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php

    1: Using PHP 5 with the Zeus Web Server
    2: -----------------------------------
    3: 
    4: Zeus fully supports running PHP in combination with our
    5: webserver. There are three different interfaces that can be used to
    6: enable PHP:
    7: 
    8: * CGI
    9: * ISAPI
   10: * FastCGI
   11: 
   12: Of the three, we recommend using FastCGI, which has been tested and
   13: benchmarked as providing the best performance and reliability.
   14: 
   15: Full details of how to install PHP are available from our
   16: website, at:
   17: 
   18: http://support.zeus.com/products/php.html
   19: 
   20: If you have any problems, please check the support site for more
   21: up-to-date information and advice.
   22: 
   23: 
   24: Quick guide to installing CGI/FastCGI with Zeus
   25: -----------------------------------------------
   26: 
   27: Step 1 - Compile PHP as FastCGI.
   28: 
   29: Compile as follows:
   30:         ./configure --enable-fastcgi
   31:         make
   32: 
   33: Note that PHP has many options to the configure script -
   34: e.g. --with-mysql. You will probably want to select your usual options
   35: before compiling; the above is just a bare minimum, for illustration.
   36: 
   37: After compilation finishes, you will be left with an executable
   38: program called 'php'. Copy this into your document root, under a
   39: dedicated FastCGI directory (e.g. $DOCROOT/fcgi-bin/php)
   40: 
   41: 
   42: Step 2 - configure Zeus
   43: 
   44: Four stages:
   45:         -  enable FastCGI
   46:         -  configure FastCGI
   47:         -  setup alias for FastCGI
   48:         -  setup alias for PHP
   49: 
   50: 1) Using the admin server, go to the 'module configuration' page for
   51: your virtual server, and ensure that 'fastcgi' is enabled (select the
   52: tickbox to the left).
   53: 
   54: 2) While we can run FastCGI's locally, there are known problems with
   55: some OS's (specifically, the communication between web server and
   56: FastCGI happens over a unix domain socket, and some OS's have trouble
   57: sustaining high connection rates over these sockets). So instead, we
   58: are going to set up the PHP FastCGI to run 'remotely' over localhost
   59: (this uses TCP sockets, which do not suffer this problem). Go to the
   60: 'fastcgi configuration' page, and under 'add remote fastcgi':
   61:         Add Remote FastCGI
   62:                 Docroot path            /fcgi-bin/php
   63:                 Remote machine          localhost:8002
   64: The first entry is where you saved PHP, above.
   65: The second entry is localhost:<any unused port>
   66: We will start the FastCGI listening on this port shortly.
   67: Click 'update' to commit these changes.
   68: 
   69: 3) Go to the path mapping module and add an alias for FastCGI:
   70:         Add Alias
   71:                 Docroot path            /fcgi-bin
   72:                 Filesystem directory    /path/to/docroot/fcgi-bin
   73:                 Alias type              fastcgi
   74: Click 'update' to commit these changes
   75: 
   76: 4) Also on the path mapping module, add a handler for PHP:
   77:         Add handler
   78:                 File extension          php
   79:                 Handler                 /fcgi-bin/php
   80: Click 'update' to commit these changes
   81: 
   82: Finally restart your virtual server for these changes to take effect.
   83: 
   84: 
   85: Step 3 - start PHP as a FastCGI runner
   86: 
   87: When you start PHP, it will pre-fork a given number of child processes
   88: to handle incoming PHP requests. Each process will handle a given
   89: number of requests before exiting (and being replaced by a newly
   90: forked process). You can control these two parameters by setting the
   91: following environment variables BEFORE starting the FastCGI runner:
   92: 
   93: PHP_FCGI_CHILDREN - the number of child processes to pre-fork. This
   94: variable MUST be set, if not then the PHP will not run as a FastCGI.
   95: We recommend a value of 8 for a fairly busy site. If you have many,
   96: long-running PHP scripts, then you may need to increase this further.
   97: 
   98: PHP_FCGI_MAX_REQUESTS - the number of requests each PHP child process
   99: handles before exiting. If not set, defaults to 500.
  100: 
  101: To start the FastCGI runner, execute '$ZEUSHOME/web/bin/fcgirunner
  102: 8002 $DOCROOT/fcgi-bin/php'.  Substitute the appropriate values for
  103: $ZEUSHOME and $DOCROOT; also substitute for 8002 the port you chose,
  104: above.
  105: 
  106: To stop the runner (e.g. to experiment with the above environment
  107: variables) you will need to manually stop and running PHP
  108: processes. (Use 'ps' and 'kill'). As it is PHP which is forking lots
  109: of children and not the runner, Zeus unfortunately cannot keep track
  110: of what processes are running, sorry. A typical command line may look
  111: like 'ps -efl | grep $DOCROOT/fcgi-bin/php | grep -v grep | awk
  112: '{print $4}' | xargs kill'