1. Deploying a Web Application
Thierry Sans

2. What you need
Web Host A home for your website
A name for your website
Domain Name
www.myflippylocation.com

3. Web Hosting

4. Development Server vs Production Server
➡ Django provides a development server
๏ Does not scale with multiple requests (high threading)
✓ We need to setup a production server

5. Web Hosting
Storage How much space do you need?
Bandwidth How much traffic do you expect?
Money How much do you want to spend daily?

6. Do you want/need to manage ...
Yes physical No
infrastructure?
physical Yes operating No
server system?
Virtual Share
Private Web
Server Host

7. source “The State of Web Development 2010”
from www.webdirections.org

8. Dedicated Physical Server
✓ Total Control
๏ Maintenance of the physical infrastructure
๏ Administration of the operating system
๏ Flexibility

9. Virtual Private Server (VPS)
๏ Administration of the operating system
✓ No maintenance of the physical infrastructure
✓ Flexibility (pay for what you need)

10. Shared Web Host
✓ No administration of the operating system
๏ Cost
๏ Not adequate for specific needs

11. Choosing the Technology

12. Choosing an operating system
source “The State of Web Development 2010”
from www.webdirections.org

13. Choosing a web server
source “The State of Web Development 2010”
from www.webdirections.org

14. Choosing a database
source “The State of Web Development 2010”
from www.webdirections.org

15. The popularity of LAMP
• Linux
• Apache
• MySQL
• Perl / PHP / Pyhton

16. Choosing a technology
• Choosing a technology depends on
Specific applications that your web
Specific needs
applications uses
What you are comfortable to
Security
administer

17. Domain Name

18. Internet Top Level Names
• See List of Internet top-level domains (Wikipedia)

19. How to get a domain name?
• You need to buy one from a Domain Name Registrar

20. What about Qatar?
✓ A domain name in .qa
➡ See Qatar Domain Registry

21. Step 1 - Buy your domain name
• Can be more or less expensive

22. Step 2 - Configure
➡ Attach an IP address (or another URL) to your domaine name

23. Django with Apache

24. The big picture
Server Side
Client Side
mod_wsgi
myServlet.java
Web Browser
Database
Web Server Server

25. Apache and Python - 3 solutions
➡ How Apache runs Python code
• mod_wsgi
• FastCGI
• Mod_python (deprecated)

26. Apache and Python - 3 solutions
➡ How Apache runs Python code
• mod_wsgi
• FastCGI
• Mod_python (deprecated)

27. Apache and mod_wsgi
• Apache
http://www.apache.org/
• Python WSGI adapter for Apache (mod_wsgi)
http://code.google.com/p/modwsgi/

28. django.wsgi
Wsgi file and permissions tsansweb/
__init__.py
manage.py
settings.py
➡ Create a django.wsgi file urls.py
tsans.db
➡ Modify the permissions for Apache
uploads/
$ chown -R :_www tsans-web WebGallery/
➡ Modify the permissions for Apache
$ chmod g+w tsansweb
$ chmod g+w tsansweb/tsans.db

29. django.wsgi
Wsgi file and permissions tsansweb/
__init__.py
manage.py
settings.py
➡ Create a django.wsgi file urls.py
tsans.db
➡ Modify the permissions for Apache
uploads/
$ chown -R :_www tsans-web WebGallery/
➡ Modify the permissions for Apache _www for Mac OS
www-data for Linux
$ chmod g+w tsansweb
$ chmod g+w tsansweb/tsans.db

30. Django WSGI file (Django version 1.3) django.wsgi
import os
import sys
path = os.path.abspath(os.path.dirname(__file__))
if path not in sys.path:
sys.path.append(path)
path+="/tsansweb"
if path not in sys.path:
sys.path.append(path)
os.environ['DJANGO_SETTINGS_MODULE'] = 'tsansweb.settings'
import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

31. Django WSGI file (Django version 1.3) django.wsgi
import os
import sys
path = os.path.abspath(os.path.dirname(__file__))
if path not in sys.path:
sys.path.append(path)
Django project path
path+="/tsansweb"
if path not in sys.path:
sys.path.append(path)
os.environ['DJANGO_SETTINGS_MODULE'] = 'tsansweb.settings'
import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

32. Django WSGI file (Django version 1.3) django.wsgi
import os
import sys
path = os.path.abspath(os.path.dirname(__file__))
if path not in sys.path:
sys.path.append(path)
Django project path
path+="/tsansweb"
if path not in sys.path:
sys.path.append(path)
Settings module
os.environ['DJANGO_SETTINGS_MODULE'] = 'tsansweb.settings'
import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

33. httpd.conf (Apache) /etc/apache2/httpd.conf
....
LoadModule wsgi_module libexec/apache2/mod_wsgi.so
WSGIScriptAlias / /Users/tsans/Sites/tsansweb.wsgi
....

34. httpd.conf (Apache) /etc/apache2/httpd.conf
path to the wsgi module
....
LoadModule wsgi_module libexec/apache2/mod_wsgi.so
WSGIScriptAlias / /Users/tsans/Sites/tsansweb.wsgi
....

35. httpd.conf (Apache) /etc/apache2/httpd.conf
path to the wsgi module
....
LoadModule wsgi_module libexec/apache2/mod_wsgi.so
WSGIScriptAlias / /Users/tsans/Sites/tsansweb.wsgi
....
path to your wsgi file

36. Django and MySQL

37. MySQL
• MySQL
http://www.mysql.com/

38. Configure Django for MySQL
tsansweb/settings.py
....
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'USER': 'Django',
'PASSWORD': 'Pass4Django',
'HOST': '', # Set to empty string for localhost.
'PORT': '', # Set to empty string for default.
}
}
....

39. Configure Django for MySQL
tsansweb/settings.py
....
DATABASES = {
'default': {
'ENGINE':
'USER':
'django.db.backends.mysql',
'Django',
MySQL user and password
'PASSWORD': 'Pass4Django',
'HOST': '', # Set to empty string for localhost.
'PORT': '', # Set to empty string for default.
}
}
....