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= Using MoinMoin with FastCgi =

[[TableOfContents]]

[http://fastcgi.com FastCGI] is a method which enables apache to communicate
with long-running scripts. This has the advantage that the script is only
started and initialized one time, and that data could be cached in memory
from request to request, enhancing the performance of the CGI application.

== Deploying on Apache ==

To deploy MoinMoin using FastCGI you need an apache with mod_fastcgi. Please
refer to the documentation of mod_fastcgi how to build it.

Follow the basic apache installation for your operating system as described in other parts of the MoinMoin installation documentation. This is HelpOnInstalling/ApacheOnLinux in most cases. Don't forget to install the fastcgi Apache module (e.g. libapache2-mod-fastcgi). Then in places where the documentation refers to `moin.cgi` you use `moin.fcg` instead. Be sure that '''.fcg''' is handled by the FastCGI module (`AddHandler fastcgi-script .fcg` in your apache config).

Normally apache will start CGI scripts with its own user and group, or
with the user and group of the !VirtualHost if you are using the suexec
wrapper. To enable this with FastCGI you need to use `FastCgiWrapper On`
in your apache config (see FastCGI Documentation).

Be sure to restart your apache after you changed py files (i.e. the config)
for a running FastCGI server, or you won't see any changes!

=== Example for Apache2 on Debian ===
Edit the /etc/apache2/conf.d/your_wiki:
{{{
<IfModule mod_fastcgi.c>
   AddHandler fastcgi-script .fcgi .fcg
   FastCgiServer /your/path/to/moin.fcg -idle-timeout 60 -processes 1
   ScriptAlias /your_wiki "/your/path/to/moin.fcg"
</IfModule>
}}}
 * number of processes depends on your hardware..
Expand the Apache installation:
{{{
apt-get install libapache2-mod-fastcgi
a2enmod fastcgi
apache2ctl graceful
}}}
Now, your wiki should respond a little faster.

=== Running as an external application and/or on Windows ===

MoinMoin can be run as an external application that answers FastCGI request via a local TCP/IP socket. This works on Windows as well. All you need to do (after having installed `mod_fastcgi` and a working MoinMoin instance) is this:

 1. Select a port number for the internal communication. It should be larger than 1023. For this example, we chose 8888 (just for fun).

 1. Add the following lines to your httpd.conf:{{{
Alias /moin.fcg "/your/path/to/moin.fcg"
FastCgiExternalServer "/your/path/to/moin.fcg" -host localhost:8888
}}}

 1. Edit `moin.fcg`. Replace{{{
fcg = thfcgi.THFCGI(handle_request)
}}} with {{{
fcg = thfcgi.THFCGI(handle_request, 0, 8888)
}}}

 1. Start the file `moin.fcg` manually like a Python script:{{{
python moin.fcg
}}}

 1. Start Apache.

=== Fallback to CGI if FastCGI is not available ===

Install and test MoinMoin according to HelpOnInstalling/ApacheOnLinux. Then make and test the changes to run mod_fastcgi. If you are satisfied, you can add the following block to your apache config:
{{{
<IfModule !mod_fastcgi.c>
    ScriptAlias /mywiki "/your/path/to/moin.cgi"
</IfModule>
<IfModule mod_fastcgi.c>
    AddHandler fastcgi-script .fcg
    ScriptAlias /mywiki "/your/path/to/moin.fcg"
</IfModule>
}}}
Now Apache will use mod_fastcgi if available and otherwise use the slow cgi script.

== Deploying on lighttpd ==

The best option is to run moin as external application. In this case, you don't need to restart the web server when you want to restart moin.

=== Configuration ===

{{{
fastcgi.server = ( "/mywiki" =>
                       ( "localhost" =>
                         (
                           "host" => "127.0.0.1",
                           "port" => 8888,
                           "check-local" => "disable",
                           "broken-scriptfilename" => "enable",
                         )
                       )
                   )
}}}

 (!) You will see a lot of "2005-12-02 16:30:11: (mod_fastcgi.c.2373) FastCGI-stderr:" errors in
lighttpd's error log, the reason is not clear.

