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You can change myapps with whatever you like If you do change this, make sure that you also change it in any other location where it is mentioned in this discussion Here the Apache server serving static pages is being told that all requests to the /myapps URL are to be serviced via the proxy module, which should get the response from the Apache server running on the same Linux system (127001 is the localhost) but on port 8080 4 Add the following configuration in httpd-8080conf to create a mod_perl script location
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<Location /myapps> SetHandler perl-script PerlHandler MyApp1 </Location>
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Don t forget to change MyApp1 to whatever your script s name is 5 If you have KeepAlive On in httpd-8080conf, change it to Off This ensures that Apache does not keep the connection open for KeepAliveTimeout-specified number of seconds in the hope of serving new clients from the same TCP connection 6 Start (or restart) the Apache server (listening on port 80) as usual by using the apachectl command However, you have to start the Apache on port 8080 by using the /usr/local/apache/bin/httpd f /usr/local/ apache/conf/httpd-8080conf command This assumes that you have installed the /usr/local/apache directory; if that is not so, make sure you change the path
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22 Speeding Up Apache
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Now you have two Apache parent daemons (that is, run as root) running two sets of child processes where one services static pages and uses the proxy module to fetch the dynamic mod_perl script pages by using the ProxyPass directive This allows you to service the static pages using a set of child servers that are not running any Perl code whatsoever On the other hand, the server on port 8080 only services dynamic requests; thus, you effectively have a configuration that is very performance-friendly
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Going with FastCGI instead of mod_perl
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Scripts running under mod_perl run fast because they are loaded within each child-server s code space Unlike its CGI counterpart, a mod_perl script can maintain a persistent connection to an external database server This means that database-driven dynamic content generation becomes fast with mod_perl scripts However, a new problem introduces itself if you run a very large Web server When you run 50 or more Apache server processes to service many simultaneous requests, it is possible for Apache to eventually open up that many database connections and to keep each connection persistent for the duration of each child Say that you run a Web server system through which you run 50 Apache child processes so that you can service approximately 50 requests per second and you happen to have a mod_perl-based script that opens a database connection in the initialization stage As requests come to your database script, Apache services such requests by using each of its child processes and thus opening up 50 database connections Because many database servers allocate expensive resources on a per-connection basis, this could be a major issue on the database side For example, when making such connections to a IBM Universal Database Server (UDB) Enterprise Edition running on a remote Linux system, each Apache child has a counterpart connection-related process on the database server If such environment uses load-balancing hardware to balance incoming requests among a set of mod_perl-enabled Apache Web servers, there is likely to be a scenario when each Web-server system, which is running 50 Apache child processes, has all of the child processes opened and connected to the database server For example, if such an environment consists of 10 Web servers under the load-balancing hardware, then the total possible connections to the database server is 10 50, or 500 connections, which might create an extensive resource load on the database server One possible solution for such a scenario is to find a way to have the database time-out idle connections, make the mod_perl script code detect stale connections, and have the code reinitiate connection Another solution is to create a persistent database proxy daemon that each Web server uses to fetch data from the database Fortunately, FastCGI or Java Servlets has a more native solution for such problems and should be considered for heavily used database-driven applications The next section discusses another performance-boosting Web technology called FastCGI
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