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+======================
+Ceph cluster migration
+======================
+
+This guide contains step by step instructions for migrating StarlingX R3.0
+with standard controller storage Ceph cluster to the containerized Ceph
+cluster deployed by Rook.
+
+.. contents::
+   :local:
+   :depth: 1
+
+------------
+Introduction
+------------
+
+In StarlingX 3.0 or lower versions, Ceph as the backend storage cluster
+solution was deployed directly on the host platform. The intent is that
+starting from 4.0 Ceph cluster will be containerized and managed by Rook,
+for the sake of operation and maintenance efficiency. Therefore, in the
+context of StarlingX upgrade from 3.0 to 4.0, we are here introducing a
+method to migrate the original Ceph cluster deployed by users at 3.0
+provisioning stage to the newly containerized Ceph cluster at 4.0, while
+keeping user data (in OSDs) uncorrupted.
+
+---------------------
+Prepare for migration
+---------------------
+
+StarlingX has some HA mechanisms for critical service monitoring and
+recovering. To migrate Ceph monitor(s) and Ceph OSD(s), the first step is to
+disable the monitoring and recovering for Ceph services, otherwise the migration
+procedure might be interfered due to the continuous service restarting.
+
+*************************************
+Disable StarlingX HA for ceph service
+*************************************
+
+Disable monitoring and recovering for Ceph service by pmon and service manager.
+
+#. Disable pmon's monitoring for Ceph mon and Ceph osd on every host.
+
+   ::
+
+    $ sudo rm -f /etc/pmon.d/ceph.conf
+    $ sudo /usr/local/sbin/pmon-restart pmon_cmd_port
+
+#. Disable service manager's monitoring for Ceph manager on controller host.
+
+   ::
+
+    $ sudo sm-unmanage service  mgr-restful-plugin
+    Service (mgr-restful-plugin) is no longer being managed.
+    $ sudo sm-unmanage service  ceph-manager
+    Service (ceph-manager) is no longer being managed.
+
+**********************************
+Enable ceph service authentication
+**********************************
+
+StarlingX disables Ceph authentication, but authentication is must for rook.
+Before migration, enable authentication for each of daemons.
+
+#. Enabled authentication for Ceph mon and osd service.
+
+   ::
+
+    $ ceph config set mon.storage-0 auth_cluster_required cephx
+    $ ceph config set mon.storage-0 auth_supported cephx
+    $ ceph config set mon.storage-0 auth_service_required cephx
+    $ ceph config set mon.storage-0 auth_client_required cephx
+    $ ceph config set mon.controller-0 auth_cluster_required cephx
+    $ ceph config set mon.controller-0 auth_supported cephx
+    $ ceph config set mon.controller-0 auth_service_required cephx
+    $ ceph config set mon.controller-0 auth_client_required cephx
+    $ ceph config set mon.controller-1 auth_cluster_required cephx
+    $ ceph config set mon.controller-1 auth_supported cephx
+    $ ceph config set mon.controller-1 auth_service_required cephx
+    $ ceph config set mon.controller-1 auth_client_required cephx
+    $ ceph config set mgr.controller-0 auth_supported cephx
+    $ ceph config set mgr.controller-0 auth_cluster_required cephx
+    $ ceph config set mgr.controller-0 auth_client_required cephx
+    $ ceph config set mgr.controller-0 auth_service_required cephx
+    $ ceph config set mgr.controller-1 auth_supported cephx
+    $ ceph config set mgr.controller-1 auth_cluster_required cephx
+    $ ceph config set mgr.controller-1 auth_client_required cephx
+    $ ceph config set mgr.controller-1 auth_service_required cephx
+    $ ceph config set osd.0 auth_supported cephx
+    $ ceph config set osd.0 auth_cluster_required cephx
+    $ ceph config set osd.0 auth_service_required cephx
+    $ ceph config set osd.0 auth_client_required cephx
+    $ ceph config set osd.1 auth_supported cephx
+    $ ceph config set osd.1 auth_cluster_required cephx
+    $ ceph config set osd.1 auth_service_required cephx
+    $ ceph config set osd.1 auth_client_required cephx
+
+#. Generate client.admin key.
