Changes between Version 2 and Version 3 of TracFastCgi


Ignore:
Timestamp:
Feb 16, 2019, 9:02:35 AM (6 years ago)
Author:
trac
Comment:

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  • TracFastCgi

    v2 v3  
    1 = Trac with FastCGI =
    2 
    3 [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.
    4 
    5 '''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].
    6 
    7 == Simple Apache configuration ==
    8 
    9 There are two FastCGI modules commonly available for Apache: `mod_fastcgi` and
    10 `mod_fcgid` (preferred). The latter is more up-to-date.
    11 
    12 ==== setup with `mod_fastcgi` ====
     1= Trac with FastCGI
     2
     3[[TracGuideToc]]
     4[[PageOutline(2-5, Contents, floated)]]
     5
     6[http://www.fastcgi.com/ FastCGI] interface allows Trac to remain resident much like with [wiki:TracModPython mod_python] or [wiki:TracModWSGI mod_wsgi]. It is faster than external CGI interfaces which must start a new process for each request. Additionally, it is supported by a much wider variety of web servers.
     7
     8Note that unlike mod_python, FastCGI supports [http://httpd.apache.org/docs/suexec.html Apache SuEXEC], ie run with different permissions than the web server runs with. `mod_wsgi` supports the `WSGIDaemonProcess` with user / group parameters to achieve the same effect.
     9
     10'''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]/[trac:TracOnWindowsIisAjp ISAPI].
     11
     12== Apache configuration
     13
     14There are two FastCGI modules commonly available for Apache: `mod_fastcgi` and `mod_fcgid` (preferred). The latter is more up-to-date.
     15
     16The following sections focus on the FCGI specific setup, see also [wiki:TracModWSGI#ConfiguringAuthentication] for configuring the authentication in Apache.
     17
     18Regardless of which cgi module is used, be sure the web server has executable permissions on the cgi-bin folder. While FastCGI will throw specific permissions errors, mod_fcgid will throw an ambiguous error if this has not been done: `Connection reset by peer: mod_fcgid: error reading data from FastCGI server`.
     19
     20=== Set up with `mod_fastcgi`
     21
    1322`mod_fastcgi` uses `FastCgiIpcDir` and `FastCgiConfig` directives that should be added to an appropriate Apache configuration file:
    14 {{{
     23{{{#!apache
    1524# Enable fastcgi for .fcgi files
    1625# (If you're using a distro package for mod_fcgi, something like
    … …  
    2231LoadModule fastcgi_module /usr/lib/apache2/modules/mod_fastcgi.so
    2332}}}
     33
    2434Setting `FastCgiIpcDir` is optional if the default is suitable. Note that the `LoadModule` line must be after the `IfModule` group.
    2535
    26 Configure `ScriptAlias` or similar options as described in TracCgi, but
    27 calling `trac.fcgi` instead of `trac.cgi`.
    28 
    29 You can set up the `TRAC_ENV` as an overall default:
    30 {{{
     36Configure `ScriptAlias` or similar options as described in TracCgi, but calling `trac.fcgi` instead of `trac.cgi`.
     37
     38Add the following to the Apache configuration file (below the `FastCgiIpcDir` line) if you intend to set up the `TRAC_ENV` as an overall default:
     39{{{#!apache
    3140FastCgiConfig -initial-env TRAC_ENV=/path/to/env/trac
    3241}}}
    3342
    34 Or you can serve multiple Trac projects in a directory like:
    35 {{{
     43Alternatively, you can serve multiple Trac projects in a directory by adding this:
     44{{{#!apache
    3645FastCgiConfig -initial-env TRAC_ENV_PARENT_DIR=/parent/dir/of/projects
    3746}}}
    3847
    39 ==== setup with `mod_fcgid` ====
    40 Configure `ScriptAlias` (see TracCgi for details), but call `trac.fcgi`
    41 instead of `trac.cgi`. Note that slash at the end - it is important.
    42 {{{
     48You can also specify the `PYTHON_EGG_CACHE` environment variable using a second `-initial-env` directive:
     49{{{#!apache
     50FastCgiConfig -initial-env TRAC_ENV=/var/lib/trac \
     51    -initial-env PYTHON_EGG_CACHE=/var/lib/trac/plugin-cache
     52}}}
     53
     54=== Set up with `mod_fcgid`
     55
     56Configure `ScriptAlias` (see TracCgi for details), but call `trac.fcgi` instead of `trac.cgi`:
     57{{{#!apache
    4358ScriptAlias /trac /path/to/www/trac/cgi-bin/trac.fcgi/
    4459}}}
    4560
    46 To setup Trac environment for `mod_fcgid` it is necessary to use
    47 `DefaultInitEnv` directive. It cannot be used in `Directory` or
    48 `Location` context, so if you need to support multiple projects, try
    49 alternative environment setup below.
