ceph-deploy fails amidst installation, logging the error "KeyNotFoundError: Could not find keyring file: /etc/ceph/ceph.client.admin.keyring on host {hostname}'.

Issue

• ceph-deploy fails on setting up an initial monitor with the following error:

[ceph_deploy][ERROR ] KeyNotFoundError: Could not find keyring file: /etc/ceph/ceph.client.admin.keyring on host {hostname}

• The installation was done following the Red Hat ceph Storage installation document available at https://access.redhat.com/beta/documentation/en/red-hat-ceph-storage-123-installation-guide-for-rhel-x86-64