ValueError: Key cannot be the null string - django-admin.py syncdb --migrate

[Daniel Townend]

I've set up a mysql database and user and everything is correct in the config file. But when I run 'django-admin.py syncdb --migrate' to initialise the database I get the following error,

Traceback (most recent call last):

  File "/opt/ganeti_webmgr/bin/django-admin.py", line 5, in <module>

    management.execute_from_command_line()

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line

    utility.execute()

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 261, in fetch_command

    klass = load_command_class(app_name, subcommand)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 69, in load_command_class

    module = import_module('%s.management.commands.%s' % (app_name, name))

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module

    __import__(name)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/south/management/commands/__init__.py", line 10, in <module>

    import django.template.loaders.app_directories

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django/template/loaders/app_directories.py", line 21, in <module>

    mod = import_module(app)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module

    __import__(name)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/haystack/__init__.py", line 154, in <module>

    handle_registrations()

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/haystack/__init__.py", line 151, in handle_registrations

    search_sites_conf = importlib.import_module(settings.HAYSTACK_SITECONF)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module

    __import__(name)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/ganeti_webmgr/search_sites.py", line 2, in <module>

    haystack.autodiscover()

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/haystack/__init__.py", line 121, in autodiscover

    importlib.import_module("%s.search_indexes" % app)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module

    __import__(name)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/ganeti_webmgr/ganeti_web/search_indexes.py", line 3, in <module>

    from ganeti_webmgr.virtualmachines.models import VirtualMachine

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/ganeti_webmgr/virtualmachines/models.py", line 5, in <module>

    from ganeti_webmgr.clusters.models import CachedClusterObject

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/ganeti_webmgr/clusters/models.py", line 297, in <module>

    class Cluster(CachedClusterObject):

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/ganeti_webmgr/clusters/models.py", line 309, in Cluster

    max_length=128, blank=True)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/django_fields/fields.py", line 50, in __init__

    self.cipher = self.cipher_object.new(settings.SECRET_KEY[:32])

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/Crypto/Cipher/AES.py", line 95, in new

    return AESCipher(key, *args, **kwargs)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/Crypto/Cipher/AES.py", line 59, in __init__

    blockalgo.BlockAlgo.__init__(self, _AES, key, *args, **kwargs)

  File "/opt/ganeti_webmgr/local/lib/python2.7/site-packages/Crypto/Cipher/blockalgo.py", line 141, in __init__

    self._cipher = factory.new(key, *args, **kwargs)

ValueError: Key cannot be the null string

Am I being stupid and missing something obvious?

[Evan Tschuy]

That error generally means that either the WEB_MGR_API_KEY or the
SECRET_KEY isn't set to anything.

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[Daniel Townend]

They both exist in .secret and have a generated random key in both files?

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[Evan Tschuy]

Ah, ok. I think I've found the issue -- it turns out that there's a
bug in loading the credentials after they've been generated.

For now, if you're using a custom settings.py or config.yml file, you
can define SECRET_KEY or WEB_MGR_API_KEY in there and that should
work. I'm also going to get a fix pushed that you'll be able to use;
that should be available later today my time.

Thanks for the bug report!

Evan

[Evan Tschuy]

A fix is available in the develop branch. There are a few more changes
I want to make before we cut a new release, but there's no breaking
changes.

https://github.com/osuosl/ganeti_webmgr/tree/develop

[Daniel Townend]

That great Evan, thanks for your help :)

[Daniel Townend]

I'm still getting the error after switching branches. Here are the commands I'm running, am I missing something?

apt-get install python-dev libffi-dev libmysqlclient-dev mysql-server -y

cd ~ && git clone -b develop https://github.com/osuosl/ganeti_webmgr.git

cd ganeti_webmgr

VERSION="0.11.1"

git checkout $VERSION

./scripts/setup.sh -D mysql

cp ~/ganeti_webmgr/scripts/vncauthproxy/init-ubuntu /etc/init.d/vncauthproxy

pip install service_identity

cp /root/ganeti_webmgr/ganeti_webmgr/ganeti_web/settings/config.yml.dist /opt/ganeti_webmgr/config/config.yml

# Set up database

mysql

CREATE DATABASE ganeti_webmgr;

CREATE USER 'ganeti_webmgr'@'localhost' IDENTIFIED BY '<password>';

GRANT ALL PRIVILEGES ON ganeti_webmgr.* TO 'ganeti_webmgr'@'localhost';

FLUSH PRIVILEGES;

exit

vi /opt/ganeti_webmgr/config/config.yml

# Finish configuring

source /opt/ganeti_webmgr/bin/activate

export DJANGO_SETTINGS_MODULE="ganeti_webmgr.ganeti_web.settings"

django-admin.py $CMD --settings "ganeti_webmgr.ganeti_web.settings"

(ganeti_webmgr)root@ganetiweb:~# django-admin.py syncdb --migrate

[Evan Tschuy]

Looks like you're checking out 0.11.1 after you clone onto develop,
and 0.11.1 doesn't contain the fix.

I ran through the rest of your setup process and everything appears to
work other than that. (You may need to change the language code from
en-US to en_US, however.)

[Daniel Townend]

Okay thanks. Might sound like a stupid question but how do I check what versions are in what branches?

[Evan Tschuy]

In general we have release/0.major.minor release branches, and the
latest version available version is 0.11.1. We're preparing some
changes for the next release and this fix will be included in that
release. For now, since it isn't a release yet, it's only available on
develop.

We don't bump the version on releases until just before we actually
cut the release, but to see what version a branch is building from,
you can look in ganeti_webmgr/ganeti_web/constants.py:
https://github.com/osuosl/ganeti_webmgr/blob/develop/ganeti_webmgr/ganeti_web/constants.py#L18