= Trac with FastCGI =

Since version 0.9, Trac supports being run through the [http://www.fastcgi.com/ FastCGI] interface. Like [wiki:TracModPython mod_python], this allows Trac to remain resident, and is faster than external CGI interfaces which must start a new process for each request. However, unlike mod_python, it is able to support [http://httpd.apache.org/docs/suexec.html SuEXEC]. Additionally, it is supported by much wider variety of web servers.

== Simple Apache configuration ==
{{{
# Enable fastcgi for .fcgi files
# (If you're using a distro package for mod_fcgi, something like
# this is probably already present)
<IfModule mod_fastcgi.c>
   AddHandler fastcgi-script .fcgi
   FastCgiIpcDir /var/lib/apache2/fastcgi 
</IfModule>
LoadModule fastcgi_module /usr/lib/apache2/modules/mod_fastcgi.so
}}}

You can either setup the `TRAC_ENV` as an overall default:
{{{
FastCgiConfig -initial-env TRAC_ENV=/path/to/env/trac
}}}

Or you can serve multiple Trac projects in a directory like:
{{{
FastCgiConfig -initial-env TRAC_ENV_PARENT_DIR=/parent/dir/of/projects
}}}

Configure `ScriptAlias` or similar options as described in TracCgi, but calling `trac.fcgi` instead of `trac.cgi`.

In Kubuntu, with libapache2_fcgid (version 1.07), the above did not work, with the error
{{{
Invalid command 'FastCgiConfig', perhaps mis-spelled or 
defined by a module not included in the server configuration.
}}} 
when apache is started. The solution was to use 
{{{
DefaultInitEnv TRAC_ENV /path/to/env/trac/
}}}

== Simple Lighttpd Configuration ==

The FastCGI front-end was developed primarily for use with alternative webservers, such as [http://www.lighttpd.net/ lighttpd].

lighttpd is a secure, fast, compliant and very flexible web-server that has been optimized for high-performance
environments.  It has a very low memory footprint compared to other web servers and takes care of CPU load.

For using `trac.fcgi` with lighttpd add the following to your lighttpd.conf:
{{{
fastcgi.server = ("/trac/" =>
                   ("trac" =>
                     ("socket" => "/tmp/trac-fastcgi.sock",
                      "bin-path" => "/path/to/cgi-bin/trac.fcgi",
                      "check-local" => "disable",
                      "bin-environment" =>
                        ("TRAC_ENV" => "/path/to/projenv")
                     )
                   )
                 )
}}}

Note that you will need to add a new entry to `fastcgi.server` for each separate Trac instance that you wish to run. Alternatively, you may use the `TRAC_ENV_PARENT_DIR` variable instead of `TRAC_ENV` as described  above.

For using two projects with lighttpd add the following to your lighttpd.conf:
{{{
fastcgi.server = ("/first" =>
                   ("first" =>
                    ("socket" => "/tmp/trac-fastcgi-first.sock",
                     "bin-path" => "/path/to/cgi-bin/trac.fcgi",
                     "check-local" => "disable",
                     "bin-environment" =>
                       ("TRAC_ENV" => "/path/to/projenv-first")
                    )
                  ),
                  "/second" =>
                    ("second" =>
                    ("socket" => "/tmp/trac-fastcgi-second.sock",
                     "bin-path" => "/path/to/cgi-bin/trac.fcgi",
                     "check-local" => "disable",
                     "bin-environment" =>
                       ("TRAC_ENV" => "/path/to/projenv-second")
                    )
                  )
                )
}}}
Note that field values are different.
{{{
#!html
<p style="background: #fdc; border: 2px solid #d00; font-style: italic; padding: 0 .5em; margin: 1em 0;">
<strong>Note from c00i90wn:</strong> It's very important the order on which server.modules are loaded, if mod_auth is not loaded <strong>BEFORE</strong> mod_fastcgi, then the server will fail to authenticate the user.
</p>
}}}
For authentication you should enable mod_auth in lighttpd.conf 'server.modules', select auth.backend and auth rules:
{{{
server.modules              = (
...
  "mod_auth",
...
)

auth.backend               = "htpasswd"

# Separated password files for each project
# See "Conditional Configuration" in
# http://trac.lighttpd.net/trac/file/branches/lighttpd-merge-1.4.x/doc/configuration.txt

