Comment 3 for bug 1780385

The public endpoint DNS entry can be resolved inside the VM.
The internal endpoint DNS entry cannot be resolved inside the VM. A connect to the IP and keystone port is also not possible.

The error message in journalctl -u heat-container-agent is:
Jul 11 05:22:58 cz-test-k8s-atomic-26-xxq727c5v2ne-master-0.novalocal runc[3409]: Authorization failed: Unable to establish connection to https://internal.<api server>:5000/v3/auth/tokens
Jul 11 05:22:58 cz-test-k8s-atomic-26-xxq727c5v2ne-master-0.novalocal runc[3409]: Source [heat] Unavailable.

Prior to my changes, the heat config showed the internal endpoint and the endpoint type was also internal.