart by sending a SIGUSR1 or start if not running configtest - do a configuration syntax test help - this screen
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To start Apache, you simply need to issue the following command from the same directory:
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$ /opt/apache1.3.9/apachectl start
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To stop the service, you may use the following command from the same directory:
$ /opt/apache1.3.9/apachectl stop
33:
Web Applications and Services
If you change the Apache configuration file and need to restart the service so that the server is updated, simply use the following command from the same directory:
$ /opt/apache1.3.9/apachectl restart
Once Apache is running on port 80, clients will be able to begin requesting HTML pages and other content.
Sun Java System Application Server
The Sun Java System Application Server is a J2EE-compliant platform for deploying enterprise Java applications, in conjunction with existing CGI and Netscape Server API (NSAPI) applications. By integrating all server-side application support under a single service regime, it is possible to minimize administration overhead, achieve better scaling through tight integration, and provide combined monitoring and event notification support. Historically, server-side applications providing back-end and middleware services have used front-end presentation layers, in the form of HTML pages, JSP pages, applets, and applications to give users combined access to numerous data sources. By implementing business logic using the J2EE model, you can avoid the pitfalls associated with multiprocess applications, such as those written for use with Web servers that support CGI, by using Java s multithreading capabilities. Enterprise JavaBeans (EJBs) are one of the key technologies supported by J2EE. These distributed components are of three varieties: Stateless session beans Store data and perform operations that are not stateful Stateful session beans Store data and perform operations that are stateful Entity beans Allow object operations to be easily mapped onto relational database tables By using stateful session beans to support user sessions, entity beans to persist data, and stateless session beans to provide a low-overhead interface to entity beans, you can build entire applications on the EJB infrastructure. While the myriad layers and parameters associated with an EJB deployment can be mind-boggling, fortunately the Sun Java System Application Server provides advanced deployment tools to ease and automate many aspects of this process. By implementing a distributed object platform, server-side applications can be expanded to span across multiple servers and clusters, improving scalability and reducing bottlenecks. The relationships between the various layers of EJB technology are shown in Figure 33-1. Although most Java application servers support the J2EE specification, given the wide variety in licensing costs, it s important to understand what features set the Sun Java System Application Server apart from the competition.
Part VI:
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