15-437 Deploying

Transcript

1. Deploying a Web Application Thierry Sans
2. What you need Web Host A home for your website Domain Name A url for your website
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 ... physical infrastructure? operating system? physical server Virtual Private Server Shared Web Host Yes Yes No No
7. Dedicated Physical Server ✓ Total Control ๏ Maintenance of the physical infrastructure ๏ Administration of the operating system ๏ Flexibility
8. Virtual Private Server (VPS) ๏ Administration of the operating system ✓ No maintenance of the physical infrastructure ✓ Flexibility (pay for what you need)
9. Shared Web Host ✓ No administration of the operating system ๏ Cost ๏ Not adequate for specific needs
10. The Web Stack
11. Choosing the technology • The operating system • The web server • The database http://w3techs.com/technologies
12. Choosing a technology Choosing a technology depends on Specific needs Specific applications that your web applications uses Security What you are comfortable to administer
13. LAMP vs MEAN • Linux • Apache • MySQL • PHP ( / Perl / Python) • MongoDB • Express • Angular • Node.js
14. Django and Apache
15. The big picture Client Side Web Browser Server Side Web Server myServlet.java Database
 Server mod_wsgi
16. Apache and Python - 3 solutions ➡ How Apache runs Python code • mod_wsgi • FastCGI, SCGI, AJP (deprecated) • Mod_python (deprecated)
17. Apache and mod_wsgi Apache http://www.apache.org/ Python WSGI adapter for Apache (mod_wsgi) http://code.google.com/p/modwsgi/ Install mod_wsgi on MAC OS $ brew tap homebrew/apache $ brew install mod_wsgi
18. File Permissions ➡ Modify the permissions for Apache $ sudo chown -R :_www tsans ➡ Modify the permissions for Apache $ chmod g+w tsans/tsans $ chmod g+w tsans/tsans/tsans.db $ chmod g+w tsans/tsans/uploads $ find tsans/tsans/uploads -type d -exec chmod g+w {} \; _www for Mac OS www-data for Linux only for SQLite }
19. Collect static files tsans/ static/ HelloYou/ static/ tsans/ static/ WebDirectory/ static/ STATIC_ROOT = os.path.join(PROJECT_PATH, '../static/') tsans/settings.py Configure the static root directory Collect the static file $ python manage.py collectstatic
20. .... LoadModule wsgi_module libexec/apache2/mod_wsgi.so Alias /static/ /project_path/tsans/static/ <Directory /project_path/tsans/static> Order deny,allow Allow from all </Directory> WSGIScriptAlias / /project_path/tsans/tsans/wsgi.py WSGIDaemonProcess example.com python-path=/project_path/tsans:/django_path/site-packages WSGIProcessGroup example.com <Directory /project_path/tsans/tsans> <Files wsgi.py> Order deny,allow Allow from all </Files> </Directory> .... /etc/apache2/httpd.conf Restart Apache $ sudo apachectl restart
21. Reminder : Find your Django Path $ python >> import django >> django.__file__ '/usr/local/lib/python2.7/site-packages/django/__init__.pyc' Find your Django installation path my django_path
22. Debugging the configuration Server error $ cat /var/log/apache2/error_log
 HTTP error $ cat /var/log/apache2/access_log
23. Disable Django debug message (once it’s working) DEBUG = False TEMPLATE_DEBUG = False tsans/settings.py
24. Apache Virtual Hosts http://www.coolestguidesontheplanet.com/downtown/how-set-virtual-hosts-apache-mac-osx-109-mavericks-and-osx-108-mountain-lion
25. Apache Virtual Hosts ➡ Running multiple websites on the same Apache server
26. Configure Apache # Virtual hosts Include /private/etc/apache2/extra/httpd-vhosts.conf /etc/apache2/http.conf Enable virtual hosts <VirtualHost *:80> ServerAdmin webmaster@site1.example.com ServerName site1.example.com ServerAlias www.site1.example.com ErrorLog "/var/log/apache2/site1.example.com-error_log" CustomLog "/var/log/apache2/site1.example.com-access_log" common ****** insert Django apache configuration here ******* </VirtualHost> /etc/apache2/extra/httpd-vhosts.conf Configure a virtual host
27. Spoof your IP address to the domain (for testing) 127.0.0.1 site1.example.com 127.0.0.1 www. site1.example.com /etc/hosts
28. Django and MySQL
29. MySQL MySQL http://www.mysql.com/ Install MySQL on MAC OS https://github.com/SixArm/sixarm_mac_osx_installation_help/blob/master/mysql.md MySQL driver for Python $ pip install MySQL-python Start MySQL $ mysql.server start

30. Create a MySQL database for Django DROP DATABASE IF EXISTS `mydb`; CREATE DATABASE `mydb` DEFAULT CHARACTER SET utf8 DEFAULT COLLATE utf8_general_ci; USE 'mysql'; GRANT ALL PRIVILEGES ON mydb.* TO 'mydb_user'@'localhost' IDENTIFIED BY 'pass4mydb' WITH GRANT OPTION; FLUSH PRIVILEGES; tsans/mysql/init.sql Initialize the MySQL database $ mysql -u root -p < script.sql
31. Configure Django to use MySQL .... DATABASES = { 'default': { 'ENGINE': 'django.db.backends.mysql', 'OPTIONS': { 'read_default_file': os.path.join(BASE_DIR, ‘tsans/mysql/my.cf’), }, } } .... tsans/settings.py [client] database = mydb user = mydb_user password = pass4mydb default-character-set = utf8 tsans/mysql/my.cf
32. Python Virtual Environment http://michal.karzynski.pl/blog/2013/09/14/django-in-virtualenv-on-webfactions-apache-with-mod-wsgi/
33. Python Virtualenv ➡ Running multiple Django applications that have different dependencies of different versions
 $ pip install virtualenv
34. Prerequisite Collect all dependencies $ pip freeze > tsans/REQUIREMENTS.txt
 Cleanup the file by removing unnecessary packages Django==1.5.2 PIL==1.1.7 pysqlite==2.6.3 wsgiref==0.1.2 tsans/virtualenv/REQUIREMENTS.txt
35. Create a virtual environment 1. Create a directory my_app $ mkdir my_app $ cd my_app $ virtualenv my_app 2. Copy (or create) your django app in my_app 3. Activate the environment $ source bin/activate 4. Install the dependencies $ pip install -r tsans/tsans/virtualenv/REQUIREMENTS.txt 5. Configure Apache
36. Deploy on Shared Hosts
37. Github (static hosting) $ git checkout gh-pages
 $ git merge master
 $ git push origin gh-pages $ git branch gh-pages Create the gh-pages branch (first time only) Synchronize gh-pages with master
38. Heroku https://devcenter.heroku.com/articles/deploying-python
39. Google App Engine https://cloud.google.com/appengine/articles/django-nonrel
40. Others https://code.djangoproject.com/wiki/DjangoFriendlyWebHosts
41. Domain Name
42. Internet Top Level Names See List of Internet top-level domains (Wikipedia)
43. How to get a domain name? You need to buy one from a Domain Name Registrar
44. Getting a signed SSL certificate
45. What about Qatar? ✓ A domain name in .qa ➡ See Qatar Domain Registry
46. whois Get information about a website