Open edX development¶
In addition to running Open edX in production, Tutor can be used for local development of Open edX. This means that it is possible to hack on Open edX without setting up a Virtual Machine. Essentially, this replaces the devstack provided by edX.
The following commands assume you have previously launched a local Open edX platform. If you have not done so already, you should run:
tutor local quickstart
In order to run the platform in development mode, you must answer no (“n”) to the question “Are you configuring a production platform”.
Once the local platform has been configured, you should stop it so that it does not interfere with the development environment:
tutor local stop
Finally, you should build the
openedx-dev docker image:
tutor images build openedx-dev
openedx-dev development image differs from the
openedx production image:
The user that runs inside the container has the same UID as the user on the host, in order to avoid permission problems inside mounted volumes (and in particular in the edx-platform repository).
The edx-platform development requirements are installed.
openedx-dev is based upon the
openedx docker image, it should be re-built every time the
openedx docker image is modified.
Run a local development webserver¶
tutor dev runserver lms # Access the lms at http://local.overhang.io:8000 tutor dev runserver cms # Access the cms at http://studio.local.overhang.io:8001
Running arbitrary commands¶
To run any command inside one of the containers, run
tutor dev run [OPTIONS] SERVICE [COMMAND] [ARGS].... For instance, to open a bash shell in the LMS or CMS containers:
tutor dev run lms bash tutor dev run cms bash
To open a python shell in the LMS or CMS, run:
tutor dev run lms ./manage.py lms shell tutor dev run cms ./manage.py cms shell
You can then import edx-platform and django modules and execute python code.
To collect assets, you can use the
openedx-assets command that ships with Tutor:
tutor dev run lms openedx-assets build --env=dev
Bind-mount container directories¶
It may sometimes be convenient to mount container directories on the host, for instance: for editing and debugging. Tutor provides different solutions to this problem.
Bind-mount from the “volumes/” directory¶
Tutor makes it easy to create a bind-mount from an existing container. First, copy the contents of a container directory with the
bindmount command. For instance, to copy the virtual environment of the “lms” container:
tutor dev bindmount lms /openedx/venv
This command recursively copies the contents of the
/opendedx/venv directory to
$(tutor config printroot)/volumes/venv. The code of any Python dependency can then be edited – for instance, you can then add a
import ipdb; ipdb.set_trace() statement for step-by-step debugging, or implement a custom feature.
Then, bind-mount the directory back in the container with the
tutor dev runserver --volume=/openedx/venv lms
Notice how the
--volume=/openedx/venv option differs from Docker syntax? Tutor recognizes this syntax and automatically converts this option to
--volume=/path/to/tutor/root/volumes/venv:/openedx/venv, which is recognized by Docker.
bindmount command and the
--volume=/... option syntax are available both for the
tutor local and
tutor dev commands.
Manual bind-mount to any directory¶
The above solution may not work for you if you already have an existing directory, outside of the “volumes/” directory, which you would like mounted in one of your containers. For instance, you may want to mount your copy of the edx-platform repository. In such cases, you can simply use the
-v/--volume Docker option:
tutor dev run --volume=/path/to/edx-platform:/openedx/edx-platform lms bash
Override docker-compose volumes¶
The above solutions require that you explicitly pass the
-v/--volume to every
runserver command, which may be inconvenient. Also, these solutions are not compatible with the
start command. To address these issues, you can create a
docker-compose.override.yml file that will specify custom volumes to be used with all
vim "$(tutor config printroot)/env/dev/docker-compose.override.yml"
You are then free to bind-mount any directory to any container. For instance, to mount your own edx-platform fork:
version: "3.7" services: lms: volumes: - /path/to/edx-platform/:/openedx/edx-platform cms: volumes: - /path/to/edx-platform/:/openedx/edx-platform lms-worker: volumes: - /path/to/edx-platform/:/openedx/edx-platform cms-worker: volumes: - /path/to/edx-platform/:/openedx/edx-platform
This override file will be loaded when running any
tutor dev .. command. The edx-platform repo mounted at the specified path will be automatically mounted inside all LMS and CMS containers. With this file, you should no longer specify the
-v/--volume option from the command line with the
tutor local commands loads the
docker-compose.override.yml file from the
$(tutor config printroot)/env/local/docker-compose.override.yml directory.
