Stack overcloud upgrade prepare fails during FFU from 13 to 16

Solution Verified - Updated -


  • During the following step [1] of the fast-forward upgrade process, the stack update fails with status UPDATE_FAILED.
  • You use a custom template directory instead of /usr/share/openstack-tripleo-heat-templates in your stack for the --templates variable.
  • You may get an error that looks like the following:

    (resources[1]: '<' not supported between instances of 'datetime.datetime' and 'NoneType')



  • Red Hat OpenStack 13.0 (RHOSP 13)
  • Red Hat OpenStack 16.1 (RHOSP 16.1)
  • Red Hat OpenStack 16.2 (RHOSP 16.2)

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