    50 
    51 {{{
     61Note the slash at the end.
     62
     63To set up 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 the alternative environment setup below:
     64{{{#!apache
    5265DefaultInitEnv TRAC_ENV /path/to/env/trac/
    5366}}}
    5467
    55 ==== alternative environment setup ====
    56 A better method to specify path to Trac environment it to embed the path
    57 into `trac.fcgi` script itself. That doesn't require configuration of server
    58 environment variables, works for both FastCgi modules
    59 (and for [http://www.lighttpd.net/ lighttpd] and CGI as well):
    60 {{{
     68=== Alternative environment setup
     69
     70A better method to specify the path to the Trac environment is to embed the path into `trac.fcgi` script itself. That doesn't require configuration of the server environment variables, works for both [trac:FastCgi] modules as well as for [http://www.lighttpd.net/ lighttpd] and CGI:
     71{{{#!python
    6172import os
    6273os.environ['TRAC_ENV'] = "/path/to/projectenv"
    6374}}}
    64 or
    65 {{{
     75
     76or:
     77{{{#!python
    6678import os
    6779os.environ['TRAC_ENV_PARENT_DIR'] = "/path/to/project/parent/dir"
    6880}}}
    6981
    70 With this method different projects can be supported by using different
    71 `.fcgi` scripts with different `ScriptAliases`.
     82With this method different projects can be supported by using different `.fcgi` scripts with different `ScriptAliases`.
    7283
    7384See [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:
    74 {{{
     85{{{#!apache
    7586ScriptAlias / /srv/tracsite/cgi-bin/trac.fcgi/
    7687}}}
    7788
    78 == Simple Cherokee Configuration ==
    79 
    80 The configuration on Cherokee's side is quite simple. You will only need to know that you can spawn Trac as an SCGI process.
    81 You can either start it manually, or better yet, automatically by letting Cherokee spawn the server whenever it is down.
    82 First set up an information source in cherokee-admin with a local interpreter.
     89== Cherokee Configuration
     90
     91Configuring [http://cherokee-project.com/ Cherokee] with Trac is straightforward, if you spawn Trac as an SCGI process. You can either start it manually, or better yet, automatically by letting Cherokee spawn the server whenever it is down.
     92
     93First set up an information source in cherokee-admin with a local interpreter:
    8394
    8495{{{
    … …  
    93104
    94105After doing this, we will just have to create a new rule managed by the SCGI handler to access Trac. It can be created in a new virtual server, trac.example.net for instance, and will only need two rules. The '''default''' one will use the SCGI handler associated to the previously created information source.
    95 The second rule will be there to serve the few static files needed to correctly display the Trac interface. Create it as ''Directory rule'' for ''/chrome/common'' and just set it to the ''Static files'' handler and with a ''Document root'' that points to the appropriate files: ''/usr/share/trac/htdocs/''
    96 
    97 Note:\\
    98 If the tracd process fails to start up, and cherokee displays a 503 error page, you might be missing the [http://trac.saddi.com/flup python-flup] package.\\
    99 Python-flup is a dependency which provides trac with SCGI capability. You can install it on debian based systems with:
    100 {{{
     106The second rule will be there to serve the few static files needed to correctly display the Trac interface. Create it as ''Directory rule'' for ''/common'' and just set it to the ''Static files'' handler and with a ''Document root'' that points to the appropriate files: ''$TRAC_LOCAL/htdocs/'' (where $TRAC_LOCAL is a directory defined by the user or the system administrator to place local Trac resources).
     107
     108'''Note:''' If the tracd process fails to start up, and Cherokee displays a 503 error page, you might be missing the [http://trac.saddi.com/flup python-flup] package ([trac:#9903]). Python-flup is a dependency which provides Trac with SCGI capability. You can install it on Debian based systems with:
     109{{{#!sh
    101110sudo apt-get install python-flup
    102111}}}
    103112
    104 == Simple Lighttpd Configuration ==
    105 
    106 The FastCGI front-end was developed primarily for use with alternative webservers, such as [http://www.lighttpd.net/ lighttpd].
    107 
    108 lighttpd is a secure, fast, compliant and very flexible web-server that has been optimized for high-performance
    109 environments.  It has a very low memory footprint compared to other web servers and takes care of CPU load.
    110 
    111 For using `trac.fcgi`(prior to 0.11) / fcgi_frontend.py (0.11) with lighttpd add the following to your lighttpd.conf:
     113== Lighttpd Configuration
     114
     115The FastCGI front-end was developed primarily for use with alternative webservers, such as [http://www.lighttpd.net/ Lighttpd].
     116
     117Lighttpd 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.
     118
     119For using `trac.fcgi`(prior to 0.11) / fcgi_frontend.py (0.11) with Lighttpd add the following to your lighttpd.conf:
    112120{{{
    113121#var.fcgi_binary="/usr/bin/python /path/to/fcgi_frontend.py" # 0.11 if installed with easy_setup, it is inside the egg directory
    … …  
    126134}}}
    127135
    128 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,
    129 and you may set one of the two in `trac.fcgi` instead of in `lighttpd.conf`
    130 using `bin-environment` (as in the section above on Apache configuration).
    131 
    132 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.
     136Note 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.
     137
     138Note 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 [trac:#2418]). This is fixed in Lighttpd 1.5, and under Lighttpd 1.4.23 or later the workaround is to add `"fix-root-scriptname" => "enable"` as a parameter of fastcgi.server.
    133139
    134140For using two projects with lighttpd add the following to your `lighttpd.conf`:
    … …  
    154160                )
    155161}}}
    156 Note that field values are different.  If you prefer setting the environment
    157 variables in the `.fcgi` scripts, then copy/rename `trac.fcgi`, e.g., to
    158 `first.fcgi` and `second.fcgi`, and reference them in the above settings.
    159 Note that the above will result in different processes in any event, even
    160 if both are running from the same `trac.fcgi` script.
    161 {{{
    162 #!div class=important
    163 '''Note''' 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.
    164 }}}
     162
     163Note that the field values are different. If you prefer setting the environment variables in the `.fcgi` scripts, then copy/rename `trac.fcgi`, eg to `first.fcgi` and `second.fcgi`, and reference them in the above settings.
     164Note that the above will result in different processes in any event, even if both are running from the same `trac.fcgi` script.
     165
     166{{{#!div class=important
     167'''Note:''' The order in which the server.modules are loaded is very important: if mod_auth is not loaded '''before''' mod_fastcgi, then the server will fail to authenticate the user.
     168}}}
     169
    165170For authentication you should enable mod_auth in lighttpd.conf 'server.modules', select auth.backend and auth rules:
    166171{{{
    … …  
    199204               )
    200205
    201 
    202 }}}
    203 Note that lighttpd (I use version 1.4.3) stopped if password file doesn't exist.
    204 
    205 Note that lighttpd doesn't support 'valid-user' in versions prior to 1.3.16.
    206 
    207 Conditional configuration is also useful for mapping static resources, i.e. serving out images and CSS directly instead of through FastCGI:
     206}}}
     207
     208Note that Lighttpd (v1.4.3) stops if the password file doesn't exist.
     209
     210Note that Lighttpd doesn't support 'valid-user' in versions prior to 1.3.16.
     211
     212Conditional configuration is also useful for mapping static resources, ie serving out images and CSS directly instead of through FastCGI:
    208213{{{
    209214# Aliasing functionality is needed
    210215server.modules += ("mod_alias")
    211216
    212 # Setup an alias for the static resources
     217# Set up an alias for the static resources
    213218alias.url = ("/trac/chrome/common" => "/usr/share/trac/htdocs")
    214219
    … …  
    229234}
    230235}}}
     236
    231237The 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.
    232 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:
     238
     239Also there is another way to handle multiple projects and it uses `TRAC_ENV_PARENT_DIR` instead of `TRAC_ENV` as well as global authentication:
    233240{{{
    234241#  This is for handling multiple projects
    … …  
    260267}}}
    261268
    262 Changing date/time format also supported by lighttpd over environment variable LC_TIME
     269Changing date/time format also supported by lighttpd over environment variable LC_TIME:
    263270{{{
    264271fastcgi.server = ("/trac" =>
    … …  
    274281                 )
    275282}}}
     283
    276284For details about languages specification see [trac:TracFaq TracFaq] question 2.13.
    277285
    278 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.