Point to a local edx-platform¶
# Mount from the volumes/ directory tutor dev bindmount lms /openedx/edx-platform tutor dev runserver --volume=/openedx/edx-platform lms # Mount from an arbitrary directory tutor dev runserver --volume=/path/to/edx-platform:/openedx/edx-platform lms # Add your own volumes to $(tutor config printroot)/env/dev/docker-compose.override.yml tutor dev runserver lms
Prepare the edx-platform repo¶
If you choose any but the first solution above, you will have to make sure that your fork works with Tutor.
First of all, you should make sure that you are working off the
open-release/koa.3 tag. See the fork edx-platform section for more information.
Then, you should run the following commands:
# Run bash in the lms container tutor dev run [--volume=...] lms bash # Compile local python requirements pip install --requirement requirements/edx/development.txt # Install nodejs packages in node_modules/ npm install # Rebuild static assets openedx-assets build --env=dev
To debug a local edx-platform repository, add a
import ipdb; ipdb.set_trace() breakpoint anywhere in your code and run:
tutor dev runserver [--volume=...] lms
XBlock and edx-platform plugin development¶
In some cases you will have to develop features for packages that are pip-installed next to edx-platform. This is quite easy with Tutor. Just add your packages to the
$(tutor config printroot)/env/build/openedx/requirements/private.txt file. To avoid re-building the openedx Docker image at every change, you should add your package in editable mode. For instance:
echo "-e ./mypackage" >> "$(tutor config printroot)/env/build/openedx/requirements/private.txt"
requirements folder should have the following content:
env/build/openedx/requirements/ private.txt mypackage/ setup.py ...
You will have to re-build the openedx Docker image once:
tutor images build openedx
You should then run the development server as usual, with
runserver. Every change made to the
mypackage folder will be picked up and the development server will be automatically reloaded.
With Tutor, it’s pretty easy to develop your own themes. Start by placing your files inside the
env/build/openedx/themes directory. For instance, you could start from the
edx.org theme present inside the
cp -r /path/to/edx-platform/themes/edx.org "$(tutor config printroot)/env/build/openedx/themes/"
You should not create a soft link here. If you do, it will trigger a
Theme not found in any of the themes dirs error. This is because soft links are not properly resolved from inside docker containers.
Then, run a local webserver:
tutor dev runserver lms
tutor dev settheme mythemename local.overhang.io:8000 studio.local.overhang.io:8001
Re-build development docker image (and compile assets):
tutor images build openedx-dev
Watch the themes folders for changes (in a different terminal):
tutor dev run watchthemes
Make changes to some of the files inside the theme directory: the theme assets should be automatically recompiled and visible at http://local.overhang.io:8000.
Custom edx-platform settings¶
By default, tutor settings files are mounted inside the docker images at
/openedx/edx-platform/cms/envs/tutor/. In the various
dev commands, the default
edx-platform settings module is set to
tutor.development and you don’t have to do anything to set up these settings.
If, for some reason, you want to use different settings, you will need to define the
TUTOR_EDX_PLATFORM_SETTINGS environment variable.
For instance, let’s assume you have created the
/path/to/edx-platform/cms/envs/mysettings.py modules. These settings should be pretty similar to the following files:
$(tutor config printroot)/env/apps/openedx/tutor/lms/development.py $(tutor config printroot)/env/apps/openedx/tutor/cms/development.py
mysettings.py files can import the tutor development settings:
# Beginning of mysettings.py from .tutor.development import *
You should then specify the settings to use on the host:
From then on, all
dev commands will use the
mysettings module. For instance:
tutor dev runserver lms
Running edx-platform unit tests¶
It’s possible to run the full set of unit tests that ship with edx-platform. To do so, you should first build the “test” target of the “openedx-dev” Docker image:
tutor images build --target=test openedx-dev
Don’t forget to re-build the development image afterwards if you’d like to run
dev commands again! To do so, run
tutor images build openedx-dev after you are done testing.
Then, run unit tests with
# Run a test container tutor dev run lms bash # Run tests on common apps unset DJANGO_SETTINGS_MODULE export EDXAPP_TEST_MONGO_HOST=mongodb pytest common pytest openedx # Run tests on LMS export DJANGO_SETTINGS_MODULE=lms.envs.tutor.test pytest lms # Run tests on CMS export DJANGO_SETTINGS_MODULE=cms.envs.tutor.test pytest cms
Getting all edx-platform unit tests to pass on Tutor is currently a work-in-progress. Some unit tests are still failing. If you manage to fix some of these, please report your findings in the Tutor forums.