On Aug 24, 2006, at 12:36 AM, uuellbee wrote:
> After reading the wiki page about mod_python, threads in this group,
> and the Django documentation, I finally got a mod_python setup working.
> In the end, it's pretty simple, but figuring it out wasn't much fun. I
> added an example to the bottom of the wiki page. I did that instead of
> posting it here because I figure that is the first place most people
> will look.
I agree, I switched the PylonsHQ site over yesterday, and there were
some quirks getting it to run at the site root.
> The example there doesn't run at the site root. I figured out that you
> can run a project at the site root by removing all the DocumentRoot
> stuff (leaving it in was causing infinite redirection) and just having
> something like this in the top-level of the VirtualHost container:
Here's what my eventual setup looked like. This setup assumes you have
Apache 2.0+ and mod_python.
First, the mod_python.wsgi script the Wiki points to needs a minor
change. This is because it doesn't properly handle the case when
SCRIPT_NAME isn't set in your mod_python config. The following lines
need to be added to the file around line 110 so that the section
dealing with SCRIPT_NAME looks like this:
111 if 'SCRIPT_NAME' not in options:
112 options['SCRIPT_NAME'] = ''
113
114 if 'SCRIPT_NAME' in options:
115 # Override SCRIPT_NAME and PATH_INFO if requested.
116 env['SCRIPT_NAME'] = options['SCRIPT_NAME']
117 env['PATH_INFO'] =
req.uri[len(options['SCRIPT_NAME']):]
118
119 env['wsgi.input'] = InputWrapper(req)
This way the script will properly deal with being at the root. I
decided to avoid the .htaccess thing, so this is what the full
VirtualHost looks like for PylonsHQ. Keep in mind I'm also serving
non-Pylons content, which you might want to do as well (svn, trac,
etc):
<VirtualHost *:80>
ServerAdmin EMAIL_ADDRESS
ServerName pylonshq.com
DocumentRoot /home/pylonshq/pylonshq # ROOT OF THE PYLONSHQ
PROJECT
CustomLog "/var/log/httpd/pylonshq.com/access_log" clf
ErrorLog "/var/log/httpd/pylonshq.com/error_log"
Alias /WebHelpers "/usr/local/www/pylonshq/WebHelpers"
Alias /trac "/usr/local/share/trac/htdocs"
Alias /files "/usr/local/www/pylonshq/files"
Alias /project/pylonshq
/usr/local/share/trac/cgi-bin/trac.fcgi/pylonshq
Alias /project /usr/local/share/trac/cgi-bin/trac.fcgi/pylonshq
# REMOVE THIS IF YOU ARENT USING mod_cache + mod_disk_cache
CacheRoot /tmp/apachecache
CacheSize 51200
CacheEnable disk /style
CacheEnable disk /img
CacheEnable disk /scripts
CacheEnable disk /trac/js
CacheEnable disk /trac/css
<Location />
SetHandler mod_python
PythonHandler mod_python.wsgi
PythonPath
"['/home/pylonshq/pylonshq','/home/pylonshq/lib/python2.4/'] +
sys.path"
PythonAutoReload Off
PythonOption wsgi.application startup::app
# Insert filter, REMOVE THIS IF YOU ARENT USING mod_deflate
SetOutputFilter DEFLATE
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
SetEnvIfNoCase Request_URI \
\.(?:gif|jpe?g|png)$ no-gzip dont-vary
Header append Vary User-Agent env=!dont-vary
</Location>
<LocationMatch /(trac|WebHelpers|RailsHelpers|files).*>
# HERE, WE TURN OFF PYLONS FOR THE OTHER LOCATIONS
SetHandler None
</LocationMatch>
<LocationMatch /project>
# TRAC IS RUNNING THROUGH FASTCGI
SetHandler fastcgi-script
Options +ExecCGI
</LocationMatch>
<Location "/project/pylonshq/login">
# TRAC's LOGIN FILE
AuthType Digest
AuthName "PylonsHQ"
AuthDigestFile /somewhere.htpasswd
Require valid-user
</Location>
<Location /svn>
DAV svn
SVNPath /home/svn/pylons
AuthType Digest
AuthName Pylons
AuthDigestFile /somewhere_else.htpasswd
<LimitExcept GET PROPFIND OPTIONS REPORT>
Require valid-user
</LimitExcept>
</Location>
</VirtualHost>
And the startup.py script that is inside /home/pylonshq/pylonshq:
from paste.deploy import loadapp
import os
import site
site.addsitedir('/home/pylonshq/lib/python2.4/site-packages/')
heredir = os.path.dirname(__file__)
app = loadapp("config:%s" % os.path.join(heredir, 'pylonshq.ini'))
So, things to note.
I'm not having Apache serve the projects public files (static media)
directly. This is because having Pylons serve static content is rather
powerful, and it can load static content from multiple paths at once,
capabilities HTTP servers like Apache and Lighttpd do not have. To
compensate for performance, I have mod_cache/mod_disk_cache caching the
content under the URL's (/img, /styles, etc) so that it significantly
lowers the load on the Python app and I get rather nice speed out of
it. (Note, the release version of Paste does not set Last-Modified
headers, upgrade to Paste==dev if you're using mod_cache so that the
Last-Modified headers are set)
I have the SetHandler for the root in a Location block. This is to
ensure that when Apache checks priorities on how to serve content under
various URL's, I can disable Pylons for the URL root's that I want Trac
to handle. You can add additional Location blocks for other URL spaces
that you'd like handled differently as well, and it makes it pretty
clean in my opinion.
The /home/pylonshq is a user by the name of 'pylonshq'. Sorry if that
caused some confusion. This user has a virtual Python setup, thus the
'import site, and site.addsitedir' lines in the startup.py. If you're
not using a virtual Python setup, those lines are not needed.
I'm using a virtual user to run the site so that I can test out updates
and such without worrying about whats system installed. If you have
multiple virtual hosted sites running with multiple virtual Python
package installs, you *should* use the PythonInterpreter option to have
each virtual host use a different Python interpreter. That way you can
avoid having Python path conflicts loading un-intended versions of a
module. (Note that this is also suggested for multiple Django sites as
Django though for a different reason).
I will be turning this into a doc, and likely the *recommended*
deployment method for Pylons (and probably Paste apps in general). I
also plan on updating the WSGI script so that the startup.py file is
not needed. Maybe a wsgi_paste script that lets you set the ini file in
the Apache config.
Any thoughts, questions?
Cheers,
Ben
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