+
+   ::
+
+    $ ADMIN_KEY=$(ceph auth get-or-create-key client.admin mon 'allow *' osd 'allow *' mgr 'allow *' mds 'allow *')
+    $ echo $ADMIN_KEY
+    AQDRGqFea0cYERAAwYdhhle5zEbLLkYHWF+sDw==
+    $ MON_KEY=$(ceph auth get-or-create-key mon. mon 'allow *')
+    $ echo $MON_KEY
+    AQBbs79eM4/FMRAAbu4jwdBFVS1hOmlCdoCacQ==
+
+***********************************************
+Create configmap and secret for rook deployment
+***********************************************
+
+Rook will read secret rook-ceph-mon and configmap rook-ceph-mon-endpoint
+to get cluster info in deployment.
+
+#. Create configmap and secret for rook deployment.
+
+   ::
+
+    $ export NAMESPACE=kube-system
+    $ export ROOK_EXTERNAL_CEPH_MON_DATA=a=192.188.204.3:6789
+    $ export ROOK_EXTERNAL_FSID=$(ceph fsid)
+    $ export ROOK_EXTERNAL_CLUSTER_NAME=$NAMESPACE
+    $ export ROOK_EXTERNAL_MAX_MON_ID=0
+
+    $ kubectl -n "$NAMESPACE"  create secret generic rook-ceph-mon \
+    > --from-literal=cluster-name="$ROOK_EXTERNAL_CLUSTER_NAME" \
+    > --from-literal=fsid="$ROOK_EXTERNAL_FSID" \
+    > --from-literal=admin-secret="$ADMIN_KEY" \
+    > --from-literal=mon-secret="$MON_KEY"
+    secret/rook-ceph-mon created
+
+    $ kubectl -n "$NAMESPACE" create configmap rook-ceph-mon-endpoints \
+    > --from-literal=data="$ROOK_EXTERNAL_CEPH_MON_DATA" \
+    > --from-literal=mapping="$ROOK_EXTERNAL_MAPPING" \
+    > --from-literal=maxMonId="$ROOK_EXTERNAL_MAX_MON_ID"
+    configmap/rook-ceph-mon-endpoint created
+
+**********************
+Remove rbd-provisioner
+**********************
+
+Application platform-integ-apps deploys the helm chart rbd-provisioner. This
+chart will be unncesssary after rook deployed, remove before rook deployment.
+
+#. remove rbd-provisioner.
+
+   ::
+
+    $ sudo rm -rf /opt/platform/sysinv/20.01/.crushmap_applied
+    $ source /etc/platform/openrc
+    $ system application-remove platform-integ-apps
+    +---------------+----------------------------------+
+    | Property      | Value                            |
+    +---------------+----------------------------------+
+    | active        | True                             |
+    | app_version   | 1.0-8                            |
+    | created_at    | 2020-04-22T14:56:19.148562+00:00 |
+    | manifest_file | manifest.yaml                    |
+    | manifest_name | platform-integration-manifest    |
+    | name          | platform-integ-apps              |
+    | progress      | None                             |
+    | status        | removing                         |
+    | updated_at    | 2020-04-22T15:46:24.018090+00:00 |
+    +---------------+----------------------------------+
+
+************************************************************************
+Disable ceph osd on all storage hosts and create configmap for migration
+************************************************************************
+
+Login to storage host with osd provisioned, disable Ceph osd service and create
+journal file
+
+#. Disable Ceph osd service.
+
+   ::
+
+    $ sudo service ceph -a stop osd.1
+    === osd.1 ===
+    Stopping Ceph osd.1 on storage-0...kill  213077...
