Changes between Version 3 and Version 4 of TracModPython


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Timestamp:
Jun 6, 2017, 5:30:40 PM (2 years ago)
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trac
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  • TracModPython

    v3 v4  
    1 = Trac and mod_python =
    21[[TracGuideToc]]
    32
     3= Trac and mod_python
     4
     5Mod_python is an [https://httpd.apache.org/ Apache] module that embeds the Python interpreter within the server, so that web-based applications in Python will run many times faster than traditional CGI and will have the ability to retain database connections.
    46Trac 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.
    57
    6 These 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].
    7 
    8 == A Word of Warning ==
    9 
    10 As 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.
    11 
    12 == Simple configuration ==
     8These instructions are for Apache 2. If you are using Apache 1.3, you may have some luck with [trac:wiki:TracModPython2.7 TracModPython2.7], but that is a deprecated setup.
     9
     10[[PageOutline(2-3,Overview,inline)]]
     11
     12== Simple configuration: single project == #Simpleconfiguration
    1313
    1414If you just installed mod_python, you may have to add a line to load the module in the Apache configuration:
    15 {{{
     15{{{#!apache
    1616LoadModule python_module modules/mod_python.so
    1717}}}
    1818
    19 ''Note: The exact path to the module depends on how the HTTPD installation is laid out.''
    20 
    21 On Debian using apt-get
    22 {{{
     19'''Note''': The exact path to the module depends on how the HTTPD installation is laid out.
     20
     21On Debian using apt-get:
     22{{{#!sh
    2323apt-get install libapache2-mod-python libapache2-mod-python-doc
    2424}}}
    25 (Still on Debian) after you have installed mod_python, you must enable the modules in apache2 (equivalent of the above Load Module directive):
    26 {{{
     25
     26Still on Debian, after you have installed mod_python, you must enable the modules in apache2, equivalent to the above Load Module directive:
     27{{{#!sh
    2728a2enmod python
    2829}}}
     30
    2931On Fedora use, using yum:
    30 {{{
     32{{{#!sh
    3133yum install mod_python
    3234}}}
    33 You can test your mod_python installation by adding the following to your httpd.conf.  You should remove this when you are done testing for security reasons. Note: mod_python.testhandler is only available in mod_python 3.2+.
    34 {{{
    35 #!xml
     35
     36You can test your mod_python installation by adding the following to your httpd.conf. You should remove this when you are done testing for security reasons. Note: mod_python.testhandler is only available in mod_python 3.2+.
     37{{{#!apache
    3638<Location /mpinfo>
    3739   SetHandler mod_python
     
    4446
    4547A simple setup of Trac on mod_python looks like this:
    46 {{{
    47 #!xml
     48{{{#!apache
    4849<Location /projects/myproject>
    4950   SetHandler mod_python
     
