I think I'm hitting this bug. I tried with cs:ceph-radosgw-286 and cs:~openstack-charmers-next/ceph-radosgw-363 but I end up with the same situation.

Unit             Workload  Agent  Machine  Public address  Ports   Message
ceph-radosgw/5*  blocked   idle   3/lxd/5  10.0.1.28       80/tcp  Services not running that should be: <email address hidden>

root@juju-10aa60-3-lxd-5:/var/log# grep ERROR juju/unit-ceph-radosgw-5.log
2020-06-01 17:23:52 DEBUG config-changed ERROR: Site openstack_https_frontend does not exist!

root@juju-10aa60-3-lxd-5:/var/log# systemctl list-units | grep failed
● sys-kernel-config.mount                      loaded failed     failed    Kernel Configuration File System                                              
● apache2.service                              loaded failed     failed    The Apache HTTP Server                                                        
● <email address hidden> loaded failed     failed    Ceph rados gateway                                                            
● systemd-modules-load.service                 loaded failed     failed    Load Kernel Modules                                                           

root@juju-10aa60-3-lxd-5:/var/log# journalctl -b |grep radosgw
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: <email address hidden>: Failed to reset devices.list: Operation not permitted
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: Failed to set devices.allow on /system.slice/system-ceph\<email address hidden>: Operation not permitted
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: Failed to set devices.allow on /system.slice/system-ceph\<email address hidden>: Operation not permitted
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: Failed to set devices.allow on /system.slice/system-ceph\<email address hidden>: Operation not permitted
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: Failed to set devices.allow on /system.slice/system-ceph\<email address hidden>: Operation not permitted
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: Failed to set devices.allow on /system.slice/system-ceph\<email address hidden>: Operation not permitted
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: Failed to set devices.allow on /system.slice/system-ceph\<email address hidden>: Operation not permitted
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: Failed to set devices.allow on /system.slice/system-ceph\<email address hidden>: Operation not permitted
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: Failed to set devices.allow on /system.slice/system-ceph\<email address hidden>: Operation not permitted
Jun 01 17:27:59 juju-10aa60-3-lxd-5 radosgw[20840]: 2020-06-01 17:27:59.315 7f50c23054c0 -1 auth: unable to find a keyring on /var/lib/ceph/radosgw/ceph-rgw.juju-10aa60-3-lxd-5/keyring: (2) No such file or directory
Jun 01 17:27:59 juju-10aa60-3-lxd-5 radosgw[20840]: 2020-06-01 17:27:59.315 7f50c23054c0 -1 monclient: ERROR: missing keyring, cannot use cephx for authentication
Jun 01 17:27:59 juju-10aa60-3-lxd-5 radosgw[20840]: failed to fetch mon config (--no-mon-config to skip)
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: <email address hidden>: Main process exited, code=exited, status=1/FAILURE
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: <email address hidden>: Failed with result 'exit-code'.
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: <email address hidden>: Service hold-off time over, scheduling restart.
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: <email address hidden>: Scheduled restart job, restart counter is at 5.
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: <email address hidden>: Start request repeated too quickly.
Jun 01 17:27:59 juju-10aa60-3-lxd-5 systemd[1]: <email address hidden>: Failed with result 'exit-code'.



ubuntu@hevelius:~$ juju status ceph-radosgw --relations
Model      Controller          Cloud/Region        Version  SLA          Timestamp
openstack  maas_cloud-default  maas_cloud/default  2.7.6    unsupported  17:42:56Z

App           Version  Status   Scale  Charm         Store       Rev  OS      Notes
ceph-radosgw  13.2.8   blocked      1  ceph-radosgw  jujucharms  363  ubuntu  

Unit             Workload  Agent  Machine  Public address  Ports   Message
ceph-radosgw/5*  blocked   idle   3/lxd/5  10.0.1.28       80/tcp  Services not running that should be: <email address hidden>

Machine  State    DNS        Inst id              Series  AZ       Message
3        started  10.0.1.17  node7                bionic  default  Deployed
3/lxd/5  started  10.0.1.28  juju-10aa60-3-lxd-5  bionic  default  Container started

Relation provider          Requirer                       Interface     Type     Message
ceph-mon:radosgw           ceph-radosgw:mon               ceph-radosgw  regular  
ceph-radosgw:cluster       ceph-radosgw:cluster           swift-ha      peer     
keystone:identity-service  ceph-radosgw:identity-service  keystone      regular