The validation doesn't use the actual vhost configuration, and uses an IP, usually wrong. It should parse in some way the /etc/httpd/conf.d/image-serve.conf file in order to extract the VirtualHostname and use it in order to check if we get a working registry. This correction is now on review on upstream Master, and is a good candidate for a backport down to train/osp-16.1: https://review.opendev.org/#/c/743956/
openstack tripleo validator run --validation image-serve Passed
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Red Hat OpenStack Platform 16.1.3 bug fix and enhancement advisory), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2020:5413