    5758}}}
    5859
    59 The option '''`TracUriRoot`''' may or may not be necessary in your setup. Try your configuration without it; if the URLs produced by Trac look wrong, if Trac does not seem to recognize URLs correctly, or you get an odd "No handler matched request to..." error, add the '''`TracUriRoot`''' option.  You will notice that the `Location` and '''`TracUriRoot`''' have the same path.
    60 
    61 The options available are
    62 {{{
    63     # For a single project
    64     PythonOption TracEnv /var/trac/myproject
    65     # For multiple projects
    66     PythonOption TracEnvParentDir /var/trac/myprojects
    67     # For the index of multiple projects
    68     PythonOption TracEnvIndexTemplate /srv/www/htdocs/trac/project_list_template.html
    69     # A space delimitted list, with a "," between key and value pairs.
    70     PythonOption TracTemplateVars key1,val1 key2,val2
    71     # Useful to get the date in the wanted order
    72     PythonOption TracLocale en_GB.UTF8
    73     # See description above       
    74     PythonOption TracUriRoot /projects/myproject
    75 }}}
    76 
    77 === Python Egg Cache ===
    78 
    79 Compressed python eggs like Genshi are normally extracted into a directory named `.python-eggs` in the users home directory. Since apache's home usually is not writable an alternate egg cache directory can be specified like this:
    80 {{{
     60The option '''`TracUriRoot`''' may or may not be necessary in your setup. Try your configuration without it; if the URLs produced by Trac look wrong, if Trac does not seem to recognize URLs correctly, or you get an odd "No handler matched request to..." error, add the '''`TracUriRoot`''' option. You will notice that the `Location` and '''`TracUriRoot`''' have the same path.
     61
     62The options available are:
     63{{{#!apache
     64# For a single project
     65PythonOption TracEnv /var/trac/myproject
     66
     67# For multiple projects
     68PythonOption TracEnvParentDir /var/trac/myprojects
     69
     70# For the index of multiple projects
     71PythonOption TracEnvIndexTemplate /srv/www/htdocs/trac/project_list_template.html
     72
     73# A space delimitted list, with a "," between key and value pairs.
     74PythonOption TracTemplateVars key1,val1 key2,val2
     75
     76# Useful to get the date in the wanted order
     77PythonOption TracLocale en_GB.UTF8
     78
     79# See description above       
     80PythonOption TracUriRoot /projects/myproject
     81}}}
     82
     83=== Python Egg Cache
     84
     85Compressed Python eggs like Genshi are normally extracted into a directory named `.python-eggs` in the users home directory. Since Apache's home usually is not writeable, an alternate egg cache directory can be specified like this:
     86{{{#!apache
    8187PythonOption PYTHON_EGG_CACHE /var/trac/myprojects/egg-cache
    8288}}}
    8389
    84 or you can uncompress the Genshi egg to resolve problems extracting from it.
    85 === Configuring Authentication ===
    86 
    87 Creating password files and configuring authentication works similar to the process for [wiki:TracCgi#AddingAuthentication CGI]:
    88 {{{
    89 #!xml
    90 <Location /projects/myproject/login>
    91   AuthType Basic
    92   AuthName "myproject"
    93   AuthUserFile /var/trac/myproject/.htpasswd
    94   Require valid-user
    95 </Location>
    96 }}}
    97 
    98 Configuration for mod_ldap authentication in Apache is a bit tricky (httpd 2.2.x and OpenLDAP: slapd 2.3.19)
    99 
    100 1. You need to load the following modules in Apache httpd.conf
    101 {{{
    102 LoadModule ldap_module modules/mod_ldap.so
    103 LoadModule authnz_ldap_module modules/mod_authnz_ldap.so
    104 }}}
    105 
    106 2. Your httpd.conf also needs to look something like:
    107 
    108 {{{
    109 #!xml
    110 <Location /trac/>
    111   SetHandler mod_python
    112   PythonInterpreter main_interpreter
    113   PythonHandler trac.web.modpython_frontend
    114   PythonOption TracEnv /home/trac/
    115   PythonOption TracUriRoot /trac/
    116   Order deny,allow
    117   Deny from all
    118   Allow from 192.168.11.0/24
    119   AuthType Basic
    120   AuthName "Trac"
    121   AuthBasicProvider "ldap"
    122   AuthLDAPURL "ldap://127.0.0.1/dc=example,dc=co,dc=ke?uid?sub?(objectClass=inetOrgPerson)"
    123   authzldapauthoritative Off
    124   require valid-user
    125 </Location>
    126 }}}
    127 
    128 Or the LDAP interface to a Microsoft Active Directory:
    129 
    130 {{{
    131 #!xml
    132 <Location /trac/>
    133   SetHandler mod_python
    134   PythonInterpreter main_interpreter
    135   PythonHandler trac.web.modpython_frontend
    136   PythonOption TracEnv /home/trac/
    137   PythonOption TracUriRoot /trac/
    138   Order deny,allow
    139   Deny from all
    140   Allow from 192.168.11.0/24
    141   AuthType Basic
    142   AuthName "Trac"
    143   AuthBasicProvider "ldap"
    144   AuthLDAPURL "ldap://adserver.company.com:3268/DC=company,DC=com?sAMAccountName?sub?(objectClass=user)"
    145   AuthLDAPBindDN       ldap-auth-user@company.com
    146   AuthLDAPBindPassword "the_password"
    147   authzldapauthoritative Off
    148   # require valid-user
    149   require ldap-group CN=Trac Users,CN=Users,DC=company,DC=com
    150 </Location>
    151 }}}
    152 
    153 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.
    154 
    155 Note 2: Active Directory requires an authenticating user/password to access records (AuthLDAPBindDN and AuthLDAPBindPassword).
    156 
    157 Note 3: The directive "require ldap-group ..."  specifies an AD group whose members are allowed access.
    158 
    159 
    160 === Setting the Python Egg Cache ===
    161 
    162 If 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.
    163 
    164 {{{
    165 #!xml
     90Or you can uncompress the Genshi egg to resolve problems extracting from it.
     91
     92=== Configuring Authentication
     93
     94See corresponding section in the [wiki:TracModWSGI#ConfiguringAuthentication] page.
     95
     96== Advanced Configuration
     97
     98=== Setting the Python Egg Cache
     99
     100If 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.
     101
     102{{{#!apache
    166103<Location /projects/myproject>
    167104  ...
     
