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CKAN configuration settings available from env vars

Project description


This CKAN extension checks for environmental variables conforming to an expected format and updates the corresponding CKAN config settings with its value.

For the extension to correctly identify which env var keys map to the format used for the config object, env var keys should be formatted in the following way:

  1. All uppercase
  2. Replace periods (‘.’) with two underscores (‘__’)
  3. Keys must begin with ‘CKAN’ or ‘CKANEXT’

Some examples:

ckan.site_id --> CKAN__SITE_ID
ckanext.s3filestore.aws_bucket_name --> CKANEXT__S3FILESTORE__AWS_BUCKET_NAME

For keys that don’t normally begin with ‘CKAN’, add ‘CKAN___’ (3 underscores) to the beginning to help the extension identify these keys, e.g.:

sqlalchemy.url --> CKAN___SQLALCHEMY__URL
beaker.session.secret --> CKAN___BEAKER__SESSION__SECRET


Tested in CKAN 2.3 and 2.4.0, but may work in previous versions.

To ensure all config settings are overridden by env var values, envvars must be the last plugin entry in the ckan.plugins list (see ‘Installation’ below).


To install ckanext-envvars:

  1. Activate your CKAN virtual environment, for example:

    . /usr/lib/ckan/default/bin/activate
  2. Install the ckanext-envvars Python package into your virtual environment:

    pip install ckanext-envvars
  3. Add envvars to the ckan.plugins setting in your CKAN config file (by default the config file is located at /etc/ckan/default/production.ini).

  4. Restart CKAN. For example if you’ve deployed CKAN with Apache on Ubuntu:

    sudo service apache2 reload

Development Installation

To install ckanext-envvars for development, activate your CKAN virtualenv and do:

git clone
cd ckanext-envvars
python develop
pip install -r dev-requirements.txt

Running the Tests

To run the tests, do:

nosetests --nologcapture --with-pylons=test.ini

To run the tests and produce a coverage report, first make sure you have coverage installed in your virtualenv (pip install coverage) then run:

nosetests --nologcapture --with-pylons=test.ini --with-coverage --cover-package=ckanext.envvars --cover-inclusive --cover-erase --cover-tests

Registering ckanext-envvars on PyPI

ckanext-envvars should be availabe on PyPI as If that link doesn’t work, then you can register the project on PyPI for the first time by following these steps:

  1. Create a source distribution of the project:

    python sdist
  2. Register the project:

    python register
  3. Upload the source distribution to PyPI:

    python sdist upload
  4. Tag the first release of the project on GitHub with the version number from the file. For example if the version number in is 0.0.1 then do:

    git tag 0.0.1
    git push --tags

Releasing a New Version of ckanext-envvars

ckanext-envvars is availabe on PyPI as To publish a new version to PyPI follow these steps:

  1. Update the version number in the file. See PEP 440 for how to choose version numbers.

  2. Create a source distribution of the new version:

    python sdist
  3. Upload the source distribution to PyPI:

    python sdist upload
  4. Tag the new release of the project on GitHub with the version number from the file. For example if the version number in is 0.0.2 then do:

    git tag 0.0.2
    git push --tags

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