Django Deployment-in-AWS

Django Deployment
Best Practices
Presenter: Premananda Das, Mindfire Solutions
Date: 05/02/2015

About me
Connect Me:
Facebook: https://www.facebook.com/premanandad
Linkedin: https://in.linkedin.com/pub/premananda-das/1a/353/454
Twitter: https://twitter.com/premananda
Google+: https://plus.google.com/117290494758487835690
Contact Me:
Email: premanandad@mindfiresolutions.com / premanandad@gmail.com
Skype: mfsi_prem
Zend PHP Certified and Zend Framework Certified developer.
Skills: PHP, Python, Zend Framework, CodeIgniter, CakePHP, Django,
JavaScript, jQuery,
Mysql, Postgresql, AWS.

Agenda
Environment setup
Server configuration
Tools
Demo: Deploying in AWS
Q&A

Environment setup
pip
Virtualenv and Virtualenvwrapper
Django setup
requirements.txt
git
Supervisord

Environment setup > pip
Its a tool for installing Python packages from PyPI.
Install: sudo apt-get install python-pip
Example:
$ pip install PackageName # latest version
$ pip install PackageName ==1.0.4 # specific version
$ pip install PackageName >=1.0.4' # minimum version
$ pip uninstall PackageName

Environment setup > Virtualenv
A tool to create isolated Python environments.
$ pip install virtualenv
Example:
Create Environment: $ virtualenv venv
Activate Environment: $ source venv/bin/activate
Install Packages: $ pip install requests
Deactivate Environment: $ deactivate
Virtualenvwrapper is a set of extensions to virtualenv tool. It
provides commands to make it easy to work with virtualenv.
Create virtual environment: mkvirtualenv mynewenv
List virtual environment: lsvirtualenv
Remove a virtual environment: rmvirtualenv myenv

Environment setup > Django
Install: $ pip install django
New project: $ django-admin.py startproject myproject
1. Keep the app name concise - simple and one word.
2. Use flake8 to check coding convention - PEP8.
3. django-dotenv - avoid using local_settings.py.
4. Error handling and logging: logger - error and exception with log rotate.
5. DEBUG = False.
6. DB log error and analyse slow queries.
7. django-debug-toolbar for debugging.
8. Don’t reinvent the wheel.

Environment setup > requirements.txt
$ pip freeze > requirements.txt
$ pip install -r requirements.txt

Environment setup > git
Ubuntu: sudo apt-get install git
1. Working directory must be kept clean.
2. All files should be committed to git.
3. Server configs can be kept in git.
4. Don’t keep any application and database password in git.
5. Follow process: Gitflow Workflow

Environment setup > git > Gitflow
Workflow

Environment setup > Supervisord
A Process Control System
Install:
pip: pip install supervisor —pre
Ubuntu: sudo apt-get install supervisor
Config:
echo_supervisord_conf > /etc/supervisord.conf
$ sudo supervisorctl reload
$ sudo supervisorctl restart uwsgi

Environment setup > Supervisord
#/etc/supervisor/conf.d/uwsgi.conf
[program:uwsgi]
command=/home/ubuntu/.virtualenvs/venv/bin/uwsgi --ini
/home/ubuntu/myproject/system/uwsgi/uwsgi.ini
directory=/home/ubuntu/myproject
user=www-data
autostart=true
autorestart=true
redirect_stderr=true
stopsignal=QUIT
stopasgroup=true
killasgroup=true

Server configuration
> Nginx
> uWSGI
The world’s busiest websites use

Server configuration:

Server configuration > uWSGI
Install: $ pip install uwsgi
Supervisord conf:
[program:uwsgi]
command=/home/ubuntu/.virtualenvs/venv/bin/uwsgi --ini
/home/ubuntu/myproject/system/uwsgi.ini
directory=/home/ubuntu/myproject
user=www-data
autostart=true
autorestart=true
redirect_stderr=true
stopsignal=QUIT
stopasgroup=true
killasgroup=true

Server configuration > uWSGI
[uwsgi]
chdir = /home/ubuntu/myproject
module = myproject.wsgi
# the virtualenv (full path)
home = /home/ubuntu/.virtualenvs/venv/
#logger = file:/home/ubuntu/myproject/log/uwsgi.log
# process-related settings
master = true
# maximum number of worker processes
processes = 3
# the socket (use the full path to be safe)
socket = /tmp/myproject.sock
chmod-socket = 666
# clear environment on exit
vacuum = true

Server configuration > Nginx
Install: sudo apt-get install nginx
Process:
Start: sudo service nginx start
Stop: sudo service nginx stop
Check Status: sudo service nginx status
Restart: sudo service nginx restart
Server Config:
/etc/nginx/sites-enabled/web-http.conf
server {
listen 80;
server_name myserver.com;
return 301 https://$server_name$request_uri;
}

Server configuration > nginx
/etc/nginx/sites-enabled/web-https.conf
server {
listen 443;
server_name myserver.com;
root /home/ubuntu/myproject/static;
client_max_body_size 4G;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
ssl on;
ssl_certificate /etc/nginx/ssl/certs/bundle.crt;
ssl_certificate_key /etc/nginx/ssl/certs/myserver_com.key;
ssl_session_timeout 5m;
ssl_protocols SSLv3 TLSv1;
ssl_ciphers
ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv3:+EXP;
ssl_prefer_server_ciphers on;
Continued…

Server configuration > nginx
location / {
uwsgi_pass django;
include /home/ubuntu/myproject/system/uwsgi/uwsgi_params;
}
location /static/ {
alias /home/ubuntu/myproject/myproject/static/;
}
}
upstream django {
server unix:///tmp/guinness.sock; # for a file socket
}
uwsgi_params:
uwsgi_param QUERY_STRING $query_string;
uwsgi_param REQUEST_METHOD $request_method;
uwsgi_param CONTENT_TYPE $content_type;
uwsgi_param CONTENT_LENGTH $content_length;
uwsgi_param REQUEST_URI $request_uri;
uwsgi_param PATH_INFO $document_uri;
uwsgi_param DOCUMENT_ROOT $document_root;
uwsgi_param SERVER_PROTOCOL $server_protocol;
uwsgi_param HTTPS $https if_not_empty;
uwsgi_param REMOTE_ADDR $remote_addr;
uwsgi_param REMOTE_PORT $remote_port;
uwsgi_param SERVER_PORT $server_port;
uwsgi_param SERVER_NAME $server_name;

Tools
1. New Relic: Server and application monitoring
2. Sentry: Gives insight into the application errors
3. Jenkins for CI, unittest
4. Fabric: Application deployment or system administration tasks
over SSH.

Demo > Deploying in
AWS

Any Questions?

References Link
pip: https://pip.pypa.io/en/latest/reference/pip_install.html
git: https://www.atlassian.com/git/tutorials/comparing-workflows/gitflow-
workflow
virtualenvwrapper: http://virtualenvwrapper.readthedocs.org/en/latest/
uwsgi: http://uwsgi-
docs.readthedocs.org/en/latest/tutorials/Django_and_nginx.html
Supervisord: http://supervisord.org/installing.html
nginx: http://nginx.com/
uWSGI+nginx: https://www.digitalocean.com/community/tutorials/how-to-
deploy-python-wsgi-applications-using-uwsgi-web-server-with-nginx
Sentry: https://getsentry.com/welcome/
New Relic: http://newrelic.com/

Thank You !!

www.mindfiresolutions.com
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http://www.linkedin.com/company/mindfire-solutions
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