Comment 10 for bug 1880579

The following is a tripleo validation failing to connect to the ceph cluster. To workaround try running config-download with a tag to skip validations

TASK [ceph : Check if ceph_mon is deployed] *******************************************************************************************************************************************************************
Friday 29 May 2020 12:21:36 +0000 (0:00:00.200) 0:19:25.096 ************
fatal: [undercloud]: UNREACHABLE! => {"changed": false, "msg": "Data could not be sent to remote host \"undercloud\". Make sure this host can be reached over ssh: ssh: Could not resolve hostname undercloud: Name or service not known\r\n", "unreachable": true}