Comment 0 for bug 1216019

/etc/openstack-dashboard/local_settings.py defines Horizon's SECRET_KEY as:

SECRET_KEY = secret_key.generate_or_read_from_file(os.path.join(LOCAL_PATH, '.secret_key_store'))

since LOCAL_PATH is '/usr/share/openstack-dashboard/openstack_dashboard/local', it tries to write a file in that directory. This results in an error when running Horizon:

...
[Fri Aug 23 12:24:34 2013] [error] [client 192.168.122.1] File "/usr/share/openstack-dashboard/openstack_dashboard/wsgi/../../openstack_dashboard/local/local_settings.py", line 92,
 in <module>
[Fri Aug 23 12:24:34 2013] [error] [client 192.168.122.1] SECRET_KEY = secret_key.generate_or_read_from_file(os.path.join(LOCAL_PATH, '.secret_key_store'))
[Fri Aug 23 12:24:34 2013] [error] [client 192.168.122.1] File "/usr/lib/python2.7/dist-packages/horizon/utils/secret_key.py", line 55, in generate_or_read_from_file
[Fri Aug 23 12:24:34 2013] [error] [client 192.168.122.1] with lock:
[Fri Aug 23 12:24:34 2013] [error] [client 192.168.122.1] File "/usr/lib/python2.7/dist-packages/lockfile.py", line 223, in __enter__
[Fri Aug 23 12:24:34 2013] [error] [client 192.168.122.1] self.acquire()
[Fri Aug 23 12:24:34 2013] [error] [client 192.168.122.1] File "/usr/lib/python2.7/dist-packages/lockfile.py", line 239, in acquire
[Fri Aug 23 12:24:34 2013] [error] [client 192.168.122.1] raise LockFailed("failed to create %s" % self.unique_name)
[Fri Aug 23 12:24:34 2013] [error] [client 192.168.122.1] LockFailed: failed to create /usr/share/openstack-dashboard/openstack_dashboard/local/xyz.MainThread-13731

Workaround is to set fixed SECRET_KEY as:

SECRET_KEY = 'randomchars'

or to define it in a different directory (for example, *unsecure* /tmp):

SECRET_KEY = secret_key.generate_or_read_from_file('/tmp/.secret_key_store')