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Thursday, February 24, 2011

Deploying web page in python using PYLONS.

This approach is simple and painless. (It differs from the one on pylonsbooks much)  It doesn’t use python environment (pyt-env) embedded in userspace etc. ROOT access is required to install pylons in this manner.
Ubuntu version: 10.10 Server
  1. Install apache server

    aptitude install apache2

  2. Check if it works:  should give you: “It works!”
  3. Install  Python WSGI adapter module for Apache

    aptitude install libapache2-mod-wsgi

  4. Disable the default apache site:

    a2dissite 000-default

    (or any other site in: /etc/apache2/sites-enabled)
  5. Install easy_install for python
    apt-get install python-setuptools python-dev build-essential

  6. Set the proxy if necessary:

    export HTTP_PROXY=http://user:pass@

  7. easy_install paste
  8. aptitude install python-pastedeploy
  9. easy_install SQLAlchemy
  10. easy_install Pylons
  11. add www-data user to your user group

    usermod -a -G simplesite www-data

  12. set debug = false in your development.ini

    debug = false

  13. move you application to: /usr/lib/pymodules/python2.6

<VirtualHost *>
    ServerName etiopia
    ServerAlias etiopia

    # Logfiles
    ErrorLog  /var/log/apache2/error.log
    CustomLog /var/log/apache2/access.log combined

    # Setup mod_wsgi
    WSGIScriptAlias / /home/ubuntu/OBIAD/dispatch.wsgi

    <Directory /home/ubuntu/OBIAD>
    Order deny,allow
    Allow from all


  • a2ensite OBIAD

OBIAD is the site name. It can be any name instead of OBIAD.

#Load the Pylons application
from paste.deploy import loadapp
application = loadapp('config:/home/ubuntu/OBIAD/development.ini')

Place your application in the following directory, so that python can find it: /usr/lib/pymodules/python2.6
Restart apache with:

/etc/init.d/apache2 restart

Look for any errors in: /var/log/apache2/error.log
While starting apache I had the following error. Despite this everything worked fine (There was a bug and we can ignore this error):

[error] Exception KeyError: KeyError(140024401471296,) in <module 'threading' from '/usr/lib/python2.6/threading.pyc'> ignored
[error] Exception KeyError: KeyError(140024401471296,) in <module 'threading' from '/usr/lib/python2.6/threading.pyc'> ignored
[notice] caught SIGTERM, shutting down
[warn] mod_wsgi: Compiled for Python/2.6.5.
[warn] mod_wsgi: Runtime using Python/2.6.6.
[notice] Apache/2.2.16 (Ubuntu) mod_wsgi/3.2 Python/2.6.6 configured -- resuming normal operations

Errors you may encounter:
ImportError: No module named paste.deploy –> install paste with “easy_install paste”
ImportError: No module named deploy –> aptitude install python-pastedeploy
OSError: File '/home/ubuntu/OBIAD/development.ini' not found –> copy your *.ini from you application to the destination directory
DistributionNotFound: dinner –> you haven’t copied your application to destination directory (/usr/lib/pymodules/python2.6/)
DistributionNotFound: SQLAlchemy>=0.5 –>  easy_install SQLAlchemy

Proxy causing errors. If you see any of the messages:

[error] [client] IOError: failed to write data
[error] [client] mod_wsgi (pid=7892): Exception occurred processing WSGI script '/home/ubuntu/OBIAD/dispatch.wsgi'.

it’s probably your proxy causing problems. Mod_wsgi does not do well with proxies unfortunately.

1 comment:

  1. Hello,
    I have the error DistributionNotFound:SyncServer but I can't understand what is the application...
    I can't find any application called SynServer
    (I am trying to install my own Firefox Sync server (



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