Changes between Version 2 and Version 3 of TracFastCgi


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Timestamp:
Jan 13, 2012, 11:25:02 PM (13 years ago)
Author:
trac
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  • TracFastCgi

    v2 v3  
    11= Trac with FastCGI =
    22
    3 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.
    4 
    5 '''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].
     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].
    66
    77== Simple Apache configuration ==
    88
    99There are two FastCGI modules commonly available for Apache: `mod_fastcgi` and
    10 `mod_fcgid`.  The `FastCgiIpcDir` and `FastCgiConfig` directives discussed
    11 below are `mod_fastcgi` directives; the `DefaultInitEnv` is a `mod_fcgid`
    12 directive.
    13 
    14 For `mod_fastcgi`, add the following to an appropriate Apache configuration
    15 file:
     10`mod_fcgid` (preferred). The latter is more up-to-date.
     11
     12==== setup with `mod_fastcgi` ====
     13`mod_fastcgi` uses `FastCgiIpcDir` and `FastCgiConfig` directives that should be added to an appropriate Apache configuration file:
    1614{{{
    1715# Enable fastcgi for .fcgi files
    … …  
    3937}}}
    4038
    41 But neither of these will work for `mod_fcgid`.  A similar but partial
    42 solution for `mod_fcgid` is:
     39==== setup with `mod_fcgid` ====
     40Configure `ScriptAlias` (see TracCgi for details), but call `trac.fcgi`
     41instead of `trac.cgi`. Note that slash at the end - it is important.
     42{{{
     43ScriptAlias /trac /path/to/www/trac/cgi-bin/trac.fcgi/
     44}}}
     45
     46To 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
     49alternative environment setup below.
     50
    4351{{{
    4452DefaultInitEnv TRAC_ENV /path/to/env/trac/
    4553}}}
    46 But this cannot be used in `Directory` or `Location` context, which makes it
    47 difficult to support multiple projects.
    48 
    49 A better method which works for both of these modules (and for  [http://www.lighttpd.net/ lighttpd] and CGI as well), because it involves
    50 no server configuration settings for environment variables, is to set one
    51 of the variables in `trac.fcgi`, e.g.:
     54
     55==== alternative environment setup ====
     56A better method to specify path to Trac environment it to embed the path
     57into `trac.fcgi` script itself. That doesn't require configuration of server
     58environment variables, works for both FastCgi modules
     59(and for [http://www.lighttpd.net/ lighttpd] and CGI as well):
    5260{{{
    5361import os
    … …  
    6068}}}
    6169
    62 Using this method, different projects can be supported by using different
    63 `.fcgi` scripts with different `ScriptAliases`, copying and appropriately
    64 renaming `trac.fcgi` and adding the above code to create each such script.
     70With this method different projects can be supported by using different
     71`.fcgi` scripts with different `ScriptAliases`.
    6572
    6673See [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:
    … …  
    8895The 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/''
    8996
     97Note:\\
     98If 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.\\
     99Python-flup is a dependency which provides trac with SCGI capability. You can install it on debian based systems with:
     100{{{
     101sudo apt-get install python-flup
     102}}}
     103
    90104== Simple Lighttpd Configuration ==
    91105
    … …  
    97111For using `trac.fcgi`(prior to 0.11) / fcgi_frontend.py (0.11) with lighttpd add the following to your lighttpd.conf:
    98112{{{
    99 #var.fcgi_binary="/path/to/fcgi_frontend.py" # 0.11 if installed with easy_setup, it is inside the egg directory
     113#var.fcgi_binary="/usr/bin/python /path/to/fcgi_frontend.py" # 0.11 if installed with easy_setup, it is inside the egg directory
    100114var.fcgi_binary="/path/to/cgi-bin/trac.fcgi" # 0.10 name of prior fcgi executable
    101115fastcgi.server = ("/trac" =>
    … …  
    115129and you may set one of the two in `trac.fcgi` instead of in `lighttpd.conf`
    116130using `bin-environment` (as in the section above on Apache configuration).
     131
     132Note 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.
    117133
    118134For using two projects with lighttpd add the following to your `lighttpd.conf`:
    … …  
    268284Note about running lighttpd with reduced permissions:
    269285
    270   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.
     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.
    271287
    272288
    … …  
    277293!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.
    278294
    279 Setup
    280 
    281 1) Please make sure you have first have a working install of a Trac project. Test install with “tracd” first.
    282 
    283 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:
     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:
    284300
    285301{{{
    … …  
    287303}}}
    288304
    289 3) Go “TracVhost → External Apps” tab and create a new “External Application”.
     305 3. Go “!TracVhost → External Apps” tab and create a new “External Application”.
    290306
    291307{{{
    … …  
    305321}}}
    306322
    307 4) Optional. If you need to use htpasswd based authentication. Go to “TracVhost → Security” tab and create a new security “Realm”.
     323 4. Optional. If you need to use htpasswd based authentication. Go to “!TracVhost → Security” tab and create a new security “Realm”.
    308324
    309325{{{
    … …  
    315331If 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.
    316332
    317 5) Go to “PythonVhost → Contexts” and create a new “FCGI Context”.
     333 5. Go to “!PythonVhost → Contexts” and create a new “FCGI Context”.
    318334
    319335{{{
    … …  
    323339}}}
    324340
    325 6) Modify /fullpathto/mytracproject/conf/trac.ini
     341 6. Modify `/fullpathto/mytracproject/conf/trac.ini`
    326342
    327343{{{
    … …  
    332348}}}
    333349
    334 7) Restart !LiteSpeed, “lswsctrl restart”, and access your new Trac project at:
     350 7. Restart !LiteSpeed, “lswsctrl restart”, and access your new Trac project at:
    335351
    336352{{{
    … …  
    338354}}}
    339355
    340 === Simple Nginx Configuration ===
    341 
    342 1) Nginx configuration snippet - confirmed to work on 0.6.32
     356== Simple Nginx Configuration ==
     357
     358 1. Nginx configuration snippet - confirmed to work on 0.6.32
    343359{{{
    344360    server {
    … …  
    387403            fastcgi_param  SERVER_PORT        $server_port;
    388404            fastcgi_param  SERVER_PROTOCOL    $server_protocol;
     405            fastcgi_param  QUERY_STRING     $query_string;
    389406
    390407            # for authentication to work
    … …  
    395412}}}
    396413
    397 2) Modified trac.fcgi:
     414 2. Modified trac.fcgi:
    398415
    399416{{{
    … …  
    429446}}}
    430447
    431 3) reload nginx and launch trac.fcgi like that:
     448 3. reload nginx and launch trac.fcgi like that:
    432449
    433450{{{
    … …  
    437454The above assumes that:
    438455 * There is a user named 'trac' for running trac instances and keeping trac environments in its home directory.
    439  * /home/trac/instance contains a trac environment
    440  * /home/trac/htpasswd contains authentication information
    441  * /home/trac/run is owned by the same group the nginx runs under
    442   * and if your system is Linux the /home/trac/run has setgid bit set (chmod g+s run)
     456 * `/home/trac/instance` contains a trac environment
     457 * `/home/trac/htpasswd` contains authentication information
     458 * `/home/trac/run` is owned by the same group the nginx runs under
     459  * and if your system is Linux the `/home/trac/run` has setgid bit set (`chmod g+s run`)
    443460  * and patch from ticket #T7239 is applied, or you'll have to fix the socket file permissions every time
    444461