Question

When trying to upload a file to a dataset in CKAN, I get this error in the web interface:

Failed to get credentials for storage upload. Upload cannot proceed

Answer 1

This error is usually caused either by CKAN’s FileStore not being setup correctly, or the FileStore’s dependencies not being installed correctly. See CKAN’s FileStore and File Uploads documentation.

Make sure that:

• You have pairtree installed in your CKAN virtualenv (pip install pairtree)

• You have argparse installed in your CKAN virtualenv (pip install argparse)

• You have the ofs.impl and ofs.storage_dir options set correctly in the [app:main] section of your CKAN ini file, e.g.:

  ofs.impl = pairtree
  ofs.storage_dir = /mnt/datalocale
  

• Make sure that your ofs.storage_dir directory exists. Run this command in a shell: mkdir -p /path/to/your/ofs/storage/dir.

• Make sure that the operating system user that CKAN runs as (e.g. the user www-data, if you are running CKAN with Apache on Ubuntu) has read and write permissions for the ofs.storage_dir. For example, if you are running CKAN with Apache on Ubuntu, run these commands in the terminal:

  sudo chown www-data /path/to/your/ofs/storage_dir
  sudo chmod u+rwx /path/to/your/ofs/storage_dir
  sudo service apache2 restart
  

If all of the above fails then ask for help, either using this CKAN tag on StackOverflow or the ckan-dev mailing list. When posting, it is useful to include:

• What operating system you’re using
• What version of CKAN you’re using
• How you have deployed CKAN (package install or source install? Apache webserver or paster development install?)
• Your CKAN ini file (with any sensitive details removed)
• Any errors you get from CKAN, either from the terminal where you’re running paster serve ... or, if you’re running CKAN with Apache, from a log file such as /var/log/apache2/YOURSITE.error.log. If you can get us a full Python traceback, this is usually the most useful thing.
• The output of the pip freeze command when run in your CKAN virtualenv.