cgi

CGI may refer to: read more at WikiPedia


  • Since I am facing performance problem due to the load of visitors and a badly configured server, I decide today to document my findings in this new series of articles.

    FastCGI is an extention to CGI that increases speed. Instead of creating a new process every time a page is reloaded, FastCGI will use the same process, queuing up requests. This increases startup speed, at the expense of forcing users to wait for the previous requests to finish. FastCGI also allows programs to get the web server to do certain operations, like reading in a file, before the request is handed over. [WikiPedia]

    FastCGI provides a way to keep PHP frequently-run script files loaded on Your server so that script are already preloaded and initialized the next time they are used. This can make some scripts run up to five times more quickly (in most cases it's as fast as mod_php, without the drawbacks). Moreover You can run different version of PHP (PHP4 and PHP5) in the same server...

    Server: Strato (www.strato.de)
    Operating system: SuSE / openSuSE
    Requirements: root access and basic Unix knowledge

     

    1 Use yast2 to install mod_fastcgi on the system, this will create files (*.so) in   /usr/lib/apache2-worker/ and  /usr/lib/apache2-prefork/
    2 Edit the file  
    # vi /etc/sysconfig/apache2

    and add fastcgi, suexec
    remove php4/php5 if any

    APACHE_MODULES="fastcgi cache mem_cache deflate headers access actions alias auth auth_dbm autoindex cgi dir env expires include log_config mime negotiation setenvif ssl   userdir php4 php5 perl     rewrite suexec"
    3 create a new file in /etc/apache2/conf.d/mod_fastcgi.conf

    vi /etc/apache2/conf.d/mod_
    fastcgi.conf

    and add these lines, at the end of file, adapt all path according to your system. Keep in mind, I have a SuSE system


    <IfModule mod_fastcgi.c>
        ScriptAlias /fcgi-bin/ /srv/www/fcgi-bin/
        FastCgiIpcDir /var/lib/apache2/fastcgi
        # FastCGI applications can be static, dynamic, or external.
        # Dynamic FastCGI applications can be put in this directory.
        # Use the FastCgiConfig directive in your httpd.conf.local
        # to change the defaults for them.
        # http://www.fastcgi.com/mod_fastcgi/docs/
        # mod_fastcgi.htmlFastCgiConfig

        <Directory "/srv/www/fcgi-bin">
            AllowOverride None
            Options +ExecCGI -Includes
            SetHandler fastcgi-script
            Order allow,deny
            Allow from all
        </Directory>
        AddHandler fastcgi-script fcg fcgi fpl

        # Static or external FastCGI applications are started when apache
        # is started. They are configured with the
        # FastCgiServer and FastCgiExternalServer directives:
        # http://www.fastcgi.com/mod_fastcgi/docs/
        # mod_fastcgi.htmlFastCgiServer

        # http://www.fastcgi.com/mod_fastcgi/docs/
        # mod_fastcgi.htmlFastCgiExternalServer

        # which can be put into httpd.conf.local.
        #
        # Examples:
        FastCgiServer /srv/www/fcgi-bin/echo -processes 5
        FastCgiServer /srv/www/htdocs/some/path/echo.fcgi
        # see http://www.FastCGI.com/docs/faq.htmltypical_httpd.conf
        # for more  information...


        Alias /php5-fcgi/ /srv/www/cgi-bin/
        FastCgiServer /srv/www/cgi-bin/php5  -processes 5
        AddType application/x-httpd-fastphp5 .php5
        Action application/x-httpd-fastphp5 /php5-fcgi/php5

        Alias /php4-fcgi/ /srv/www/cgi-bin/
        FastCgiServer /srv/www/cgi-bin/php  -processes 5
        AddType application/x-httpd-fastphp4 .php
        Action application/x-httpd-fastphp4 /php5-fcgi/php

    </IfModule>

    4 start
    # apache2-reconfigure-mpm
    this recreate the file  /etc/apache2/sysconfig.d/loadmodule.conf
    and restart apache automatically.

    References: