Changes between Version 1 and Version 2 of TracModPython


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Timestamp:
04/21/12 12:26:13 (12 years ago)
Author:
trac
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  • TracModPython

    v1 v2  
    44Trac supports [http://www.modpython.org/ mod_python], which speeds up Trac's response times considerably, especially compared to [TracCgi CGI], and permits use of many Apache features not possible with [wiki:TracStandalone tracd]/mod_proxy. 
    55 
    6 These instructions are for Apache 2; if you are still using Apache 1.3, you may have some luck with [wiki:TracModPython2.7 TracModPython2.7]. 
    7  
    8 == Simple configuration == 
     6{{{#!div class="important" 
     7** A Word of Warning ** 
     8 
     9As of 16^th^ June 2010, the mod_python project is officially dead.  If you are considering using mod_python for a new installation, '''please don't'''!  There are known issues which will not be fixed and there are now better alternatives.  Check out the main TracInstall pages for your target version for more information. 
     10}}} 
     11 
     12 
     13These instructions are for Apache 2; if you are still using Apache 1.3, you may have some luck with [trac:wiki:TracModPython2.7 TracModPython2.7], but you'll be totally on your own. 
     14 
     15[[PageOutline(2-3,Overview,inline)]] 
     16 
     17== Simple configuration: single project == #Simpleconfiguration 
    918 
    1019If you just installed mod_python, you may have to add a line to load the module in the Apache configuration: 
    … …  
    2130(Still on Debian) after you have installed mod_python, you must enable the modules in apache2 (equivalent of the above Load Module directive): 
    2231{{{ 
    23 a2enmod mod_python 
     32a2enmod python 
    2433}}} 
    2534On Fedora use, using yum: 
    … …  
    3443   PythonInterpreter main_interpreter 
    3544   PythonHandler mod_python.testhandler 
     45   Order allow,deny 
     46   Allow from all 
    3647</Location> 
    3748}}} 
    … …  
    4657   PythonOption TracEnv /var/trac/myproject 
    4758   PythonOption TracUriRoot /projects/myproject 
     59   Order allow,deny 
     60   Allow from all 
    4861</Location> 
    4962}}} 
    … …  
    5568    # For a single project 
    5669    PythonOption TracEnv /var/trac/myproject 
     70 
    5771    # For multiple projects 
    5872    PythonOption TracEnvParentDir /var/trac/myprojects 
     73 
    5974    # For the index of multiple projects 
    6075    PythonOption TracEnvIndexTemplate /srv/www/htdocs/trac/project_list_template.html 
     76 
    6177    # A space delimitted list, with a "," between key and value pairs. 
    6278    PythonOption TracTemplateVars key1,val1 key2,val2 
     79 
    6380    # Useful to get the date in the wanted order 
    6481    PythonOption TracLocale en_GB.UTF8 
     82 
    6583    # See description above         
    6684    PythonOption TracUriRoot /projects/myproject 
    … …  
    7492}}} 
    7593 
     94or you can uncompress the Genshi egg to resolve problems extracting from it. 
