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While there may be some cases where it is possible to upgrade by skipping this step (i.e. by upgrading only the openstack_release version) - generally when looking at a more comprehensive upgrade, the Kolla-ansible package itself should be upgraded first. This will include reviewing some of the configuration and inventory files. On the operator/master node, a backup of the /etc/kolla directory may be desirable.

If upgrading from 5.0.0 to 6.0.0, upgrade the kolla-ansible package:

pip install --upgrade kolla-ansible==6.0.0

Ref. link: https://docs.openstack.org/kolla-ansible/latest/user/operating-kolla.html