    171108}}}
    172109
    173 
    174 === Setting the !PythonPath ===
    175 
    176 If the Trac installation isn't installed in your Python path, you'll have to tell Apache where to find the Trac mod_python handler  using the `PythonPath` directive:
    177 {{{
    178 #!xml
     110=== Setting the !PythonPath
     111
     112If the Trac installation isn't installed in your Python path, you will have to tell Apache where to find the Trac mod_python handler  using the `PythonPath` directive:
     113{{{#!apache
    179114<Location /projects/myproject>
    180115  ...
     
    186121Be careful about using the !PythonPath directive, and ''not'' `SetEnv PYTHONPATH`, as the latter won't work.
    187122
    188 == Setting up multiple projects ==
     123=== Setting up multiple projects
    189124
    190125The Trac mod_python handler supports a configuration option similar to Subversion's `SvnParentPath`, called `TracEnvParentDir`:
    191 {{{
    192 #!xml
     126{{{#!apache
    193127<Location /projects>
    194128  SetHandler mod_python
     
    203137
    204138If you don't want to have the subdirectory listing as your projects home page you can use a
    205 {{{
    206 #!xml
     139{{{#!apache
    207140<LocationMatch "/.+/">
    208141}}}
     
    211144
    212145You can also use the same authentication realm for all of the projects using a `<LocationMatch>` directive:
    213 {{{
    214 #!xml
     146{{{#!apache
    215147<LocationMatch "/projects/[^/]+/login">
    216148  AuthType Basic
     
    221153}}}
    222154
    223 == Virtual Host Configuration ==
    224 
    225 Below is the sample configuration required to set up your trac as a virtual server (i.e. when you access it at the URLs like
    226 !http://trac.mycompany.com):
    227 
    228 {{{
    229 #!xml
    230 <VirtualHost * >
     155=== Virtual Host Configuration
     156
     157Below is the sample configuration required to set up your Trac as a virtual server, ie when you access it at the URLs like
     158`http://trac.mycompany.com`:
     159
     160{{{#!apache
     161<VirtualHost *>
    231162    DocumentRoot /var/www/myproject
    232163    ServerName trac.mycompany.com
     