    279 
    280 If you use trac-0.9, read [http://lists.edgewall.com/archive/trac/2005-November/005311.html about small bug]
    281 
    282 Relaunch lighttpd, and browse to `http://yourhost.example.org/trac` to access Trac.
    283 
    284 Note about running lighttpd with reduced permissions:
    285 
    286   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.
    287 
    288 
    289 == Simple !LiteSpeed Configuration ==
     286Other important information like the [wiki:TracInstall#MappingStaticResources mapping static resources advices] are useful for non-fastcgi specific installation aspects.
     287
     288Relaunch Lighttpd and browse to `http://yourhost.example.org/trac` to access Trac.
     289
     290Note 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.
     291
     292== !LiteSpeed Configuration
    290293
    291294The FastCGI front-end was developed primarily for use with alternative webservers, such as [http://www.litespeedtech.com/ LiteSpeed].
    … …  
    293296!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.
    294297
    295 === Setup ===
    296 
    297  1. Please make sure you have first have a working install of a Trac project. Test install with “tracd” first.
    298 
    299  2. 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:
    300 
     298 1. Please make sure you have a working install of a Trac project. Test install with "tracd" first.
     299 1. 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:
    301300{{{
    302301http://yourdomain.com/trac/
    303302}}}
    304 
    305  3. Go “!TracVhost → External Apps” tab and create a new “External Application”.
    306 
     303 1. Go "!TracVhost → External Apps" tab and create a new "External Application":
    307304{{{
    308305Name: MyTracFCGI       
    … …  
    320317Instances: 10
    321318}}}
    322 
    323  4. Optional. If you need to use htpasswd based authentication. Go to “!TracVhost → Security” tab and create a new security “Realm”.
    324 
    325 {{{
     319 1. Optional: If you need to use htpasswd based authentication. Go to "!TracVhost → Security" tab and create a new security Realm:
     320 {{{
    326321DB Type: Password File
    327322Realm Name: MyTracUserDB               <--- any name you wish and referenced later
    328323User DB Location: /fullpathto/htpasswd <--- path to your htpasswd file
    329324}}}
    330 
    331 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.
    332 
    333  5. Go to “!PythonVhost → Contexts” and create a new “FCGI Context”.
    334 
    335 {{{
     325 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.
     326 1. Go to "!PythonVhost → Contexts" and create a new FCGI Context:
     327 {{{
    336328URI: /trac/                              <--- URI path to bind to python fcgi app we created   
    337 Fast CGI App: [VHost Level] MyTractFCGI  <--- select the trac fcgi extapp we just created
     329Fast CGI App: [VHost Level] MyTractFCGI  <--- select the Trac fcgi extapp we just created
    338330Realm: TracUserDB                        <--- only if (4) is set. select realm created in (4)
    339331}}}
    340 
    341  6. Modify `/fullpathto/mytracproject/conf/trac.ini`
    342 
    343 {{{
     332 1. Modify `/fullpathto/mytracproject/conf/trac.ini`:
     333 {{{
    344334#find/set base_rul, url, and link variables
    345335base_url = http://yourdomain.com/trac/ <--- base url to generate correct links to
    … …  
    347337link = http://yourdomain.com/trac/     <--- link of graphic logo
    348338}}}
    349 
    350  7. Restart !LiteSpeed, “lswsctrl restart”, and access your new Trac project at:
    351 
    352 {{{
    353 http://yourdomain.com/trac/
    354 }}}
    355 
    356 == Simple Nginx Configuration ==
    357 
    358  1. Nginx configuration snippet - confirmed to work on 0.6.32
    359 {{{
     339 1. Restart !LiteSpeed: `lswsctrl restart`, and access your new Trac project at {{{http://yourdomain.com/trac/}}}.
     340
     341== Nginx Configuration
     342
     343[http://nginx.org/en/ Nginx] is able to communicate with FastCGI processes, but can not spawn them. So you need to start FastCGI server for Trac separately.
     344
     345 1. Nginx configuration with basic authentication handled by Nginx - confirmed to work on 0.6.32
     346 {{{#!nginx
    360347    server {
    361348        listen       10.9.8.7:443;
    … …  
    372359        ssl_prefer_server_ciphers   on;
    373360
    374         # (Or ``^/some/prefix/(.*)``.
