Public bug reported:
https://help.ubuntu.com/community/Kerberos
Principals
Principals are entries in the Kerberos database that represent users or
services on the network. Each user or service that is participates in a
Kerberos authentication realm must have a principal defined in the Kerberos
I have the same.
[2012-10-22 22:23:47,911: INFO/Beat] child process calling self.run()
[2012-10-22 22:23:47,911: INFO/Beat] Celerybeat: Starting...
[2012-10-22 22:23:47,959: INFO/Beat] Scheduler: Sending due task
provisioningserver.tasks.report_boot_images
[2012-10-22 22:28:48,067: INFO/Beat]