+    done
+    2020-04-26 23:36:56.988 7f1d647bb1c0 -1 journal do_read_entry(585007104): bad header magic
+    2020-04-26 23:36:56.988 7f1d647bb1c0 -1 journal do_read_entry(585007104): bad header magic
+    2020-04-26 23:36:56.994 7f1d647bb1c0 -1 flushed journal /var/lib/ceph/osd/ceph-1/journal for object store /var/lib/ceph/osd/ceph-1
+
+#. Remove journal link and create a blank journal file
+
+   ::
+
+    $ sudo rm -f /var/lib/ceph/osd/ceph-1/journal
+    $ sudo touch /var/lib/ceph/osd/ceph-1/journal
+    $ sudo dd if=/dev/zero of=/var/lib/ceph/osd/ceph-1/journal bs=1M count=1024
+    $ sudo ceph-osd --id 1  --mkjournal --no-mon-config
+    $ sudo umount /dev/sdc1
+
+#. Mount to host patch /var/lib/ceph/osd<n>, which could be access by rook's osd pod
+
+   ::
+
+    $ sudo mkdir -p /var/lib/ceph/ceph-1/osd1
+    $ sudo mount /dev/sdc1 /var/lib/ceph/ceph-1/osd1
+    $ sudo ls /var/lib/ceph/ceph-1/osd1 -l
+    total 1048640
+    -rw-r--r--   1 root root          3 Apr 26 12:57 active
+    -rw-r--r--   1 root root         37 Apr 26 12:57 ceph_fsid
+    drwxr-xr-x 388 root root      12288 Apr 27 00:01 current
+    -rw-r--r--   1 root root         37 Apr 26 12:57 fsid
+    -rw-r--r--   1 root root 1073741824 Apr 27 00:49 journal
+    -rw-r--r--   1 root root         37 Apr 26 12:57 journal_uuid
+    -rw-------   1 root root         56 Apr 26 12:57 keyring
+    -rw-r--r--   1 root root         21 Apr 26 12:57 magic
+    -rw-r--r--   1 root root          6 Apr 26 12:57 ready
+    -rw-r--r--   1 root root          4 Apr 26 12:57 store_version
+    -rw-r--r--   1 root root         53 Apr 26 12:57 superblock
+    -rw-r--r--   1 root root          0 Apr 26 12:57 sysvinit
+    -rw-r--r--   1 root root         10 Apr 26 12:57 type
+    -rw-r--r--   1 root root          2 Apr 26 12:57 wanttobe
+    -rw-r--r--   1 root root          2 Apr 26 12:57 whoami
+
+For every host with osd device, create a configmap. Configmap name is
+rook-ceph-osd-<hostname>-config. In configmap, it specified osd data folder.
+For example, this data will info rook osd0 data path is /var/lib/ceph/osd0
+
+   ::
+
+    osd-dirs: '{"/var/lib/ceph/ceph-0/":0}'
+
+    $ system host-stor-list storage-0
+    +--------------------------------------+----------+-------+------------+--------------------------------------+-----------------------------+------------+--------------+-----------+
+    | uuid                                 | function | osdid | state      | idisk_uuid                           | journal_path                | journal_no | journal_size | tier_name |
+    |                                      |          |       |            |                                      |                             | de         | _gib         |           |
+    +--------------------------------------+----------+-------+------------+--------------------------------------+-----------------------------+------------+--------------+-----------+
+    | 21a90d60-2f1e-4f46-badc-afa7d9117622 | osd      | 1     | configured | a13c6ac9-9d59-4063-88dc-2847e8aded85 | /dev/disk/by-path/pci-0000: | /dev/sdc2  | 1            | storage   |
+    |                                      |          |       |            |                                      | 00:03.0-ata-3.0-part2       |            |              |           |
+    |                                      |          |       |            |                                      |                             |            |              |           |
+    | d259a366-3633-4c03-9268-0cd35b2b274d | osd      | 0     | configured | 54b3cb9d-4527-448a-9051-62b250c2a03f | /dev/disk/by-path/pci-0000: | /dev/sdb2  | 1            | storage   |
+    |                                      |          |       |            |                                      | 00:03.0-ata-2.0-part2       |            |              |           |
+    |                                      |          |       |            |                                      |                             |            |              |           |
+    +--------------------------------------+----------+-------+------------+--------------------------------------+-----------------------------+------------+--------------+-----------+
