https://docs.ceph.com/en/latest/releases/octopus/

Octopusではpython3モジュールの依存関係でCentos7がサポートされてない。

• dashboard
• prometheus
• restful manager modules

# yum update ceph
Error: Package: 2:ceph-mgr-dashboard-15.2.5-0.el7.noarch (Ceph-noarch)
           Requires: python3-cherrypy
Error: Package: 2:ceph-mgr-dashboard-15.2.5-0.el7.noarch (Ceph-noarch)
           Requires: python3-routes
Error: Package: 2:ceph-mgr-dashboard-15.2.5-0.el7.noarch (Ceph-noarch)
           Requires: python3-jwt