Explanation: Integration with Prometheus allows advanced metrics collection and visualization for Ceph clusters, aiding in monitoring and troubleshooting. Modify the pool replication size in an existing Red Hat Ceph Storage cluster from 3 to 2. ee the solution below. Solution: 1. Verify the current replication size: ceph osd pool get <pool_name> size 2. Change the replication size: ceph osd pool set <pool_name> size 2 3. Verify the updated replication size: ceph osd pool get <pool_name> size Explanation: Replication size determines the number of data copies. Reducing it lowers redundancy but saves storage space. Add a new monitor (MON) node to an existing Red Hat Ceph Storage cluster. ee the solution below. Solution: 1. Prepare the node for Ceph: yum install ceph -y 2. Add the MON node to the cluster: ceph mon add &t;new_mon_hostname> <ip_address> 3. Verify the MON node addition:
rbd mirror pool status my -pool Explanation: Snapshot mirroring within the same cluster ensures redundancy and data recovery options for critical snapshots. Migrate an RBD image using a full export and an incremental export while ensuring minimal downtime. ee the solution below. Solution: 1. Export the full image: rbd export my -pool/my -image /backup/full.img 2. Create a snapshot for incremental export: rbd snap create my -pool/my -image@incremental 3. Export the incremental changes: rbd export -diff my -pool/my -image@incremental /backup/incremental.diff 4. Import the full and incremental exports: rbd import /backup/full.img new -pool/my -image rbd import -diff /backup/incremental.diff new -pool/my -image Explanation: Combining full and incremental exports reduces downtime and ensures data consistency during migration. Create an RBD image for high-performance applications by specifying a small object size of 2MB and enabling the exclusive -lock feature. ee the solution below. Solution: 1. Create the RBD image:
rbd create high-performance -rbd --size 10240 --pool my-pool --object -size 2M --image -feature exclusive - lock 2. Verify the image properties: rbd info my -pool/high -performance -rbd Explanation: Smaller object sizes improve performance for applications with small, frequent writes, while exclusive - lock prevents access conflicts. Configure and test bidirectional RBD mirroring for selected images to synchronize data between two clusters. ee the solution below. Solution: 1. Enable mirroring for the image: rbd mirror image enable my -pool/my -image 2. Add peers to enable bidirectional synchronization: rbd mirror image peer add my -pool/my -image client.admin@remote -cluster rbd mirror image peer add remote -pool/remote -image client.admin@local -cluster 3. Verify synchronization status: rbd mirror image status my -pool/my -image Explanation: Bidirectional mirroring ensures data consistency in both clusters, supporting high availability and disaster recovery. Schedule automatic deletion of snapshots older than 7 days for an RBD pool. ee the solution below. Solution:
1. Enable snapshot scheduling: ceph mgr module enable rbd_support 2. Set up the snapshot schedule with retention: rbd snap -schedule add my -pool/my -image --interval 24h --retention 7 3. Verify the schedule and retention policy: rbd snap -schedule status my -pool/my -image Explanation: Automated snapshot retention policies ensure backups are managed efficiently by removing outdated snapshots. Resize an RBD image, expand the filesystem, and remount it with persistent changes in /etc/fstab. ee the solution below. Solution: 1. Resize the RBD image: rbd resize --size 20480 my -pool/my -image 2. Expand the filesystem: resize2fs /dev/rbd/my -pool/my -image 3. Update /etc/fstab for persistence: echo "/dev/rbd/my -pool/my -image /mnt/rbd ext4 defaults 0 0" >> /etc/fstab Explanation: Resizing and making changes persistent ensures applications can use additional storage seamlessly after reboots. Create and clone an RBD image snapshot for testing, enabling fast -diff for efficient backups. ee the solution below.
Solution: 1. Create a snapshot: rbd snap create my -pool/my -image@testing -snapshot 2. Enable fast -diff for the image: rbd feature enable my -pool/my -image fast -diff 3. Clone the snapshot for testing: rbd clone my -pool/my -image@testing -snapshot my -pool/my -clone Explanation: Cloning snapshots for testing isolates workloads while the fast-diff feature optimizes differential backup performance. Export and compress an RBD image with gzip, then verify its integrity after decompression. ee the solution below. Solution: 1. Export the RBD image: rbd export my -pool/my -image /backup/my -image.raw 2. Compress the image: gzip /backup/my -image.raw 3. Decompress and verify integrity: gunzip /backup/my -image.raw.gz rbd import /backup/my -image.raw my -pool/restored -image Explanation: Compressing RBD exports saves space, and verifying integrity ensures that the image is usable after decompression.
3. Apply the new CRUSH map: crushtool -c crush.txt -o crush.map ceph osd setcrushmap -i crush.map Explanation: CRUSH maps define how data is distributed across OSDs. Customizing these maps allows fine-grained control over data placement. Set up Ceph storage with authentication enabled and verify that clients require keys to access the cluster. ee the solution below. Solution: 1. Enable authentication in the Ceph configuration file: ceph config set mon auth_allow_insecure_global_id_reclaim false 2. Generate a client key: ceph auth get -or-create client.admin 3. Verify client access using the key: ceph -s --keyring /etc/ceph/ceph.client.admin.keyring Explanation: Enabling authentication adds a layer of security, ensuring only authorized clients can interact with the cluster. Deploy Ceph storage and configure BlueStore as the OSD backend for optimal performance. ee the solution below. Solution: 1. Update the playbook with BlueStore settings: osd_objectstore: bluestore