+
+    $ system host-stor-list storage-1
+    +--------------------------------------+----------+-------+------------+--------------------------------------+-----------------------------+------------+--------------+-----------+
+    | uuid                                 | function | osdid | state      | idisk_uuid                           | journal_path                | journal_no | journal_size | tier_name |
+    |                                      |          |       |            |                                      |                             | de         | _gib         |           |
+    +--------------------------------------+----------+-------+------------+--------------------------------------+-----------------------------+------------+--------------+-----------+
+    | 17f2db8e-c80e-4df7-9525-1f0cb5b54cd3 | osd      | 3     | configured | 89637c7d-f959-4c54-bfe1-626b5c630d96 | /dev/disk/by-path/pci-0000: | /dev/sdc2  | 1            | storage   |
+    |                                      |          |       |            |                                      | 00:03.0-ata-3.0-part2       |            |              |           |
+    |                                      |          |       |            |                                      |                             |            |              |           |
+    | 64b9d56c-c384-4bd6-a437-89d6bfda4ec5 | osd      | 2     | configured | ad52345c-254c-48c1-9034-778738c7e23b | /dev/disk/by-path/pci-0000: | /dev/sdb2  | 1            | storage   |
+    |                                      |          |       |            |                                      | 00:03.0-ata-2.0-part2       |            |              |           |
+    |                                      |          |       |            |                                      |                             |            |              |           |
+    +--------------------------------------+----------+-------+------------+--------------------------------------+-----------------------------+------------+--------------+-----------+
+
+
+#. Sample osd-configmap.yaml
+   ::
+
+    apiVersion: v1
+    kind: ConfigMap
+    metadata:
+      name: rook-ceph-osd-storage-0-config
+      namespace: kube-system
+    data:
+      osd-dirs: '{"/var/lib/ceph/ceph-0":0,"/var/lib/ceph/ceph-1":1}'
+    ---
+    apiVersion: v1
+    kind: ConfigMap
+    metadata:
+      name: rook-ceph-osd-storage-1-config
+      namespace: kube-system
+    data:
+      osd-dirs: '{"/var/lib/ceph/ceph-2":2,"/var/lib/ceph/ceph-3":3}'
+
+#. Apply yaml file for configmap
+
+   ::
+
+    $ kubectl apply -f osd-configmap.yaml
+    configmap/rook-ceph-osd-storage-0-config created
+    configmap/rook-ceph-osd-storage-1-config created
+
+**************************
+Ceph monitor data movement
+**************************
+
+For Ceph monitor migration, Rook deployed monitor pod will read monitor data
+for host path /var/lib/ceph/mon-<id>/data. For example, if only deployed one
+monitor pod, a monitor process named "mon.a" in monitor pod will be created
+and monitor data in host path /var/lib/ceph/mon-a/data. So before migration,
+one monitor service should be disable and launch another monitor which will
+be specified with parameter "--mon-data /var/lib/ceph/mon-a/data" to make
+monitor data migrating to /var/lib/ceph/mon-a/data.
+
+#. Login host controller-0, disable service monitor.controller-0.
+
+   ::
+
+    $ sudo service ceph -a stop mon.controller-0
+    === mon.controller-0 ===
+    Stopping Ceph mon.controller-0 on controller-0...kill  291101...done
+
+#. Login host controller-1, disable service monitor.controller-1.
+
+   ::
+
+    $ sudo service ceph -a stop mon.controller-1
+    === mon.controller-1 ===
+    Stopping Ceph mon.controller-1 on controller-1...kill  385107...
+    done
+
+#. Login host storage-0, disable service monitor.storage-0.
+
+   ::
+
+    $ sudo service ceph -a stop mon.storage-0
+    === mon.storage-0 ===
+    Stopping Ceph mon.storage-0 on storage-0...kill  31394...
+    done
+
+#. Copy mon data to folder /var/lib/ceph/mon-a/data.
