Changes between Version 1 and Version 2 of TracFastCgi

Timestamp:: 2010-12-25 00:17:45 (13 years ago)
Author:: trac
Comment:: --

Legend:

: Unmodified
: Added
: Removed
: Modified

TracFastCgi

-                      v1
+                      v2
 = 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.
 '''Note for Windows:''' Trac's FCGI does not run under Windows, as Windows does not implement `Socket.fromfd`, which is used by `_fcgi.py`. If you want to connect to IIS, your choice may be [trac:TracOnWindowsIisAjp AJP].
+[http://www.fastcgi.com/ FastCGI] interface allows Trac to remain resident much like with [wiki:TracModPython mod_python]. It is faster than external CGI interfaces which must start a new process for each request. However, unlike mod_python, FastCGI supports [http://httpd.apache.org/docs/suexec.html Apache SuEXEC], i.e. run with different permissions than web server. Additionally, it is supported by much wider variety of web servers.
+'''Note for Windows:''' Trac's FastCGI does not run under Windows, as Windows does not implement `Socket.fromfd`, which is used by `_fcgi.py`. If you want to connect to IIS, you may want to try [trac:TracOnWindowsIisAjp AJP].
 == 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_fcgid`
+directive.
+For `mod_fastcgi`, add the following to an appropriate Apache configuration
+file:
+`mod_fcgid` (preferred). The latter is more up-to-date.
+==== setup with `mod_fastcgi` ====
+`mod_fastcgi` uses `FastCgiIpcDir` and `FastCgiConfig` directives that should be added to an appropriate Apache configuration file:
 {{{
 # Enable fastcgi for .fcgi files
 …
 }}}
+But neither of these will work for `mod_fcgid`.  A similar but partial
+solution for `mod_fcgid` is:
+==== setup with `mod_fcgid` ====
+Configure `ScriptAlias` (see TracCgi for details), but call `trac.fcgi`
+instead of `trac.cgi`. Note that slash at the end - it is important.
+{{{
+ScriptAlias /trac /path/to/www/trac/cgi-bin/trac.fcgi/
+}}}
+To setup Trac environment for `mod_fcgid` it is necessary to use
+`DefaultInitEnv` directive. It cannot be used in `Directory` or
+`Location` context, so if you need to support multiple projects, try
+alternative environment setup below.
 {{{
 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  [http://www.lighttpd.net/ 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.:
+==== alternative environment setup ====
+A better method to specify path to Trac environment it to embed the path
+into `trac.fcgi` script itself. That doesn't require configuration of server
+environment variables, works for both FastCgi modules
+(and for [http://www.lighttpd.net/ lighttpd] and CGI as well):
 {{{
 import os
 …
 }}}
+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.
+With this method different projects can be supported by using different
+`.fcgi` scripts with different `ScriptAliases`.
 See [https://coderanger.net/~coderanger/httpd/fcgi_example.conf this fcgid example config] which uses a !ScriptAlias directive with trac.fcgi with a trailing / like this:
 …
 For using `trac.fcgi`(prior to 0.11) / fcgi_frontend.py (0.11) with lighttpd add the following to your lighttpd.conf:
 {{{
 #var.fcgi_binary="/path/to/fcgi_frontend.py" # 0.11 if installed with easy_setup, it is inside the egg directory
+#var.fcgi_binary="/usr/bin/python /path/to/fcgi_frontend.py" # 0.11 if installed with easy_setup, it is inside the egg directory
 var.fcgi_binary="/path/to/cgi-bin/trac.fcgi" # 0.10 name of prior fcgi executable
 fastcgi.server = ("/trac" =>
 …
 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).
+Note that lighttpd has a bug related to 'SCRIPT_NAME' and 'PATH_INFO' when the uri of fastcgi.server is '/' instead of '/trac' in this example, see #Trac2418. This should be fixed since lighttpd 1.4.23, and you may need to add `"fix-root-scriptname" => "enable"` as parameter of fastcgi.server.
 For using two projects with lighttpd add the following to your `lighttpd.conf`:
 …
 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-environment` section set `PYTHON_EGG_CACHE` to the home directory of `www-data` or some other directory accessible to this account for writing.
+  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-environment` section set `PYTHON_EGG_CACHE` to the home directory of `www-data` or some other directory accessible to this account for writing.
 …
 !LiteSpeed web server is an event-driven asynchronous Apache replacement designed from the ground-up to be secure, scalable, and operate with minimal resources. !LiteSpeed can operate directly from an Apache config file and is targeted for business-critical environments.
+Setup
 ) Please make sure you have first have a working install of a Trac project. Test install with “tracd” first.
 ) Create a Virtual Host for this setup. From now on we will refer to this vhost as TracVhost. For this tutorial we will be assuming that your trac project will be accessible via:
+=== Setup ===
+. Please make sure you have first have a working install of a Trac project. Test install with “tracd” first.
+. Create a Virtual Host for this setup. From now on we will refer to this vhost as !TracVhost. For this tutorial we will be assuming that your trac project will be accessible via:
 {{{
 …
 }}}
 ) Go “TracVhost → External Apps” tab and create a new “External Application”.
+. Go “!TracVhost → External Apps” tab and create a new “External Application”.
 {{{
 …
 }}}
 ) Optional. If you need to use htpasswd based authentication. Go to “TracVhost → Security” tab and create a new security “Realm”.
+. Optional. If you need to use htpasswd based authentication. Go to “!TracVhost → Security” tab and create a new security “Realm”.
 {{{
 …
 If you don’t have a htpasswd file or don’t know how to create the entries within one, go to http://sherylcanter.com/encrypt.php, to generate the user:password combos.
 ) Go to “PythonVhost → Contexts” and create a new “FCGI Context”.
+. Go to “!PythonVhost → Contexts” and create a new “FCGI Context”.
 {{{
 …
 }}}
+) Modify /fullpathto/mytracproject/conf/trac.ini
+. Modify `/fullpathto/mytracproject/conf/trac.ini`
 {{{
 …
 }}}
 ) Restart !LiteSpeed, “lswsctrl restart”, and access your new Trac project at:
+. Restart !LiteSpeed, “lswsctrl restart”, and access your new Trac project at:
 {{{
 …
 }}}
 === Simple Nginx Configuration ===
 ) Nginx configuration snippet - confirmed to work on 0.6.32
+== Simple Nginx Configuration ==
+. Nginx configuration snippet - confirmed to work on 0.6.32
 {{{
     server {
 …
             fastcgi_param  SERVER_PORT        $server_port;
             fastcgi_param  SERVER_PROTOCOL    $server_protocol;
+            fastcgi_param  QUERY_STRING     $query_string;
             # for authentication to work
 …
 }}}
 ) Modified trac.fcgi:
+. Modified trac.fcgi:
 {{{
 …
 }}}
 ) reload nginx and launch trac.fcgi like that:
+. reload nginx and launch trac.fcgi like that:
 {{{
 …
 The above assumes that:
  * There is a user named 'trac' for running trac instances and keeping trac environments in its home directory.
  * /home/trac/instance contains a trac environment
  * /home/trac/htpasswd contains authentication information
  * /home/trac/run is owned by the same group the nginx runs under
   * and if your system is Linux the /home/trac/run has setgid bit set (chmod g+s run)
+ * `/home/trac/instance` contains a trac environment
+ * `/home/trac/htpasswd` contains authentication information
+ * `/home/trac/run` is owned by the same group the nginx runs under
+  * and if your system is Linux the `/home/trac/run` has setgid bit set (`chmod g+s run`)
   * and patch from ticket #T7239 is applied, or you'll have to fix the socket file permissions every time