avmlp-osgw-001 /home/bofher :( # radosgw-admin zone get                                                                                                                                                                                                                                
2019-06-12 10:52:41.603 7f11d9c17580 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,: (2) No such file or directory
2019-06-12 10:52:41.603 7f11d9c17580 -1 AuthRegistry(0x55713ae351e8) no keyring found at /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,, disabling cephx
2019-06-12 10:52:41.604 7f11d9c17580 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,: (2) No such file or directory
2019-06-12 10:52:41.604 7f11d9c17580 -1 AuthRegistry(0x7fff3f12d918) no keyring found at /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin,, disabling cephx
failed to fetch mon config (--no-mon-config to skip)

radosgw is not locating the keyring.

Push the keyring to the gateways:

scp /etc/ceph/ceph.client.admin.keyring ${THESERVER}:/etc/ceph/ceph.client.admin.keyring

The keyring has root permissions:

ceph@avmlp-osm-001 ~/ceph-deploy $ ll /etc/ceph/ceph.client.admin.keyring 
-rw------- 1 root root 151 Jun 11 12:10 /etc/ceph/ceph.client.admin.keyring

So you must change permissions temporary so ceph user can transfer it.