    248179
    249180This does not seem to work in all cases. What you can do if it does not:
    250  * Try using `<LocationMatch>` instead of `<Location>`
    251  * <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).
     181 * Try using `<LocationMatch>` instead of `<Location>`.
     182 * `<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, ie you get the infamous Authentication information missing error. If this is the case, try using a sub-directory for Trac instead of the root, ie /web/ and /web/login instead of / and /login.
    252183 * Depending on apache's `NameVirtualHost` configuration, you may need to use `<VirtualHost *:80>` instead of `<VirtualHost *>`.
    253184
    254 For a virtual host that supports multiple projects replace "`TracEnv`" /var/trac/myproject with "`TracEnvParentDir`" /var/trac/
    255 
    256 Note: !DocumentRoot should not point to your Trac project env. As Asmodai wrote on #trac: "suppose there's a webserver bug that allows disclosure of !DocumentRoot they could then leech the entire Trac environment".
    257 
    258 == Troubleshooting ==
    259 
    260 In general, if you get server error pages, you can either check the Apache error log, or enable the `PythonDebug` option:
    261 {{{
    262 #!xml
     185For a virtual host that supports multiple projects replace `TracEnv /var/trac/myproject` with `TracEnvParentDir /var/trac`.
     186
     187'''Note''': !DocumentRoot should not point to your Trac project env. As Asmodai wrote on #trac: "suppose there's a webserver bug that allows disclosure of !DocumentRoot they could then leech the entire Trac environment".
     188
     189== Troubleshooting
     190
     191If you get server error pages, you can either check the Apache error log, or enable the `PythonDebug` option:
     192{{{#!apache
    263193<Location /projects/myproject>
    264194  ...
     
    269199For multiple projects, try restarting the server as well.
    270200
     201=== Login Not Working
     202
     203If you've used `<Location />` directive, it will override any other directives, as well as `<Location /login>`.
     204The workaround is to use negation expression as follows (for multi project setups):
     205{{{#!apache
     206#this one for other pages
     207<Location ~ "/*(?!login)">
     208   SetHandler mod_python
     209   PythonHandler trac.web.modpython_frontend
     210   PythonOption TracEnvParentDir /projects
     211   PythonOption TracUriRoot /
     212</Location>
     213
     214#this one for login page
     215<Location ~ "/[^/]+/login">
     216   SetHandler mod_python
     217   PythonHandler trac.web.modpython_frontend
     218   PythonOption TracEnvParentDir /projects
     219   PythonOption TracUriRoot /
     220
     221   #remove these if you don't want to force SSL
     222   RewriteEngine On
     223   RewriteCond %{HTTPS} off
     224   RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
     225
     226   AuthType Basic
     227   AuthName "Trac"
     228   AuthUserFile /projects/.htpasswd
     229   Require valid-user
     230</Location>
     231}}}
     232
    271233=== Expat-related segmentation faults === #expat
    272234
    273235This problem will most certainly hit you on Unix when using Python 2.4.
    274 In Python 2.4, some version of Expat (an XML parser library written in C) is used,
    275 and if Apache is using another version, this results in segmentation faults.
    276 As Trac 0.11 is using Genshi, which will indirectly use Expat, that problem
    277 can now hit you even if everything was working fine before with Trac 0.10.
    278 
    279 See Graham Dumpleton's detailed [http://www.dscpl.com.au/wiki/ModPython/Articles/ExpatCausingApacheCrash explanation and workarounds] for the issue.
    280 
    281 === Form submission problems ===
     236In Python 2.4, some version of [http://expat.sourceforge.net/ Expat] (an XML parser library written in C) is used and if Apache is using another version, this results in segmentation faults.
     237As Trac 0.11 is using Genshi, which will indirectly use Expat, that problem can now hit you even if everything was working fine before with Trac 0.10. This problem has not been reported for Python 2.5+, so best to upgrade.
     238
     239=== Form submission problems
    282240
    283241If you're experiencing problems submitting some of the forms in Trac (a common problem is that you get redirected to the start page after submission), check whether your {{{DocumentRoot}}} contains a folder or file with the same path that you mapped the mod_python handler to. For some reason, mod_python gets confused when it is mapped to a location that also matches a static resource.
    284242
    285 === Problem with virtual host configuration ===
    286 
    287 If the <Location /> directive is used, setting the `DocumentRoot` may result in a ''403 (Forbidden)'' error. Either remove the `DocumentRoot` directive, or make sure that accessing the directory it points is allowed (in a corresponding `<Directory>` block).
    288 
    289 Using <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.
    290 
    291 === Problem with zipped egg ===
    292 
    293 It'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:
    294 
    295 {{{
     243=== Problem with virtual host configuration
     244
     245If the <Location /> directive is used, setting the `DocumentRoot` may result in a ''403 (Forbidden)'' error. Either remove the `DocumentRoot` directive, or make sure that accessing the directory it points is allowed, in a corresponding `<Directory>` block.
     246
     247Using <Location /> together with `SetHandler` resulted in having everything handled by mod_python, which leads to not being able to download any CSS or images/icons. Use <Location /trac> `SetHandler None` </Location> to circumvent the problem, though this may not be the most elegant solution.
     248
     249=== Problem with zipped egg
     250
     251It'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 this, try installing Trac using the `--always-unzip` option:
     252
     253{{{#!sh
    296254easy_install --always-unzip Trac-0.12b1.zip
    297255}}}
    298256
    299 === Using .htaccess ===
     257=== Using .htaccess
    300258
    301259Although it may seem trivial to rewrite the above configuration as a directory in your document root with a `.htaccess` file, this does not work. Apache will append a "/" to any Trac URLs, which interferes with its correct operation.
    302260
    303 It may be possible to work around this with mod_rewrite, but I failed to get this working. In all, it is more hassle than it is worth. Stick to the provided instructions. :)
    304 
    305 A success story: For me it worked out-of-box, with following trivial config:
    306 {{{
     261It may be possible to work around this with mod_rewrite, but I failed to get this working. In all, it is more hassle than it is worth.
     262
     263This also works out-of-box, with following trivial config:
     264{{{#!apache
    307265SetHandler mod_python
    308266PythonInterpreter main_interpreter
     