     95 
    7696=== Configuring Authentication === 
    7797 
    78 Creating password files and configuring authentication works similar to the process for [wiki:TracCgi#AddingAuthentication CGI]: 
    79 {{{ 
    80 #!xml 
    81 <Location /projects/myproject/login> 
    82   AuthType Basic 
    83   AuthName "myproject" 
    84   AuthUserFile /var/trac/myproject/.htpasswd 
    85   Require valid-user 
    86 </Location> 
    87 }}} 
    88  
    89 Configuration for mod_ldap authentication in Apache is a bit tricky (httpd 2.2.x and OpenLDAP: slapd 2.3.19) 
    90  
    91 1. You need to load the following modules in Apache httpd.conf 
    92 {{{ 
    93 LoadModule ldap_module modules/mod_ldap.so 
    94 LoadModule authnz_ldap_module modules/mod_authnz_ldap.so 
    95 }}} 
    96  
    97 2. Your httpd.conf also needs to look something like: 
    98  
    99 {{{ 
    100 #!xml 
    101 <Location /trac/> 
    102   SetHandler mod_python 
    103   PythonInterpreter main_interpreter 
    104   PythonHandler trac.web.modpython_frontend 
    105   PythonOption TracEnv /home/trac/ 
    106   PythonOption TracUriRoot /trac/ 
    107   Order deny,allow 
    108   Deny from all 
    109   Allow from 192.168.11.0/24 
    110   AuthType Basic 
    111   AuthName "Trac" 
    112   AuthBasicProvider "ldap" 
    113   AuthLDAPURL "ldap://127.0.0.1/dc=example,dc=co,dc=ke?uid?sub?(objectClass=inetOrgPerson)" 
    114   authzldapauthoritative Off 
    115   require valid-user 
    116 </Location> 
    117 }}} 
    118  
    119 Or the LDAP interface to a Microsoft Active Directory: 
    120  
    121 {{{ 
    122 #!xml 
    123 <Location /trac/> 
    124   SetHandler mod_python 
    125   PythonInterpreter main_interpreter 
    126   PythonHandler trac.web.modpython_frontend 
    127   PythonOption TracEnv /home/trac/ 
    128   PythonOption TracUriRoot /trac/ 
    129   Order deny,allow 
    130   Deny from all 
    131   Allow from 192.168.11.0/24 
    132   AuthType Basic 
    133   AuthName "Trac" 
    134   AuthBasicProvider "ldap" 
    135   AuthLDAPURL "ldap://adserver.company.com:3268/DC=company,DC=com?sAMAccountName?sub?(objectClass=user)" 
    136   AuthLDAPBindDN       ldap-auth-user@company.com 
    137   AuthLDAPBindPassword "the_password" 
    138   authzldapauthoritative Off 
    139   # require valid-user 
    140   require ldap-group CN=Trac Users,CN=Users,DC=company,DC=com 
    141 </Location> 
    142 }}} 
    143  
    144 Note 1: This is the case where the LDAP search will get around the multiple OUs, conecting to Global Catalog Server portion of AD (Notice the port is 3268, not the normal LDAP 389). The GCS is basically a "flattened" tree which allows searching for a user without knowing to which OU they belong. 
    145  
    146 Note 2: Active Directory requires an authenticating user/password to access records (AuthLDAPBindDN and AuthLDAPBindPassword). 
    147  
    148 Note 3: The directive "require ldap-group ..."  specifies an AD group whose members are allowed access. 
    149  
     98See corresponding section in the [wiki:TracModWSGI#ConfiguringAuthentication] page. 
     99 
     100 
     101== Advanced Configuration 
     102 
     103=== Setting the Python Egg Cache === 
     104 
     105If the Egg Cache isn't writeable by your Web server, you'll either have to change the permissions, or point Python to a location where Apache can write. This can manifest itself as a ''500 internal server error'' and/or a complaint in the syslog.  
     106 
     107{{{ 
     108#!xml 
     109<Location /projects/myproject> 
     110  ... 
     111  PythonOption PYTHON_EGG_CACHE /tmp  
     112  ... 
     113</Location> 
     114}}} 
    150115 
    151116 
    … …  
    164129Be careful about using the !PythonPath directive, and ''not'' `SetEnv PYTHONPATH`, as the latter won't work. 
    165130 
    166 == Setting up multiple projects == 
     131=== Setting up multiple projects === 
    167132 
    168133The Trac mod_python handler supports a configuration option similar to Subversion's `SvnParentPath`, called `TracEnvParentDir`: 
    … …  
    199164}}} 
    200165 
    201 == Virtual Host Configuration == 
     166=== Virtual Host Configuration === 
    202167 
    203168Below is the sample configuration required to set up your trac as a virtual server (i.e. when you access it at the URLs like 
    … …  
    228193 * Try using `<LocationMatch>` instead of `<Location>` 
    229194 * <Location /> may, in your server setup, refer to the complete host instead of simple the root of the server. This means that everything (including the login directory referenced below) will be sent to python and authentication does not work (i.e. you get the infamous Authentication information missing error). If this applies to you, try using a sub-directory for trac instead of the root (i.e. /web/ and /web/login instead of / and /login). 
     195 * Depending on apache's `NameVirtualHost` configuration, you may need to use `<VirtualHost *:80>` instead of `<VirtualHost *>`. 
    230196 
    231197For a virtual host that supports multiple projects replace "`TracEnv`" /var/trac/myproject with "`TracEnvParentDir`" /var/trac/ 
    … …  
    245211 
    246212For multiple projects, try restarting the server as well. 
