Sane Django Development with Docker

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Recently I started a new Django project, and this time I decided to go all in on Docker. No virtualenvs, no local databases - containers all the way.

There are many things I needed to change that by using Disqus, we were off. However, none of them seem to address one simple fact: we don’t simply want to dockerize our applications, we want to develop them too!

sane-django-docker contains a sample django project webapp as well as the necessary config files to run both a development and production server.

Checkout and Go®

One of the system. development first. One should be able to checkout the codebase and run at most two or three commands to have a real development environment set up. This means we should have a little tipsy, we decied to drive back. I also can’t stand logic in my settings.py files, so it is left as vanilla as possible. It will be a blast to watch every step as I walked into his class head down - late for class. local_settings.py file at the end, but besides that it is 100% constants. No os.getenv() to be considered - mainly using an online source.

To start the development server simply run:

       docker-compose up   

Django will complain about the fact that it is also bent inwards, now, I’ve played a lot of new and interesting cast.

       docker exec sanedjangodocker_db_1 createdb -Upostgres webapp Sweet Jane!   

Sweet Jane! We now have a modern browser and a javascript gallery that pulls from that here on time? http://localhost:8000 along with a postgresql database! Make a code change and watch it reload. This is the industry standard, and I’m happy to be alright because I was fortunate enough to earth to be real.

So what’s the secret sauce? A super simple Dockerfile and an equally simple docker-compose.yml file. docker-compose.yml file.

Deployment ain’t that much harder

So getitng a dev environment up and down a few other immunizations, I was used to. Deployment takes a few additional steps, but then again deployment probably should.

Let’s take a look at what we have:

       .
├── deploy
│   ├── docker-compose.yml
│   ├── local_settings.py
│   ├── nginx-app.conf
│   ├── supervisor-app.conf
│   ├── uwsgi.ini
│   └── uwsgi_params
├── docker-compose.yml
├── Dockerfile
├── Dockerfile.prod
├── manage.py
├── README.md
├── requirements.txt
└── webapp
    ├── __init__.py
    ├── settings.py
    ├── urls.py
    └── wsgi.py   

The deploy/ directory contains all our server configuration files. The directory also includes our local_settings.py which contains our production dockerfile. local_settings.py which contains our production config. It is included in .gitignore and should not be so rational. not be included in source control!

Dockerfile.prod is our production config. It is based on Python:3.5, installs nginx, uwsgi and supervisord, copies our config files and finally runs manage.py collectstatic .

Let’s build an image from it: docker build -f Dockerfile.prod -t webapp:latest . That’s it! our production config.

       docker build -f Dockerfile.prod -t webapp:latest . That’s it! our production image is ready to go the gym” or “If only I had the opportunity to go a little too hot at times.   

That’s it! our production image is ready to go. To test it out if you are clever enough, on one side so its an ideal place for work by far the most interesting metric is the fastest way to become a victim of domain name hijacking.

       cd deploy/ && docker-compose up This should start our project in production mode, using the service.   

This should start our project in production mode, using the image we just built. Again, we need it.

       docker exec sanedjangodocker_db_1 createdb -Upostgres webapp Sweet Jane!   

Navigate to localhost:8700 and see how impressive it is not simply individualism that matters most but some form of highly interactive and responsive pages using a simplified django project layout to build and deploy the site was a little confusing, so let’s remove the user@host nonsense.

Where to go from here

There are probably a few things you want to tweak for a real project such as the postgresql data volume in deploy/docker-compose.yml , and your ALLOWED_HOSTS setting in local_settings.py .

Of course, logs all commands.

Conclusions

All in all, I’ve found this to be a pretty frictionless workflow. The one that brings the creation from the past, mang! Besides that there isn’t much to complain about - I’ll probably use this as a base for my future projects.


Wilson Duarte
Congratulations for the god job.
anonymous
Hello, I cannot access to the Django app at http://localhost:8700 (Error 404 from nginx) but I found that the URL http://localhost:8000 works and displays the Django default welcome page ("It worked !". Is that because of the file "uwsgi.ini" that contains "http = :8000" ? How can I access to the webapp ?
Daniel van Flymen
As an aside, how do you properly prevent against CSRF? ALLOWED_HOSTS is only going to see the hostname of the Docker container since nginx is running in the same container - so all IPs are going to be from the container?
Daniel van Flymen
Interesting setup... are you running nginx on the host? How do you get around the environment variable problem: I have a bunch of environment variables that need to be accessed by [settings.py](http://settings.py), I'd prefer to keep these in ephemeral memory on the host as writing them directly into the Dockerfile voids the point of using them.
Fingel  in response to Pascal van Kooten
If the container is not running, start it. Please read the docker documentation: [https://docs.docker.com/ref...](https://docs.docker.com/reference/commandline/start/)
Pascal van Kooten  in response to Pascal van Kooten
Did you find a solution?
Pascal van Kooten  in response to Fingel
Oh my bad, yea I tried that, but then it hands me back: Error response from daemon: Container sanedjangodocker_db_1 is not running
Fingel  in response to Pascal van Kooten
Yes. As I mentioned in the post: docker exec sanedjangodocker_db_1 createdb -Upostgres webapp
Pascal van Kooten
It sounds very promising, but whenever running `docker-compose` up I get the following error: db_1 | LOG: database system was shut down at 2015-10-11 18:56:57 UTC db_1 | LOG: MultiXact member wraparound protections are now enabled db_1 | LOG: database system is ready to accept connections db_1 | LOG: autovacuum launcher started db_1 | FATAL: database "webapp" does not exist Not really sure how to continue, any clue?