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Deploy Django projects using git push

Deploying stuff in one command is becoming the Holy Grail of development, with currently ten times more blog articles than Medieval crusades :)

I could not miss the opportunity to write mine !

Disclaimer: In order to keep this article as clear (and short) as possible, the first step setup on a blank server does not use any provisionning system (another religious matter).

Prerequesites : easy dependencies

Having a simple Makefile for your application is highly recommended, it will gather all repetitive commands for setting up dependencies.

Here is a minimalist (working) example, with a project called revolution

install: bin/python

    virtualenv .
    bin/python develop

serve: bin/python
    bin/python ./ runserver 8888

deploy: bin/python
    bin/python ./ collectstatic --clear --noinput
    touch revolution/  # trigger reload

    rm -rf bin/ lib/ build/ dist/ *.egg-info/ include/ local/

If your project does have any, just write one [1] or use a requirements.txt file [2] and replace bin/python develop in Makefile with bin/pip install -r requirements.txt.

Now you can then run your deployment commands with make deploy.

First step : server setup

Prepare repository

On your server, create two folders : the repository and deployed app.

mkdir -p /var/git/yourapp.git
mkdir -p /var/www/yourapp

The Git repository will serve as a remote for our code.

cd /var/git/yourapp.git
git init --bare .

Using Git hooks, we will deploy the code being pushed into the deployed app folder. Create the file hooks/post-receive with the following content

echo "Deploying into $dest"
GIT_WORK_TREE=$dest git checkout --force
cd $dest
make deploy

And make it executable

chmod +x /var/git/yourapp.git/hooks/post-receive

Setup Web server

Again, in order to make this straight to the point, I will use Apache's mod_wsgi, since the configuration is trivial.

Of course, nginx, gunicorn, uwsgi or circus still belong to our prefered stacks but currently our main point is deploying with git push !

sudo apt-get install libapache2-mod-wsgi

Create a very simple Apache configuration file in /etc/apache2/sites-available/001-yourapp

WSGIPythonPath /var/www/yourapp:/var/www/yourapp/lib/python2.6/site-packages

<VirtualHost *:80>

    Alias /static/ /var/www/yourapp/public/static/
    <Directory /var/www/yourapp/public/static>
        Order deny,allow
        Allow from all

    WSGIScriptAlias / /var/www/yourapp/revolution/
    <Directory /var/www/yourapp/revolution/>
            Order deny,allow
            Allow from all

And enable it

sudo a2ensite 001-yourapp
sudo /etc/init.d/apache2 restart

Your site is now up and running...

Next steps : push updates !

Now that the application is in production, you will obviously want to push updates !

Comfortably installed at your desk, you just have to push commits to the server, the same way you already do for your code !

Add the remote (once)

$ git remote add production ssh://user@server:/var/git/yourapp.git

And push !

$ git push production master

Counting objects: 862, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (437/437), done.
Writing objects: 100% (817/817), 121.16 KiB, done.
Total 817 (delta 608), reused 452 (delta 332)
remote: Deploying into /var/www/yourapp
remote: bin/python develop
remote: 345 static files copied.
To server:/var/git/yourapp.git
   2fe81f4..76a3fb8  master -> master

Your site is up-to-date ! Depending of course of caching policies, but it runs the last version.

Obviously, it is very likely that you will want to push specific branches, but that, you already know!


Comments !