     213 
     214===Login Not Working=== 
     215If you've used <Location /> directive, it will override any other directives, as well as <Location /Login>. 
     216The workaround is to use negation expression as follows (for multi project setups): 
     217{{{ 
     218#!xml 
     219#this one for other pages 
     220<Location ~ "/*(?!login)"> 
     221   SetHandler mod_python 
     222   PythonHandler trac.web.modpython_frontend 
     223   PythonOption TracEnvParentDir /projects 
     224   PythonOption TracUriRoot / 
     225 
     226</Location> 
     227#this one for login page 
     228<Location ~ "/[^/]+/login"> 
     229   SetHandler mod_python 
     230   PythonHandler trac.web.modpython_frontend 
     231   PythonOption TracEnvParentDir /projects 
     232   PythonOption TracUriRoot / 
     233 
     234   #remove these if you don't want to force SSL 
     235   RewriteEngine On  
     236   RewriteCond %{HTTPS} off 
     237   RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} 
     238 
     239   AuthType Basic 
     240   AuthName "Trac" 
     241   AuthUserFile /projects/.htpasswd 
     242   Require valid-user 
     243</Location> 
     244}}} 
    247245 
    248246=== Expat-related segmentation faults === #expat 
    … …  
    266264Using <Location /> together with `SetHandler` resulted in having everything handled by mod_python, which leads to not being able download any CSS or images/icons. I used <Location /trac> `SetHandler None` </Location> to circumvent the problem, though I do not know if this is the most elegant solution. 
    267265 
     266=== Problem with zipped egg === 
     267 
     268It's possible that your version of mod_python will not import modules from zipped eggs. If you encounter an `ImportError: No module named trac` in your Apache logs but you think everything is where it should be, this might be your problem. Look in your site-packages directory; if the Trac module appears as a ''file'' rather than a ''directory'', then this might be your problem. To rectify, try installing Trac using the `--always-unzip` option, like this: 
     269 
     270{{{ 
     271easy_install --always-unzip Trac-0.12b1.zip 
     272}}} 
     273 
    268274=== Using .htaccess === 
    269275 
    … …  
    273279 
    274280A success story: For me it worked out-of-box, with following trivial config: 
    275 {{{ 
     281{{{#!xml 
    276282SetHandler mod_python 
    277283PythonInterpreter main_interpreter 
    … …  
    286292}}} 
    287293 
    288 The TracUriRoot is obviously the path you need to enter to the browser to get to the trac (e.g. domain.tld/projects/trac) 
     294The `TracUriRoot` is obviously the path you need to enter to the browser to get to the trac (e.g. domain.tld/projects/trac) 
    289295 
    290296=== Additional .htaccess help === 
    … …  
    298304}}} 
    299305 
    300  
    301 === Win32 Issues === 
     306=== Platform specific issues 
     307==== Win32 Issues ==== 
    302308If you run trac with mod_python < 3.2 on Windows, uploading attachments will '''not''' work. This problem is resolved in mod_python 3.1.4 or later, so please upgrade mod_python to fix this. 
    303309 
    304310 
    305 === OS X issues === 
     311==== OS X issues ==== 
    306312 
    307313When using mod_python on OS X you will not be able to restart Apache using `apachectl restart`. This is apparently fixed in mod_python 3.2, but there's also a patch available for earlier versions [http://www.dscpl.com.au/projects/vampire/patches.html here]. 
    308314 
    309 === SELinux issues === 
     315==== SELinux issues ==== 
    310316 
    311317If Trac reports something like: ''Cannot get shared lock on db.lock'' 
    … …  
    316322}}} 
    317323 
    318 See also [[http://subversion.tigris.org/faq.html#reposperms]] 
    319  
    320 === FreeBSD issues === 
     324See also [http://subversion.tigris.org/faq.html#reposperms] 
     325 
     326==== FreeBSD issues ==== 
    321327Pay attention to the version of the installed mod_python and sqlite packages. Ports have both the new and old ones, but earlier versions of pysqlite and mod_python won't integrate as the former requires threaded support in python, and the latter requires a threadless install. 