    317275}}}
    318276
    319 The `TracUriRoot` is obviously the path you need to enter to the browser to get to the trac (e.g. domain.tld/projects/trac)
    320 
    321 === Additional .htaccess help ===
    322 
    323 If you are using the .htaccess method you may have additional problems if your trac directory is inheriting .htaccess directives from another. This may also help to add to your .htaccess file:
    324 
    325 {{{
     277The `TracUriRoot` is obviously the path you need to enter to the browser to get to Trac, eg `domain.tld/projects/trac`.
     278
     279=== Additional .htaccess help
     280
     281If you are using the .htaccess method you may have additional problems if your Trac directory is inheriting .htaccess directives from another. This may also help to add to your .htaccess file:
     282
     283{{{#!apache
    326284<IfModule mod_rewrite.c>
    327285  RewriteEngine Off
     
    329287}}}
    330288
    331 
    332 === Win32 Issues ===
    333 If 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.
    334 
    335 
    336 === OS X issues ===
    337 
    338 When 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].
    339 
    340 === SELinux issues ===
    341 
    342 If Trac reports something like: ''Cannot get shared lock on db.lock''
    343 The security context on the repository may need to be set:
    344 
    345 {{{
     289=== Platform specific issues
     290==== Win32 Issues
     291
     292If 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.
     293
     294==== OS X issues
     295
     296When 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, so please upgrade mod_python to fix this.
     297
     298==== SELinux issues
     299
     300If Trac reports something like: `Cannot get shared lock on db.lock`, then the security context on the repository may need to be set:
     301
     302{{{#!sh
    346303chcon -R -h -t httpd_sys_content_t PATH_TO_REPOSITORY
    347304}}}
    348305
    349 See also [http://subversion.tigris.org/faq.html#reposperms]
    350 
    351 === FreeBSD issues ===
    352 Pay 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.
    353 
    354 If 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.
    355 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
    356 
    357 {{{
     306See also [http://subversion.apache.org/faq.html#reposperms How do I set repository permissions correctly?]
     307
     308==== FreeBSD issues
     309
     310The FreeBSD ports have both the new and old versions of mod_python and SQLite, but earlier versions of pysqlite and mod_python won't integrate:
     311 * pysqlite requires threaded support in Python
     312 * mod_python requires a threadless install.
     313
     314Apache2 does not automatically support threads on FreeBSD. You could force thread support when running `./configure` for Apache, using `--enable-threads`, but this isn´t recommended.
     315The best option [http://modpython.org/pipermail/mod_python/2006-September/021983.html seems to be] adding to /usr/local/apache2/bin/ennvars the line:
     316
     317{{{#!sh
    358318export LD_PRELOAD=/usr/lib/libc_r.so
    359319}}}
    360320
    361 === Subversion issues ===
    362 
    363 If you get the following Trac Error `Unsupported version control system "svn"` only under mod_python, though it works well on the command-line and even with TracStandalone, chances are that you forgot to add the path to the Python bindings with the [TracModPython#ConfiguringPythonPath PythonPath] directive. (The better way is to add a link to the bindings in the Python `site-packages` directory, or create a `.pth` file in that directory.)
    364 
    365 If 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`).
    366 
    367 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 [trac:#3371 #3371], in order to force the use of the main interpreter:
    368 {{{
     321==== Fedora 7 Issues
     322
     323Make sure you install the 'python-sqlite2' package as it seems to be required for TracModPython, but not for tracd.
     324
     325=== Subversion issues