=== Starting MoinMoin instance ===

To start a MoinMoin instance, either follow the changes in "Running as an external application and/or on Windows" above, or run moin.fcg using `spawn-fcgi` (installed with lighttpd).

{{{
cd /www/org.mywiki/bin
sudo -u www /usr/local/bin/spawn-fcgi -f ./moin.fcg -P moin.pid
}}}

To stop the instance later:
{{{
sudo kill `cat moin.pid`
}}}

 (!) Running spawn-fcgi as root and using -u www -g www fail because of Python ImportError, the reason is not clear. sudo -u www seems to have to same effect.

=== Multiple moin processes ===

If you start multiple moin instances on different ports, lighttpd balance the load automatically between them, using all the cpus.

Use this configuration:
{{{
fastcgi.server             = ( "/mywiki" =>
                               ( "localhost" =>
                                 ( "host" => "127.0.0.1", 
                                   "port" => 1080,
                                   "check-local" => "disable",
                                   "broken-scriptfilename" => "enable",
                                 ),
                                 ( "host" => "127.0.0.1", 
                                   "port" => 1081, 
                                   "check-local" => "disable",
                                   "broken-scriptfilename" => "enable",
                                 ),
                               )
                             )
}}}

=== Multiple moin processes automatically started by lighttpd ===

As an alternative to manually starting multiple processes of moin.fcg and assigning a distinct TCP port to each, this task can be delegated to lighttpd itself. The key is to specify "bin-path" option to fastcgi.server, and to allow multiple moin.fcg processes to be started as configured by "min-procs" and "max-procs" options. The hidden trick is that lighttpd will allocate successive TCP port numbers to each process, starting with "port".
Tested with lighttpd 1.4.10.

Example:
{{{
fastcgi.server = (  "/mywiki" =>
  (( "docroot"   => "/",
     "min-procs" => 4,
     "max-procs" => 4,
     # allocate successive port numbers for each process, starting with "port"
     "bin-path"  => "/usr/local/bin/moin.fcg",
     "host"      => "127.0.0.1",
     "port"      => 2200,
     "check-local" => "disable",
     "broken-scriptfilename" => "enable",
  ))
)
}}}

=== MoinMoin Startup script ===

Here is a startup script for Mac OS X, using DarwinPortsStartup system. It is probably useful for other unix like platforms.

{{{
#!/bin/sh

# Start and stop multiple moin fast cgi instances runnings on PORTS

NAME="moin"
DIR="/www/org.mywiki/bin"
FCGIAPP="./moin.fcg"
PREFIX="/usr/local"

# List of ports to start moin instances on, separated with whitesapce
# Keep in sync with fastcgi.server in lighttpd.conf
PORTS="1080 1081"

start_on_port () {
    # Start moin instance on port, leaving pid file
    port=$1
    
    cd "${DIR}" && sudo -u www "${PREFIX}/bin/spawn-fcgi" \
        -f "${FCGIAPP}" \
        -p $port \
        -P "${NAME}-${port}.pid" \
        > /dev/null
}

kill_on_port () {
    # Try to kill process using pid in pid file, then remove the pid file
    pidFile="${DIR}/${NAME}-$1.pid"
    kill `cat "$pidFile"` && rm -f "$pidFile" > /dev/null 
}

start () {
    for port in $PORTS; do start_on_port $port; done 
}

stop () {
    for port in $PORTS; do kill_on_port $port; done
}

case "$1" in
start)
    # XXX starting twice will break pid files (bug in spawn-fcgi)
    start && echo -n " $NAME"
	;;
stop)
	stop && echo -n " $NAME"
	;;
restart)
    stop
    start && echo -n " $NAME"
	;;
*)
	echo "Usage: `basename $0` {start|stop|restart}" >&2
	;;
esac

exit 0
}}}

=== Adding MoinMoin startup script on Mac OS X ===

With this script, moin instances will be started automatically on startup.

 1. Install [http://darwinports.opendarwin.org/getdp/ darwinports]
 2. Install DarwinPortsStartup package: {{{
sudo port install DarwinPortsStartup
}}}
 3. Copy moin.sh into `/opt/local/etc/rc.d`: {{{
sudo cp moin.sh /opt/local/etc/rc.d
}}}