$HTTP["url"] =~ "^/first/" {
  auth.backend.htpasswd.userfile = "/path/to/projenv-first/htpasswd.htaccess"
}
$HTTP["url"] =~ "^/second/" {
  auth.backend.htpasswd.userfile = "/path/to/projenv-second/htpasswd.htaccess"
}

# Enable auth on trac URLs, see
# http://trac.lighttpd.net/trac/file/branches/lighttpd-merge-1.4.x/doc/authentication.txt

auth.require = ("/first/login" =>
                ("method"  => "basic",
                 "realm"   => "First project",
                 "require" => "valid-user"
                ),
                "/second/login" =>
                ("method"  => "basic",
                 "realm"   => "Second project",
                 "require" => "valid-user"
                )
               )


}}}
Note that lighttpd (I use version 1.4.3) stopped if password file doesn't exist.

Note that lighttpd doesn't support 'valid-user' in versions prior to 1.3.16.

Conditional configuration is also useful for mapping static resources, i.e. serving out images and CSS directly instead of through FastCGI:
{{{
# Aliasing functionality is needed
server.modules += ("mod_alias")

# Setup an alias for the static resources
alias.url = ("/trac/chrome/common" => "/usr/share/trac/htdocs")

# Use negative lookahead, matching all requests that ask for any resource under /trac, EXCEPT in
# /trac/chrome/common, and use FastCGI for those
$HTTP["url"] =~ "^/trac(?!/chrome/common)" {
# If you have previous fastcgi.server declarations for applications other than Trac, use += here
# instead of = so you won't overwrite them
fastcgi.server = ("/trac" =>
                   ("trac" =>
                     ("socket" => "/tmp/trac-fastcgi.sock",
                      "bin-path" => "/path/to/cgi-bin/trac.fcgi",
                      "check-local" => "disable",
                      "bin-environment" =>
                        ("TRAC_ENV" => "/path/to/projenv")
                     )
                   )
                 )
}
}}}
The technique can be easily adapted for use with multiple projects by creating aliases for each of them, and wrapping the fastcgi.server declarations inside conditional configuration blocks.
Also there is another way to handle multiple projects and it's to use TRAC_ENV_PARENT_DIR instead of TRAC_ENV and use global auth, let's see an example:
{{{
#  This is for handling multiple projects
  alias.url       = ( "/trac/" => "/path/to/trac/htdocs/" )

  fastcgi.server += ("/projects"  =>
                      ("trac" =>
                        (
                          "socket" => "/tmp/trac.sock",
                          "bin-path" => "/path/to/cgi-bin/trac.fcgi",
                          "check-local" => "disable",
                          "bin-environment" =>
                            ("TRAC_ENV_PARENT_DIR" => "/path/to/parent/dir/of/projects/" )
                        )
                      )
                    )
#And here starts the global auth configuration
  auth.backend = "htpasswd"
  auth.backend.htpasswd.userfile = "/path/to/unique/htpassword/file/trac.htpasswd"
  $HTTP["url"] =~ "^/projects/.*/login$" {
    auth.require = ("/" =>
                     (
                       "method"  => "basic",
                       "realm"   => "trac",
                       "require" => "valid-user"
                     )
                   )
  }
}}}

Changing date/time format also supported by lighttpd over environment variable LC_TIME
{{{
fastcgi.server = ("/trac" =>
                   ("trac" =>
                     ("socket" => "/tmp/trac-fastcgi.sock",
                      "bin-path" => "/path/to/cgi-bin/trac.fcgi",
                      "check-local" => "disable",
                      "bin-environment" =>
                        ("TRAC_ENV" => "/path/to/projenv",
                        "LC_TIME" => "ru_RU")
                     )
                   )
                 )
}}}
For details about languages specification see TracFaq question 2.11.

Other important information like [http://trac.lighttpd.net/trac/wiki/TracInstall this updated TracInstall page], [wiki:TracCgi#MappingStaticResources and this] are useful for non-fastcgi specific installation aspects.

If you use trac-0.9, read [http://lists.edgewall.com/archive/trac/2005-November/005311.html about small bug]

Relaunch lighttpd, and browse to `http://yourhost.example.org/trac` to access Trac.

----
See also TracCgi, TracModPython, TracInstall, TracGuide