Changes between Version 2 and Version 3 of TracFastCgi


Ignore:
Timestamp:
02/28/11 14:16:41 (13 years ago)
Author:
trac
Comment:

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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:
    … …  
    7178== Simple Cherokee Configuration ==
    7279
    73 Configuration wanted.
     80The configuration on Cherokee's side is quite simple. You will only need to know that you can spawn Trac as an SCGI process.
     81You can either start it manually, or better yet, automatically by letting Cherokee spawn the server whenever it is down.
     82First set up an information source in cherokee-admin with a local interpreter.
     83
     84{{{
     85Host:
     86localhost:4433
     87
     88Interpreter:
     89/usr/bin/tracd —single-env —daemonize —protocol=scgi —hostname=localhost —port=4433 /path/to/project/
     90}}}
     91
     92If the port was not reachable, the interpreter command would be launched. Note that, in the definition of the information source, you will have to manually launch the spawner if you use a ''Remote host'' as ''Information source'' instead of a ''Local interpreter''.
     93
     94After 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.
     95The 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/''
    7496
    7597== Simple Lighttpd Configuration ==
    … …  
    82104For using `trac.fcgi`(prior to 0.11) / fcgi_frontend.py (0.11) with lighttpd add the following to your lighttpd.conf:
    83105{{{
    84 #var.fcgi_binary="/path/to/fcgi_frontend.py" # 0.11 if installed with easy_setup, it is inside the egg directory
     106#var.fcgi_binary="/usr/bin/python /path/to/fcgi_frontend.py" # 0.11 if installed with easy_setup, it is inside the egg directory
    85107var.fcgi_binary="/path/to/cgi-bin/trac.fcgi" # 0.10 name of prior fcgi executable
    86108fastcgi.server = ("/trac" =>
    … …  
    100122and you may set one of the two in `trac.fcgi` instead of in `lighttpd.conf`
    101123using `bin-environment` (as in the section above on Apache configuration).
     124
     125Note 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.
    102126
    103127For using two projects with lighttpd add the following to your `lighttpd.conf`:
    … …  
    253277Note about running lighttpd with reduced permissions:
    254278
    255   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.
     279  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.
    256280
    257281
    … …  
    262286!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.
    263287
    264 Setup
    265 
    266 1) Please make sure you have first have a working install of a Trac project. Test install with “tracd” first.
    267 
    268 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:
     288=== Setup ===
     289
     290 1. Please make sure you have first have a working install of a Trac project. Test install with “tracd” first.
     291
     292 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:
    269293
    270294{{{
    … …  
    272296}}}
    273297
    274 3) Go “TracVhost → External Apps” tab and create a new “External Application”.
     298 3. Go “!TracVhost → External Apps” tab and create a new “External Application”.
    275299
    276300{{{
    … …  
    290314}}}
    291315
    292 4) Optional. If you need to use htpasswd based authentication. Go to “TracVhost → Security” tab and create a new security “Realm”.
     316 4. Optional. If you need to use htpasswd based authentication. Go to “!TracVhost → Security” tab and create a new security “Realm”.
    293317
    294318{{{
    … …  
    300324If 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.
    301325
    302 5) Go to “PythonVhost → Contexts” and create a new “FCGI Context”.
     326 5. Go to “!PythonVhost → Contexts” and create a new “FCGI Context”.
    303327
    304328{{{
    … …  
    308332}}}
    309333
    310 6) Modify /fullpathto/mytracproject/conf/trac.ini
     334 6. Modify `/fullpathto/mytracproject/conf/trac.ini`
    311335
    312336{{{
    … …  
    317341}}}
    318342
    319 7) Restart !LiteSpeed, “lswsctrl restart”, and access your new Trac project at:
     343 7. Restart !LiteSpeed, “lswsctrl restart”, and access your new Trac project at:
    320344
    321345{{{
    … …  
    323347}}}
    324348
    325 === Simple Nginx Configuration ===
    326 
    327 1) Nginx configuration snippet - confirmed to work on 0.5.36
     349== Simple Nginx Configuration ==
     350
     351 1. Nginx configuration snippet - confirmed to work on 0.6.32
    328352{{{
    329353    server {
    … …  
    341365        ssl_prefer_server_ciphers   on;
    342366
     367        # (Or ``^/some/prefix/(.*)``.
     368        if ($uri ~ ^/(.*)) {
     369             set $path_info /$1;
     370        }
     371
     372        # You can copy this whole location to ``location [/some/prefix]/login``
     373        # and remove the auth entries below if you want Trac to enforce
     374        # authorization where appropriate instead of needing to authenticate
     375        # for accessing the whole site.
     376        # (Or ``location /some/prefix``.)
    343377        location / {
    344378            auth_basic            "trac realm";
    345379            auth_basic_user_file /home/trac/htpasswd;
    346380
    347             # full path
    348             if ($uri ~ ^/([^/]+)(/.*)) {
    349                  set $script_name $1;
    350                  set $path_info $2;
    351             }
    352 
    353             # index redirect
    354             if ($uri ~ ^/([^/]+)$) {
    355                  rewrite (.+) $1/ permanent;
    356             }
    357          
    358381            # socket address
    359382            fastcgi_pass   unix:/home/trac/run/instance.sock;
    … …  
    363386
    364387            ## WSGI REQUIRED VARIABLES
    365             # WSGI application name - trac instance prefix.
    366             fastcgi_param  SCRIPT_NAME        /$script_name;
     388            # WSGI application name - trac instance prefix.
     389            # (Or ``fastcgi_param  SCRIPT_NAME  /some/prefix``.)
     390            fastcgi_param  SCRIPT_NAME        "";
    367391            fastcgi_param  PATH_INFO          $path_info;
    368392
    … …  
    372396            fastcgi_param  SERVER_PORT        $server_port;
    373397            fastcgi_param  SERVER_PROTOCOL    $server_protocol;
     398            fastcgi_param  QUERY_STRING     $query_string;
    374399
    375400            # for authentication to work
     401            fastcgi_param  AUTH_USER          $remote_user;
    376402            fastcgi_param  REMOTE_USER        $remote_user;
    377403        }
    … …  
    379405}}}
    380406
    381 2) Modified trac.fcgi:
     407 2. Modified trac.fcgi:
    382408
    383409{{{
    … …  
    413439}}}
    414440
    415 3) reload nginx and launch trac.fcgi like that:
     441 3. reload nginx and launch trac.fcgi like that:
    416442
    417443{{{
    … …  
    421447The above assumes that:
    422448 * There is a user named 'trac' for running trac instances and keeping trac environments in its home directory.
    423  * /home/trac/instance contains a trac environment
    424  * /home/trac/htpasswd contains authentication information
    425  * /home/trac/run is owned by the same group the nginx runs under
    426   * and if your system is Linux the /home/trac/run has setgid bit set (chmod g+s run)
     449 * `/home/trac/instance` contains a trac environment
     450 * `/home/trac/htpasswd` contains authentication information
     451 * `/home/trac/run` is owned by the same group the nginx runs under
     452  * and if your system is Linux the `/home/trac/run` has setgid bit set (`chmod g+s run`)
    427453  * and patch from ticket #T7239 is applied, or you'll have to fix the socket file permissions every time
    428454
    … …  
    435461
    436462----
    437 See also TracCgi, TracModPython, TracInstall, TracGuide, [trac:TracNginxRecipe TracNginxRecipe]
     463See also:  TracGuide, TracInstall, [wiki:TracModWSGI ModWSGI], [wiki:TracCgi CGI], [wiki:TracModPython ModPython], [trac:TracNginxRecipe TracNginxRecipe]