+
+   ::
+
+    $ sudo mkdir -p /var/lib/ceph/mon-a/data/
+    $ sudo ceph-monstore-tool /var/lib/ceph/mon/ceph-controller-0/ store-copy /var/lib/ceph/mon-a/data/
+
+#. Update monmap in this copy of monitor data, update monitor info.
+
+   ::
+
+    $ sudo ceph-mon --extract-monmap monmap --mon-data /var/lib/ceph/mon-a/data/
+    2020-05-21 06:01:39.477 7f69d63b2140 -1 wrote monmap to monmap
+
+    $ monmaptool --print monmap
+    monmaptool: monmap file monmap
+    epoch 2
+    fsid 6c9e9e4b-599e-4a4f-931e-2c09bec74a2a
+    last_changed 2020-05-21 04:29:59.164965
+    created 2020-05-21 03:50:51.893155
+    0: 192.188.204.3:6789/0 mon.controller-0
+    1: 192.188.204.4:6789/0 mon.controller-1
+    2: 192.188.204.41:6789/0 mon.storage-0
+
+    $ sudo monmaptool --rm controller-0 monmap
+    monmaptool: monmap file monmap
+    monmaptool: removing controller-0
+    monmaptool: writing epoch 2 to monmap (2 monitors)
+
+    $ sudo monmaptool --rm controller-1 monmap
+    monmaptool: monmap file monmap
+    monmaptool: removing controller-1
+    monmaptool: writing epoch 2 to monmap (1 monitors)
+
+    $ sudo monmaptool --rm storage-0 monmap
+    monmaptool: monmap file monmap
+    monmaptool: removing storage-0
+    monmaptool: writing epoch 2 to monmap (0 monitors)
+
+    $ sudo monmaptool --add a 192.188.204.3 monmap
+    monmaptool: monmap file monmap
+    monmaptool: writing epoch 2 to monmap (1 monitors)
+
+    $  monmaptool --print monmap
+    monmaptool: monmap file monmap
+    epoch 2
+    fsid 6c9e9e4b-599e-4a4f-931e-2c09bec74a2a
+    last_changed 2020-05-21 04:29:59.164965
+    created 2020-05-21 03:50:51.893155
+    0: 192.188.204.3:6789/0 mon.a
+
+    $ sudo ceph-mon --inject-monmap monmap  --mon-data /var/lib/ceph/mon-a/data/
+
+----------------------
+Deploy Rook helm chart
+----------------------
+
+StarlingX already creates a application for Rook deployment, after finish the
+above preparation, apply the application to deploy rook. To make live migration
+and keep Ceph service always readiness, Ceph service should migrate in turn.
+First Ceph monitor, which is mon.a, exits and launch rook cluster with one monitor
+pod. At this time, 2 monitor daemons and 1 monitor pod is running and then migrate
+osd one by one. At last, migrate 2 monitor daemon and migration is done.
+
+**************************************
+Disable Ceph monitors and Ceph manager
+**************************************
+
+Disable Ceph manager on host controller-0 and controller-1
+
+#. Disable Ceph manager
+
+   ::
+
+    $ ps -aux | grep mgr
+    root       97971  0.0  0.0 241336 18488 ?        S<   03:54   0:02 /usr/bin/python /etc/init.d/mgr-restful-plugin start
+    root       97990  0.5  0.0 241468 18916 ?        S<   03:54   0:38 /usr/bin/python /etc/init.d/mgr-restful-plugin start
+    root      186145  1.2  0.3 716488 111328 ?       S<l  04:11   1:16 /usr/bin/ceph-mgr --cluster ceph --conf /etc/ceph/ceph.conf --id controller-0 -f
+    sysadmin  643748  0.0  0.0 112712   976 pts/0    S+   05:51   0:00 grep --color=auto mgr
+    $ sudo kill -9 97971  97990  186145
+
+    $ ps -aux | grep ceph
+    root       98044  0.2  0.1 352052 53556 ?        S<   03:54   0:15 python /usr/bin/ceph-manager --log-file=/var/log/ceph-manager.log --config-file=/etc/sysinv/sysinv.conf
+    root      647566  0.0  0.0 112220   668 ?        S<   05:52   0:00 /usr/bin/timeout 30 /usr/bin/ceph fsid
+    root      647567  1.0  0.0 810452 22320 ?        S<l  05:52   0:00 /usr/bin/python2.7 /usr/bin/ceph fsid
+    sysadmin  648519  0.0  0.0 112712   976 pts/0    S+   05:52   0:00 grep --color=auto ceph
+    $ sudo kill -9 98044
+
+Also disable Ceph manager on host controller-1.
