cookiecutter-django/docs/developing-locally-docker.rst

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Getting Up and Running Locally With Docker
==========================================
.. index:: Docker
The steps below will get you up and running with a local development environment.
All of these commands assume you are in the root of your generated project.
Prerequisites
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-------------
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You'll need at least Docker 1.10.
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If you don't already have it installed, follow the instructions for your OS:
- On Mac OS X, you'll need `Docker for Mac`_
- On Windows, you'll need `Docker for Windows`_
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- On Linux, you'll need `docker-engine`_
.. _`Docker for Mac`: https://docs.docker.com/engine/installation/mac/
.. _`Docker for Windows`: https://docs.docker.com/engine/installation/windows/
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.. _`docker-engine`: https://docs.docker.com/engine/installation/
Attention Windows users
-------------
Currently PostgreSQL (``psycopg2`` python package) is not installed inside Docker containers for Windows users, while it is required by the generated Django project. To fix this, add ``psycopg2`` to the list of requirements inside ``requirements/base.txt``::
# Python-PostgreSQL Database Adapter
psycopg2==2.6.2
Doing this will prevent the project from being installed in an Windows-only environment (thus without usage of Docker). If you want to use this project without Docker, make sure to remove ``psycopg2`` from the requirements again.
Build the Stack
---------------
This can take a while, especially the first time you run this particular command
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on your development system::
$ docker-compose -f dev.yml build
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If you want to build the production environment you don't have to pass an argument -f, it will automatically use docker-compose.yml.
Boot the System
---------------
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This brings up both Django and PostgreSQL.
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The first time it is run it might take a while to get started, but subsequent
runs will occur quickly.
Open a terminal at the project root and run the following for local development::
$ docker-compose -f dev.yml up
You can also set the environment variable ``COMPOSE_FILE`` pointing to ``dev.yml`` like this::
$ export COMPOSE_FILE=dev.yml
And then run::
$ docker-compose up
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Running management commands
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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As with any shell command that we wish to run in our container, this is done
using the ``docker-compose run`` command.
To migrate your app and to create a superuser, run::
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$ docker-compose -f dev.yml run django python manage.py migrate
$ docker-compose -f dev.yml run django python manage.py createsuperuser
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Here we specify the ``django`` container as the location to run our management commands.
Add your Docker development server IP
------------------------------------
When ``DEBUG`` is set to `True`, the host is validated against ``['localhost', '127.0.0.1', '[::1]']``. This is adequate when running a ``virtualenv``. For Docker, in the ``config.settings.local``, add your host development server IP to ``INTERNAL_IPS`` or ``ALLOWED_HOSTS`` if the variable exists.
Production Mode
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~~~~~~~~~~~~~~~
Instead of using `dev.yml`, you would use `docker-compose.yml`.
Other Useful Tips
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-----------------
Make a machine the active unit
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This tells our computer that all future commands are specifically for the dev1 machine.
Using the ``eval`` command we can switch machines as needed.
::
$ eval "$(docker-machine env dev1)"
Detached Mode
~~~~~~~~~~~~~
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If you want to run the stack in detached mode (in the background), use the ``-d`` argument:
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::
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$ docker-compose -f dev.yml up -d
Debugging
~~~~~~~~~~~~~
ipdb
"""""
If you are using the following within your code to debug:
::
import ipdb; ipdb.set_trace()
Then you may need to run the following for it to work as desired:
::
$ docker-compose run -f dev.yml --service-ports django
django-debug-toolbar
""""""""""""""""""""
In order for django-debug-toolbar to work with docker you need to add your docker-machine ip address (the output of `Get the IP ADDRESS`_) to INTERNAL_IPS in local.py
.. May be a better place to put this, as it is not Docker specific.
You may need to add the following to your css in order for the django-debug-toolbar to be visible (this applies whether Docker is being used or not):
.. code-block:: css
/* Override Bootstrap 4 styling on Django Debug Toolbar */
#djDebug[hidden], #djDebug [hidden] {
display: block !important;
}
#djDebug [hidden][style='display: none;'] {
display: none !important;
}
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Using the Mailhog Docker Container
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In development you can (optionally) use MailHog_ for email testing. If you selected `use_docker`, MailHog is added as a Docker container. To use MailHog:
1. Make sure, that ``mailhog`` docker container is up and running
2. Open your browser and go to ``http://127.0.0.1:8025``
.. _Mailhog: https://github.com/mailhog/MailHog/