     326
     327If you get the following Trac error `Unsupported version control system "svn"` only under mod_python, though it works well on the command-line and even with TracStandalone, chances are that you forgot to add the path to the Python bindings with the [TracModPython#ConfiguringPythonPath PythonPath] directive. A better way is to add a link to the bindings in the Python `site-packages` directory, or create a `.pth` file in that directory.
     328
     329If this is not the case, it's possible that you are using Subversion libraries that are binary incompatible with the Apache ones and 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`).
     330
     331You 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. Version 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:
     332{{{#!apache
    369333PythonInterpreter main_interpreter
    370334}}}
    371 This 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.
    372 
    373 === Page layout issues ===
    374 
    375 If the formatting of the Trac pages look weird chances are that the style sheets governing the page layout are not handled properly by the web server. Try adding the following lines to your apache configuration:
    376 {{{
    377 #!xml
     335
     336This is also the recommended workaround for other 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.
     337
     338=== Page layout issues
     339
     340If the formatting of the Trac pages look weird, chances are that the style sheets governing the page layout are not handled properly by the web server. Try adding the following lines to your Apache configuration:
     341{{{#!apache
    378342Alias /myproject/css "/usr/share/trac/htdocs/css"
    379343<Location /myproject/css>
     
    382346}}}
    383347
    384 Note: For the above configuration to have any effect it must be put after the configuration of your project root location, i.e. {{{<Location /myproject />}}}.
    385 
    386 Also, 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`.
    387 
    388 === HTTPS issues ===
    389 
    390 If you want to run Trac fully under https you might find that it tries to redirect to plain http. In this case just add the following line to your apache configuration:
    391 {{{
    392 #!xml
    393 <VirtualHost * >
     348'''Note''': For the above configuration to have any effect it must be put after the configuration of your project root location, ie {{{<Location /myproject />}}}.
     349
     350Also, 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, leave it `Off`.
     351
     352=== HTTPS issues
     353
     354If you want to run Trac fully under https you might find that it tries to redirect to plain http. In this case just add the following line to your Apache configuration:
     355{{{#!apache
     356<VirtualHost *>
    394357    DocumentRoot /var/www/myproject
    395358    ServerName trac.mycompany.com
     
    399362}}}
    400363
    401 === Fedora 7 Issues ===
    402 Make sure you install the 'python-sqlite2' package as it seems to be required for TracModPython but not for tracd
    403 
    404 
    405 === Segmentation fault with php5-mhash or other php5 modules ===
    406 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]
    407 
    408 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]
     364=== Segmentation fault with php5-mhash or other php5 modules
     365
     366You 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 [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=411487 Debian bug report].
     367
     368Some people also have troubles when using PHP5 compiled with its own third party libraries instead of system libraries. Check [http://www.djangoproject.com/documentation/modpython/#if-you-get-a-segmentation-fault Django segmentation fault].
    409369
    410370----
    411 See also:  TracGuide, TracInstall, [wiki:TracModWSGI ModWSGI], [wiki:TracFastCgi FastCGI],  [trac:TracNginxRecipe TracNginxRecipe]
     371See also: TracGuide, TracInstall, [wiki:TracModWSGI ModWSGI], [wiki:TracFastCgi FastCGI], [trac:TracNginxRecipe]