    322328 
    323329If you compiled and installed apache2, apache wouldn´t support threads (cause it doesn´t work very well on FreeBSD). You could force thread support when running ./configure for apache, using --enable-threads, but this isn´t recommendable. 
    324 The best option [[http://modpython.org/pipermail/mod_python/2006-September/021983.html seems to be]] adding to /usr/local/apache2/bin/ennvars the line  
     330The best option [http://modpython.org/pipermail/mod_python/2006-September/021983.html seems to be] adding to /usr/local/apache2/bin/ennvars the line  
    325331 
    326332{{{ 
    … …  
    328334}}} 
    329335 
     336 
     337==== Fedora 7 Issues ==== 
     338Make sure you install the 'python-sqlite2' package as it seems to be required for TracModPython but not for tracd 
     339 
     340 
    330341=== Subversion issues === 
    331342 
    … …  
    334345If this is not the case, it's possible that you're using Subversion libraries that are binary incompatible with the apache ones (an incompatibility of the `apr` libraries is usually the cause). In that case, you also won't be able to use the svn modules for Apache (`mod_dav_svn`). 
    335346 
    336 You also need a recent version of `mod_python` in order to avoid a runtime error ({{{argument number 2: a 'apr_pool_t *' is expected}}}) due to the default usage of multiple sub-interpreters. 3.2.8 ''should'' work, though it's probably better to use the workaround described in #3371, in order to force the use of the main interpreter: 
     347You also need a recent version of `mod_python` in order to avoid a runtime error ({{{argument number 2: a 'apr_pool_t *' is expected}}}) due to the default usage of multiple sub-interpreters. 3.2.8 ''should'' work, though it's probably better to use the workaround described in [trac:#3371 #3371], in order to force the use of the main interpreter: 
    337348{{{ 
    338349PythonInterpreter main_interpreter 
    339350}}} 
    340 This is anyway the recommended workaround for other well-known issues seen when using the Python bindings for Subversion within mod_python (#2611, #3455). See in particular Graham Dumpleton's comment in [comment:ticket:3455:9 #3455] explaining the issue. 
     351This is anyway the recommended workaround for other well-known issues seen when using the Python bindings for Subversion within mod_python ([trac:#2611 #2611], [trac:#3455 #3455]). See in particular Graham Dumpleton's comment in [trac:comment:9:ticket:3455 #3455] explaining the issue. 
    341352 
    342353=== Page layout issues === 
    … …  
    352363 
    353364Note: For the above configuration to have any effect it must be put after the configuration of your project root location, i.e. {{{<Location /myproject />}}}. 
     365 
     366Also, setting `PythonOptimize On` seems to mess up the page headers and footers, in addition to hiding the documentation for macros and plugins (see #Trac8956). Considering how little effect the option has, it is probably a good idea to leave it `Off`. 
    354367 
    355368=== HTTPS issues === 
    … …  
    366379}}} 
    367380 
    368 === Fedora 7 Issues === 
    369 Make sure you install the 'python-sqlite2' package as it seems to be required for TracModPython but not for tracd 
    370  
    371381 
    372382=== Segmentation fault with php5-mhash or other php5 modules === 
    373 You may encounter segfaults (reported on debian etch) if php5-mhash module is installed. Try to remove it to see if this solves the problem. See debian bug report [[http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=411487]] 
    374  
    375 Some people also have troubles when using php5 compiled with its own 3rd party libraries instead of system libraries. Check here [[http://www.djangoproject.com/documentation/modpython/#if-you-get-a-segmentation-fault]] 
     383You may encounter segfaults (reported on debian etch) if php5-mhash module is installed. Try to remove it to see if this solves the problem. See debian bug report [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=411487] 
     384 
     385Some people also have troubles when using php5 compiled with its own 3rd party libraries instead of system libraries. Check here [http://www.djangoproject.com/documentation/modpython/#if-you-get-a-segmentation-fault] 
    376386 
    377387---- 
    378 See also:  TracGuide, TracInstall, [wiki:TracModWSGI ModWSGI], [wiki:TracFastCgi FastCGI], [wiki:TracModPython ModPython], [trac:TracNginxRecipe TracNginxRecipe] 
     388See also:  TracGuide, TracInstall, [wiki:TracModWSGI ModWSGI], [wiki:TracFastCgi FastCGI], [trac:TracNginxRecipe TracNginxRecipe]