Changes between Version 4 and Version 5 of Trac Fast Cgi


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Timestamp:
Apr 12, 2015, 9:30:13 PM (10 years ago)
Author:
trac
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  • Trac Fast Cgi

    v4 v5  
    1 = Trac with FastCGI =
     1= Trac with FastCGI
     2
    23[[TracGuideToc]]
    34[[PageOutline(2-5, Contents, floated)]]
    … …  
    56[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 much wider variety of web servers.
    67
    7 Note that unlike mod_python, FastCGI supports [http://httpd.apache.org/docs/suexec.html Apache SuEXEC], i.e. run with different permissions than web server running with (`mod_wsgi` supports the `WSGIDaemonProcess` with user / group parameters to achieve the same effect).
     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.
    89
    910'''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].
    1011
    11 [[PageOutline(2-3,Overview,inline)]]
    12 
    13 
    14 == Simple Apache configuration ==
     12== Simple Apache configuration
    1513
    1614There are two FastCGI modules commonly available for Apache: `mod_fastcgi` and
    … …  
    1917The following sections focus on the FCGI specific setup, see also [wiki:TracModWSGI#ConfiguringAuthentication] for configuring the authentication in Apache.
    2018
    21 Regardless 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)
    22 
    23 === Set up with `mod_fastcgi` ===
     19Regardless 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.
     20
     21=== Set up with `mod_fastcgi`
     22
    2423`mod_fastcgi` uses `FastCgiIpcDir` and `FastCgiConfig` directives that should be added to an appropriate Apache configuration file:
    2524{{{
    … …  
    4847}}}
    4948
    50 === Set up with `mod_fcgid` ===
    51 Configure `ScriptAlias` (see TracCgi for details), but call `trac.fcgi`
    52 instead of `trac.cgi`. Note that slash at the end - it is important.
     49=== Set up with `mod_fcgid`
     50
     51Configure `ScriptAlias` (see TracCgi for details), but call `trac.fcgi` instead of `trac.cgi`:
    5352{{{
    5453ScriptAlias /trac /path/to/www/trac/cgi-bin/trac.fcgi/
    5554}}}
    56 
    57 To set up Trac environment for `mod_fcgid` it is necessary to use
    58 `DefaultInitEnv` directive. It cannot be used in `Directory` or
    59 `Location` context, so if you need to support multiple projects, try
    60 alternative environment setup below.
     55Note the slash at the end.
     56
     57To 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 alternative environment setup below.
    6158
    6259{{{
    … …  
    6461}}}
    6562
    66 === alternative environment setup ===
    67 A better method to specify path to Trac environment is to embed the path
    68 into `trac.fcgi` script itself. That doesn't require configuration of server
    69 environment variables, works for both FastCgi modules
    70 (and for [http://www.lighttpd.net/ lighttpd] and CGI as well):
     63=== alternative environment setup
     64
     65A better method to specify 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:
    7166{{{
    7267import os
    7368os.environ['TRAC_ENV'] = "/path/to/projectenv"
    7469}}}
    75 or
     70or:
    7671{{{
    7772import os
    … …  
    7974}}}
    8075
    81 With this method different projects can be supported by using different
    82 `.fcgi` scripts with different `ScriptAliases`.
     76With this method different projects can be supported by using different `.fcgi` scripts with different `ScriptAliases`.
    8377
    8478See [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:
    … …  
    8781}}}
    8882
    89 == Simple Cherokee Configuration ==
     83== Simple Cherokee Configuration
    9084
    9185The configuration on Cherokee's side is quite simple. You will only need to know that you can spawn Trac as an SCGI process.
    9286You can either start it manually, or better yet, automatically by letting Cherokee spawn the server whenever it is down.
    93 First set up an information source in cherokee-admin with a local interpreter.
     87First set up an information source in cherokee-admin with a local interpreter:
    9488
    9589{{{
    … …  
    113107}}}
    114108
    115 
    116 == Simple Lighttpd Configuration ==
    117 
    118 The FastCGI front-end was developed primarily for use with alternative webservers, such as [http://www.lighttpd.net/ lighttpd].
    119 
    120 lighttpd is a secure, fast, compliant and very flexible web-server that has been optimized for high-performance
    121 environments.  It has a very low memory footprint compared to other web servers and takes care of CPU load.
    122 
    123 For using `trac.fcgi`(prior to 0.11) / fcgi_frontend.py (0.11) with lighttpd add the following to your lighttpd.conf:
     109== Simple Lighttpd Configuration
     110
     111The FastCGI front-end was developed primarily for use with alternative webservers, such as [http://www.lighttpd.net/ Lighttpd].
     112
     113Lighttpd 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.
     114
     115For using `trac.fcgi`(prior to 0.11) / fcgi_frontend.py (0.11) with Lighttpd add the following to your lighttpd.conf:
    124116{{{
    125117#var.fcgi_binary="/usr/bin/python /path/to/fcgi_frontend.py" # 0.11 if installed with easy_setup, it is inside the egg directory
    … …  
    138130}}}
    139131
    140 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,
    141 and you may set one of the two in `trac.fcgi` instead of in `lighttpd.conf`
    142 using `bin-environment` (as in the section above on Apache configuration).