+
+***************************
+Apply rook-ceph application
+***************************
+
+Exit Ceph mon.a and Ceph manager, then deploy rook.
+
+#. Assign label for Ceph monitor and Ceph manager pod.
+
+   ::
+
+    $ source /etc/platform/openrc
+    $ system host-label-assign controller-0 ceph-mon-placement=enabled
+    +-------------+--------------------------------------+
+    | Property    | Value                                |
+    +-------------+--------------------------------------+
+    | uuid        | ee117051-5422-4776-adc5-6c1e0a21e975 |
+    | host_uuid   | 7271854b-551a-4bb3-a4d6-4351024dd649 |
+    | label_key   | ceph-mon-placement                   |
+    | label_value | enabled                              |
+    +-------------+--------------------------------------+
+    $ system host-label-assign controller-0 ceph-mgr-placement=enabled
+    +-------------+--------------------------------------+
+    | Property    | Value                                |
+    +-------------+--------------------------------------+
+    | uuid        | 948788ab-0d5a-43ff-ba35-1b767356dcfe |
+    | host_uuid   | 7271854b-551a-4bb3-a4d6-4351024dd649 |
+    | label_key   | ceph-mgr-placement                   |
+    | label_value | enabled                              |
+    +-------------+--------------------------------------+
+
+#. Update override value for application rook-ceph-apps with a created values.yaml.
+
+   ::
+
+    $ system  helm-override-update  rook-ceph-apps rook-ceph kube-system --set cluster.mon.count=1
+    +----------------+----------------+
+    | Property       | Value          |
+    +----------------+----------------+
+    | name           | rook-ceph      |
+    | namespace      | kube-system    |
+    | user_overrides | cluster:       |
+    |                |   mon:         |
+    |                |     count: "1" |
+    |                |                |
+    +----------------+----------------+
+
+#. The application "rook-ceph-apps" is a sysinv-managed applicaiton.
+   First upload it, then apply application.
+
+   ::
+
+    $ system application-apply rook-ceph-apps
+    +---------------+----------------------------------+
+    | Property      | Value                            |
+    +---------------+----------------------------------+
+    | active        | False                            |
+    | app_version   | 1.0-1                            |
+    | created_at    | 2020-04-22T14:56:20.893255+00:00 |
+    | manifest_file | manifest.yaml                    |
+    | manifest_name | rook-ceph-manifest               |
+    | name          | rook-ceph-apps                   |
+    | progress      | None                             |
+    | status        | applying                         |
+    | updated_at    | 2020-04-22T14:56:26.643693+00:00 |
+    +---------------+----------------------------------+
+
+#. Use command "kubectl get pods -n kube-system", wait for mon pod launch.
+   Then edit CephCluster add osd directories config and mon count to 3.
+
+   ::
+
+    rook-ceph-mgr-a-79cc758465-ltjwb               1/1     Running            4          3m11s
+    rook-ceph-mon-a-64ccf46969-5k8kp               1/1     Running            5          3m13s
+    rook-ceph-operator-6fc8cfb68b-dsqkt            1/1     Running            0          5m
+    rook-ceph-tools-84c7fff88c-9g598               1/1     Running            0          4m12s
+
+   ::
+
+    storage:
+      nodes:
+      - config:
+          storeType: filestore
+        directories:
+        - path: /var/lib/ceph/ceph-0
+        - path: /var/lib/ceph/ceph-1
+        name: storage-0
+        resources: {}
+      - config:
+          storeType: filestore
+        directories:
+        - path: /var/lib/ceph/ceph-2
+        - path: /var/lib/ceph/ceph-3
+        name: storage-1
+        resources: {}
+
+#. Wait for rook pods launch.
