Catalyst::Manual::Deployment::FastCGI - Deploying Catalyst with FastCGI
FastCGI is a high-performance extension to CGI. It is suitable for production
environments, and is the standard method for deploying Catalyst in shared
FastCGI performs equally as well as mod_perl. Don't let the 'CGI' fool you; your
app runs as multiple persistent processes ready to receive connections from
the web server.
When using external FastCGI servers, your application runs as a standalone
application server. It may be restarted independently from the web server.
This allows for a more robust environment and faster reload times when pushing
new app changes. The frontend server can even be configured to display a
friendly "down for maintenance" page while the application is
You can launch your application on multiple backend servers and allow the
frontend web server to perform load-balancing among all of them. And of
course, if one goes down, your app continues to run.
Multiple versions of the same app
Each FastCGI application is a separate process, so you can run different
versions of the same app on a single server.
Can run with threaded Apache
Since your app is not running inside of Apache, the faster mpm_worker module can
be used without worrying about the thread safety of your application.
FastCGI is compatible with many server implementations, not just Apache.
You may have to disable mod_deflate. If you experience page hangs with
mod_fastcgi then remove deflate.load and deflate.conf from mods-enabled/
More complex environment
With FastCGI, there are more things to monitor and more processes running than
when using mod_perl.
In server mode the application runs as a standalone server and accepts
connections from a web server. The application can be on the same machine as
the web server, on a remote machine, or even on multiple remote machines.
Advantages of this method include running the Catalyst application as a
different user than the web server, and the ability to set up a scalable
To start your application in server mode, install the FCGI::ProcManager module
and then use the included fastcgi.pl script.
$ script/myapp_fastcgi.pl -l /tmp/myapp.socket -n 5
Command line options for fastcgi.pl include:
-d -daemon Daemonize the server.
-p -pidfile Write a pidfile with the pid of the process manager.
-l -listen Listen on a socket path, hostname:port, or :port.
-n -nproc The number of processes started to handle requests.
See below for the specific web server configurations for using the external
Any web server which supports FastCGI should work with Catalyst. Configuration
recipes for well-known web servers are linked below, and we would welcome
contributions from people deploying Catalyst on other web servers.
Catalyst Contributors, see Catalyst.pm
This library is free software. You can redistribute it and/or modify it under
the same terms as Perl itself.