    143 
    144 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 [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.
     132Note 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.
     133
     134Note 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.
    145135
    146136For using two projects with lighttpd add the following to your `lighttpd.conf`:
    … …  
    166156                )
    167157}}}
    168 Note that field values are different.  If you prefer setting the environment
    169 variables in the `.fcgi` scripts, then copy/rename `trac.fcgi`, e.g., to
    170 `first.fcgi` and `second.fcgi`, and reference them in the above settings.
    171 Note that the above will result in different processes in any event, even
    172 if both are running from the same `trac.fcgi` script.
     158
     159Note that 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.
     160Note that the above will result in different processes in any event, even if both are running from the same `trac.fcgi` script.
    173161
    174162{{{
    … …  
    213201               )
    214202
    215 
    216 }}}
    217 Note that lighttpd (I use version 1.4.3) stopped if password file doesn't exist.
    218 
    219 Note that lighttpd doesn't support 'valid-user' in versions prior to 1.3.16.
    220 
    221 Conditional configuration is also useful for mapping static resources, i.e. serving out images and CSS directly instead of through FastCGI:
     203}}}
     204Note that Lighttpd (v1.4.3) stops if the password file doesn't exist.
     205
     206Note that Lighttpd doesn't support 'valid-user' in versions prior to 1.3.16.
     207
     208Conditional configuration is also useful for mapping static resources, ie serving out images and CSS directly instead of through FastCGI:
    222209{{{
    223210# Aliasing functionality is needed
    … …  
    243230}
    244231}}}
     232
    245233The 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.
    246234Also 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:
    … …  
    274262}}}
    275263
    276 Changing date/time format also supported by lighttpd over environment variable LC_TIME
     264Changing date/time format also supported by lighttpd over environment variable LC_TIME:
    277265{{{
    278266fastcgi.server = ("/trac" =>
    … …  
    293281]
    294282
    295 Relaunch lighttpd, and browse to `http://yourhost.example.org/trac` to access Trac.
    296 
    297 Note about running lighttpd with reduced permissions:
    298 
    299 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.
    300 
    301 
    302 == Simple !LiteSpeed Configuration ==
     283Relaunch Lighttpd and browse to `http://yourhost.example.org/trac` to access Trac.
     284
     285Note 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.
     286
     287== Simple !LiteSpeed Configuration
    303288
    304289The FastCGI front-end was developed primarily for use with alternative webservers, such as [http://www.litespeedtech.com/ LiteSpeed].
    … …  
    306291!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.
    307292
    308  1. Please make sure you have first have a working install of a Trac project. Test install with “tracd” first.
    309 
    310  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:
    311 
     293 1. Please make sure you have a working install of a Trac project. Test install with "tracd" first.
     294
     295 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:
    312296{{{
    313297http://yourdomain.com/trac/
    314298}}}
    315299
    316  3. Go “!TracVhost → External Apps” tab and create a new “External Application”.
    317 
     300 3. Go "!TracVhost → External Apps" tab and create a new "External Application".
    318301{{{
    319302Name: MyTracFCGI       
    … …  
    332315}}}
    333316
    334  4. Optional. If you need to use htpasswd based authentication. Go to “!TracVhost → Security” tab and create a new security “Realm”.
     317 4. Optional: If you need to use htpasswd based authentication. Go to "!TracVhost → Security" tab and create a new security Realm.
    335318
    336319{{{
    … …  
    342325If 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.
    343326
    344  5. Go to “!PythonVhost → Contexts” and create a new “FCGI Context”.
     327 5. Go to "!PythonVhost → Contexts" and create a new FCGI Context.
    345328
    346329{{{
    … …  
    365348}}}
    366349
    367 
    368 == Simple Nginx Configuration ==
     350== Simple Nginx Configuration
    369351
    370352Nginx is able to communicate with FastCGI processes, but can not spawn them. So you need to start FastCGI server for Trac separately.
    … …  
    471453
    472454The above assumes that:
    473  * There is a user named 'trac' for running trac instances and keeping trac environments in its home directory.
     455 * There is a user named 'trac' for running trac instances and keeping trac environments in its home directory
    474456 * `/home/trac/instance` contains a trac environment
    475457 * `/home/trac/htpasswd` contains authentication information
    … …  
    479461
    480462Unfortunately nginx does not support variable expansion in fastcgi_pass directive.
    481 Thus it is not possible to serve multiple trac instances from one server block.
    482 
    483 If you worry enough about security, run trac instances under separate users.
    484 
    485 Another way to run trac as a FCGI external application is offered in ticket #T6224
     463Thus it is not possible to serve multiple Trac instances from one server block.
     464
     465If you worry enough about security, run Trac instances under separate users.
     466
     467Another way to run Trac as a FCGI external application is offered in ticket #T6224
    486468
    487469----