+
+   ::
+
+    rook-ceph-mgr-a-d98dd9559-ltlr7                1/1     Running     0          3m13s
+    rook-ceph-mon-a-659d8857cc-plbkt               1/1     Running     0          3m27s
+    rook-ceph-operator-6fc8cfb68b-km445            1/1     Running     0          6m22s
+    rook-ceph-osd-0-74f69cf96-h6qsj                1/1     Running     0          54s
+    rook-ceph-osd-1-6777967c99-g48vz               1/1     Running     0          55s
+    rook-ceph-osd-2-6b868774d6-vqf7f               1/1     Running     0          55s
+    rook-ceph-osd-3-d648b6745-c5cnz                1/1     Running     0          55s
+    rook-ceph-osd-prepare-storage-0-pgb6l          0/1     Completed   0          67s
+    rook-ceph-osd-prepare-storage-1-fms4c          0/1     Completed   0          67s
+    rook-ceph-tools-84c7fff88c-px74q               1/1     Running     0          5m34s
+    rook-discover-cmfw7                            1/1     Running     0          5m37s
+    rook-discover-hpz4q                            1/1     Running     0          5m37s
+    rook-discover-n8j72                            1/1     Running     0          5m37s
+    rook-discover-njxsd                            1/1     Running     0          5m37s
+    rook-discover-wkhgq                            1/1     Running     0          5m37s
+    rook-discover-xm54j                            1/1     Running     0          5m37s
+    storage-init-rbd-provisioner-c9j5w             0/1     Completed   0          10h
+    storage-init-rook-ceph-provisioner-zjzcq       1/1     Running     0          47s
+
+#. Assign label ceph-mon-placement and ceph-mgr-placement. And edit CephCluster,
+   change mon number to 3.
+
+   ::
+
+    $ system host-label-assign controller-1 ceph-mon-placement=enabled
+    +-------------+--------------------------------------+
+    | Property    | Value                                |
+    +-------------+--------------------------------------+
+    | uuid        | df9aff88-8863-49ca-aea8-85f8a0e1dc71 |
+    | host_uuid   | 8cdb45bc-1fd7-4811-9459-bfd9301e93cf |
+    | label_key   | ceph-mon-placement                   |
+    | label_value | enabled                              |
+    +-------------+--------------------------------------+
+    [sysadmin@controller-0 ~(keystone_admin)]$ system host-label-assign storage-0 ceph-mon-placement=enabled
+    +-------------+--------------------------------------+
+    | Property    | Value                                |
+    +-------------+--------------------------------------+
+    | uuid        | 44b47f2a-4a00-4800-ab60-9a14c4c2ba24 |
+    | host_uuid   | 0eeb4f94-1eec-4493-83ae-f08f069e06ce |
+    | label_key   | ceph-mon-placement                   |
+    | label_value | enabled                              |
+    +-------------+--------------------------------------+
+    [sysadmin@controller-0 ~(keystone_admin)]$ system host-label-assign controller-1 ceph-mgr-placement=enabled
+    +-------------+--------------------------------------+
+    | Property    | Value                                |
+    +-------------+--------------------------------------+
+    | uuid        | badde75f-4d4f-4c42-8cb8-7e9c69729935 |
+    | host_uuid   | 8cdb45bc-1fd7-4811-9459-bfd9301e93cf |
+    | label_key   | ceph-mgr-placement                   |
+    | label_value | enabled                              |
+    +-------------+--------------------------------------+
+
+   ::
+
+    mgr: {}
+    mon:
+      count: 3
+
+#. Wait for two other monitor pods launch and check cluster status in pod rook-tool
+
+   ::
+
+    rook-ceph-mgr-a-5b47f4f5cc-cskxc               1/1     Running     0          10m
+    rook-ceph-mon-a-7fc5cfc949-q4hrb               1/1     Running     0          10m
+    rook-ceph-mon-b-698bf594d7-82js8               1/1     Running     0          20s
+    rook-ceph-operator-6fc8cfb68b-kfpz4            1/1     Running     2          15m
+    rook-ceph-osd-0-796c4b8d86-6v9js               1/1     Running     0          2m33s
