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Trac with FastCGI
Since version 0.9, Trac supports being run through the FastCGI interface. Like 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 SuEXEC. Additionally, it is supported by much wider variety of web servers.
Simple Apache configuration
There are two FastCGI modules commonly available for Apache: mod_fastcgi and
mod_fcgid. The FastCgiIpcDir and FastCgiConfig directives discussed
below are mod_fastcgi directives; the DefaultInitEnv is a mod_fgcid
directive.
For mod_fastcgi, add the following to an appropriate Apache configuration
file:
# 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
Setting FastCgiIpcDir is optional if the default is suitable.
Configure ScriptAlias or similar options as described in TracCgi, but
calling trac.fcgi instead of trac.cgi.
You can set up 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
But neither of these will work for mod_fcgid. A similar but partial
solution for mod_fcgid is:
DefaultInitEnv TRAC_ENV /path/to/env/trac/
But this cannot be used in Directory or Location context, which makes it
difficult to support multiple projects.
A better method which works for both of these modules (and for lighttpd and CGI as well), because it involves
no server configuration settings for environment variables, is to set one
of the variables in trac.fcgi, e.g.:
import os os.environ['TRAC_ENV'] = "/path/to/projectenv"
or
import os os.environ['TRAC_ENV_PARENT_DIR'] = "/path/to/project/parent/dir"
Using this method, different projects can be supported by using different
.fcgi scripts with different ScriptAliases, copying and appropriately
renaming trac.fcgi and adding the above code to create each such script.
Simple Lighttpd Configuration
The FastCGI front-end was developed primarily for use with alternative webservers, such as 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,
and you may set one of the two in trac.fcgi instead of in lighttpd.conf
using bin-environment (as in the section above on Apache configuration).
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. If you prefer setting the environment
variables in the .fcgi scripts, then copy/rename trac.fcgi, e.g., to
first.fcgi and second.fcgi, and reference them in the above settings.
Note that the above will result in different processes in any event, even
if both are running from the same trac.fcgi script.
Note from c00i90wn: It's very important the order on which server.modules are loaded, if mod_auth is not loaded BEFORE mod_fastcgi, then the server will fail to authenticate the user.
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 2.13.
Other important information like this updated TracInstall page, and this are useful for non-fastcgi specific installation aspects.
If you use trac-0.9, read about small bug
Relaunch lighttpd, and browse to http://yourhost.example.org/trac to access Trac.
Note about running lighttpd with reduced permissions:
If nothing else helps and trac.fcgi doesn't start with lighttpd settings server.username = "www-data", server.groupname = "www-data", then in the
bin-environmentsection setPYTHON_EGG_CACHEto the home directory ofwww-dataor some other directory accessible to this account for writing.
See also TracCgi, TracModPython, TracInstall, TracGuide