    375         if ($uri ~ ^/(.*)) {
    376              set $path_info /$1;
     361        # it makes sense to serve static resources through Nginx (or ``~ [/some/prefix]/chrome/(.*)``)
     362        location ~ /chrome/(.*) {
     363             alias /home/trac/instance/static/htdocs/$1;
    377364        }
    378365
    379         # You can copy this whole location to ``location [/some/prefix]/login``
     366        # You can copy this whole location to ``location [/some/prefix](/login)``
    380367        # and remove the auth entries below if you want Trac to enforce
    381368        # authorization where appropriate instead of needing to authenticate
    382369        # for accessing the whole site.
    383         # (Or ``location /some/prefix``.)
    384         location / {
     370        # (Or ``~ location /some/prefix(/.*)``.)
     371        location ~ (/.*) {
    385372            auth_basic            "trac realm";
    386373            auth_basic_user_file /home/trac/htpasswd;
    … …  
    396383            # (Or ``fastcgi_param  SCRIPT_NAME  /some/prefix``.)
    397384            fastcgi_param  SCRIPT_NAME        "";
    398             fastcgi_param  PATH_INFO          $path_info;
     385            fastcgi_param  PATH_INFO          $1;
    399386
    400387            ## WSGI NEEDED VARIABLES - trac warns about them
    … …  
    403390            fastcgi_param  SERVER_PORT        $server_port;
    404391            fastcgi_param  SERVER_PROTOCOL    $server_protocol;
    405             fastcgi_param  QUERY_STRING     $query_string;
    406 
    407             # for authentication to work
     392            fastcgi_param  QUERY_STRING       $query_string;
     393
     394            # For Nginx authentication to work - do not forget to comment these
     395            # lines if not using Nginx for authentication
    408396            fastcgi_param  AUTH_USER          $remote_user;
    409397            fastcgi_param  REMOTE_USER        $remote_user;
     398
     399            # for ip to work
     400            fastcgi_param REMOTE_ADDR         $remote_addr;
     401
     402            # For attchments to work
     403            fastcgi_param    CONTENT_TYPE     $content_type;
     404            fastcgi_param    CONTENT_LENGTH   $content_length;
    410405        }
    411406    }
    412407}}}
    413 
    414  2. Modified trac.fcgi:
    415 
    416 {{{
     408 1. Modified trac.fcgi:
     409 {{{#!python
    417410#!/usr/bin/env python
    418411import os
    … …  
    445438
    446439}}}
    447 
    448  3. reload nginx and launch trac.fcgi like that:
    449 
    450 {{{
     440 1. Reload nginx and launch trac.fcgi:
     441 {{{#!sh
    451442trac@trac.example ~ $ ./trac-standalone-fcgi.py
    452443}}}
    453444
    454445The above assumes that:
    455  * There is a user named 'trac' for running trac instances and keeping trac environments in its home directory.
    456  * `/home/trac/instance` contains a trac environment
     446 * There is a user named 'trac' for running Trac instances and keeping Trac environments in its home directory
     447 * `/home/trac/instance` contains a Trac environment
    457448 * `/home/trac/htpasswd` contains authentication information
    458  * `/home/trac/run` is owned by the same group the nginx runs under
     449 * `/home/trac/run` is owned by the same group the Nginx runs under
    459450  * and if your system is Linux the `/home/trac/run` has setgid bit set (`chmod g+s run`)
    460   * and patch from ticket #T7239 is applied, or you'll have to fix the socket file permissions every time
    461 
    462 Unfortunately nginx does not support variable expansion in fastcgi_pass directive.
    463 Thus it is not possible to serve multiple trac instances from one server block.
    464 
    465 If you worry enough about security, run trac instances under separate users.
    466 
    467 Another way to run trac as a FCGI external application is offered in ticket #T6224
     451  * and patch from [trac:#7239] is applied, or you'll have to fix the socket file permissions every time
     452
     453Unfortunately Nginx does not support variable expansion in fastcgi_pass directive.
     454Thus it is not possible to serve multiple Trac instances from one server block.
     455
     456If you worry enough about security, run Trac instances under separate users.
     457
     458Another way to run Trac as a FCGI external application is offered in [trac:#6224].
    468459
    469460----
    470 See also:  TracGuide, TracInstall, [wiki:TracModWSGI ModWSGI], [wiki:TracCgi CGI], [wiki:TracModPython ModPython], [trac:TracNginxRecipe TracNginxRecipe]
     461See also: TracGuide, TracInstall, [wiki:TracModWSGI ModWSGI], [wiki:TracCgi CGI], [wiki:TracModPython ModPython], [trac:TracNginxRecipe TracNginxRecipe]