+    rook-ceph-osd-1-5d5c445c69-hsmfv               1/1     Running     0          2m33s
+    rook-ceph-osd-2-5595c46f48-txv9d               1/1     Running     0          2m20s
+    rook-ceph-osd-3-7569d8b6b7-7x7pp               1/1     Running     0          2m20s
+    rook-ceph-osd-prepare-storage-0-lb4rd          0/1     Completed   0          2m35s
+    rook-ceph-osd-prepare-storage-1-d6rht          0/1     Completed   0          2m35s
+    rook-ceph-tools-84c7fff88c-shf4m               1/1     Running     0          14m
+    rook-discover-7rqfs                            1/1     Running     0          14m
+    rook-discover-bp5rb                            1/1     Running     0          14m
+    rook-discover-bz4pj                            1/1     Running     0          14m
+    rook-discover-pd7tg                            1/1     Running     0          14m
+    rook-discover-ppw8q                            1/1     Running     0          14m
+    rook-discover-thpfh                            1/1     Running     0          14m
+    storage-init-rbd-provisioner-fbnnh             0/1     Completed   0          143m
+    storage-init-rook-ceph-provisioner-66jzn       0/1     Completed   0          2m24s
+
+   ::
+
+    $ kubectl exec -it rook-ceph-tools-84c7fff88c-shf4m bash  -n kube-system
+    kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.
+    bash: warning: setlocale: LC_CTYPE: cannot change locale (en_US.UTF-8): No such file or directory
+    bash: warning: setlocale: LC_COLLATE: cannot change locale (en_US.UTF-8): No such file or directory
+    bash: warning: setlocale: LC_MESSAGES: cannot change locale (en_US.UTF-8): No such file or directory
+    bash: warning: setlocale: LC_NUMERIC: cannot change locale (en_US.UTF-8): No such file or directory
+    bash: warning: setlocale: LC_TIME: cannot change locale (en_US.UTF-8): No such file or directory
+    [root@compute-1 /]# ceph -s
+      cluster:
+        id:     6c9e9e4b-599e-4a4f-931e-2c09bec74a2a
+        health: HEALTH_OK
+
+      services:
+        mon: 3 daemons, quorum a,b,c
+        mgr: a(active)
+        osd: 4 osds: 4 up, 4 in
+
+      data:
+        pools:   1 pools, 64 pgs
+        objects: 0  objects, 0 B
+        usage:   4.4 GiB used, 391 GiB / 396 GiB avail
+        pgs:     64 active+clean
+
+---------------------------------
+Remove storage backend ceph-store
+---------------------------------
+
+After migration, remove default storage backend ceph-store.
+
+#. Remove storage backend
+
+   ::
+
+    $ system storage-backend-list
+    +--------------------------------------+------------+---------+------------+------+----------+------------------------------------------------------------------------+
+    | uuid                                 | name       | backend | state      | task | services | capabilities                                                           |
+    +--------------------------------------+------------+---------+------------+------+----------+------------------------------------------------------------------------+
+    | 3fd0a407-dd8b-4a5c-9dec-8754d76956f4 | ceph-store | ceph    | configured | None | None     | min_replication: 1 replication: 2                                      |
+    |                                      |            |         |            |      |          |                                                                        |
+    +--------------------------------------+------------+---------+------------+------+----------+------------------------------------------------------------------------+
+    $ system storage-backend-delete 3fd0a407-dd8b-4a5c-9dec-8754d76956f4 --force
+
diff --git a/doc/source/operations/index.rst b/doc/source/operations/index.rst
index b8b2f85ed..f503d92b7 100644
--- a/doc/source/operations/index.rst
+++ b/doc/source/operations/index.rst
@@ -20,6 +20,7 @@ General Operation
    lldp_monitor
    storage_util_display
    tsn
+   ceph_cluster_migration
 
 --------------------
 Kubernetes Operation