Ceph was deployed using the yaml file using juju. Below is the content related to Ceph on the yaml file. 

  # CEPH configuration

  osd-devices: &osd-devices >-
    /dev/disk/by-dname/bcache0
    /dev/disk/by-dname/bcache1
    /dev/disk/by-dname/bcache2
    /dev/disk/by-dname/bcache3
    /dev/disk/by-dname/bcache4
    /dev/disk/by-dname/bcache5
    /dev/disk/by-dname/bcache6
    /dev/disk/by-dname/bcache7
    /dev/disk/by-dname/bcache8
    /dev/disk/by-dname/bcache9
    /dev/disk/by-dname/bcache10
    /dev/disk/by-dname/bcache11

  osd-config-flags:    &osd-config-flags        >
                                                {
                                                    osd: {
                                                        # enable discard as bluestore has to manage it
                                                        # instead of os doing it on a file system
                                                        # see https://github.com/ceph/ceph/pull/14727
                                                        bdev_enable_discard: true,
                                                        bdev_async_discard: true
                                                    }
                                                }
  customize-failure-domain:    &customize-failure-domain    False

  # Expected OSD count is total number of OSD disks that will be part of Ceph cluster.
  # Never set this number higher or much lower than the real number. 10-20% less than
  # actual number is acceptable
  #expected-osd-count:  &expected-osd-count  450
  expected-osd-count:  &expected-osd-count  192
  expected-mon-count:  &expected-mon-count  3

  # CEPH access network
  ceph-public-space:   &ceph-public-space   ceph-access-space

  # CEPH replication network
  ceph-cluster-space:  &ceph-cluster-space  ceph-cluster-space
  overlay-space: &overlay-space overlay-space

  # Workaround for 'only one default binding supported'
  oam-space-constr:    &oam-space-constr    spaces=oam-space
  ceph-access-constr:  &ceph-access-constr  spaces=ceph-access-space
  combi-access-constr:  &combi-access-constr  spaces=ceph-access-space,oam-space
  cinder:
    charm: cs:cinder-300
    num_units: 3
    constraints: *combi-access-constr
    bindings:
      "": *oam-space
      public: *public-space
      admin: *admin-space
      internal: *internal-space
      shared-db: *internal-space
      ceph: *ceph-public-space
    options:
      worker-multiplier: *worker-multiplier
      openstack-origin: *openstack-origin
      block-device: None
      glance-api-version: 2
      vip: *cinder-vip
      use-internal-endpoints: True
      region: *openstack-region
      config-flags: 'default_volume_type=cinder-ceph-ssd'
    to:
    - lxd:101
    - lxd:102
    - lxd:103
  cinder-ceph:
    charm: cs:cinder-ceph-253
    options:
      restrict-ceph-pools: False
  cinder-ceph-ssd:
    charm: cs:cinder-ceph-253
    options:
      restrict-ceph-pools: False
  cinder-ceph-nvme:
    charm: cs:cinder-ceph-253
    options:
      restrict-ceph-pools: False
  ceph-mon:
    charm: cs:ceph-mon-45
    num_units: 3
    bindings:
      "": *oam-space
      public: *ceph-public-space
      osd: *ceph-public-space
      client: *ceph-public-space
      admin: *ceph-public-space
      #cluster: *ceph-cluster-space
    options:
      expected-osd-count: *expected-osd-count
      source: *openstack-origin
      monitor-count: *expected-mon-count
      customize-failure-domain: *customize-failure-domain
    to:
    - 201
    - 202
    - 203
  ceph-radosgw:
    charm: cs:ceph-radosgw-285
    num_units: 4
    constraints: *combi-access-constr
    bindings:
      "": *oam-space
      public: *public-space
      admin: *admin-space
      internal: *internal-space
      mon: *ceph-public-space
    options:
      source: *openstack-origin
  vip: *rados-gateway-vip
      region: *openstack-region
      operator-roles: "Member,admin" # Contrail requires admin and not Admin
    to:
    - 211
    - 212
    - 213
    - 214
  ceph-osd:
    charm: cs:ceph-osd-298
    num_units: 16
    bindings:
      "": *oam-space
      public: *ceph-public-space
      cluster: *ceph-cluster-space
      secrets-storage: *internal-space
      mon: *ceph-public-space
    options:
      osd-devices: *osd-devices
      source: *openstack-origin
      customize-failure-domain: *customize-failure-domain
      autotune: true
   aa-profile-mode: complain
      bluestore: true
      config-flags: *osd-config-flags
      sysctl: '{ kernel.pid_max : 2097152, vm.max_map_count : 524288, kernel.threads-max: 2097152, fs.aio-max-nr: 1048576 }'
      #osd-encrypt: True
      #osd-encrypt-keymanager: vault
    to:
    - 2001
    - 2002
    - 2003
    - 2004
    - 2005
    - 2006
    - 2007
    - 2008
    - 2009
    - 2010
    - 2011
    - 2012
    - 2013
    - 2014
    - 2015
    - 2016
Hope this helps.