ceph-ansible/tests/functional/cephadm/hosts

[mons]
mon0
mon1
mon2

[mgrs]
mon0
mon1
mon2

[osds]
osd0
osd1

[mdss]
mds0

[rgws]
rgw0

[nfss]
nfs0

[rbdmirrors]
rbd-mirror0

[iscsigws]
iscsi-gw0

[grafana-server]
mon0