On current stable/train when trying to install an undercloud you get an error around validations:
[centos@undercloud ~]$ openstack undercloud install
[WARNING]: log file at /usr/share/openstack-tripleo-validations/playbooks/ansible.log is not writeable and we cannot create it, aborting
Using /tmp/undercloud-disk-space.yamly3979oansible.cfg as config file
Success! The validation passed for all hosts:
* undercloud
[WARNING]: Failure using method (v2_playbook_on_stats) in callback plugin (<ansible.plugins.callback.validation_json.CallbackModule object at 0x7f1b37903a10>): [Errno 2] No such file or directory:
'/var/log/validations/fa163ebf-0175-b7c1-09fb-000000000006_undercloud-disk-space_2020-11-18T19:50:23.874129Z.json'
https:/ /review. rdoproject. org/r/# /c/31138/ should help.