Cloud Storage with Red Hat Ceph Storage

Procedure 1.2. Instructions

1. Use Firefox to navigate to the Dashboard web GUI URL at https://serverc.lab.example.com:8443. If prompted, accept the self-signed certificates that are used in this classroom.

   On the Dashboard login screen, enter your credentials.

   • User name: admin

   • Password: redhat

2. The Dashboard main screen appears, with three sections: Status, Capacity, and Performance.

   1. The Status section shows an overview of the whole cluster status. You can see the cluster health status, which can be HEALTH_OK, HEALTH_WARN, or HEALTH_ERR. Check that your cluster is in the HEALTH_OK state. This section displays the number of cluster hosts, the number of monitors and the cluster quorum that uses those monitors, the number and status of OSDs, and other options.

      Figure 1.7: Dashboard interface status screen

   2. The Dashboard Capacity section displays overall Ceph cluster capacity, the number of objects, the placement groups, and the pools. Check that the capacity of your cluster is approximately 90 GiB.

      Figure 1.8: Dashboard interface capacity screen

   3. The Performance section displays throughput information, and read and write disk speed. Because the cluster just started, the throughput and speed should be 0.

      Figure 1.9: Dashboard interface performance screen

3. Navigate to the Cluster menu.

   1. The Hosts section displays the host members of the Ceph cluster, the Ceph services that are running on each host, and the cephadm version that is running. In your cluster, check that the three hosts serverc, serverd, and servere are running the same cephadm version. In this menu, you can add hosts to the cluster, and edit or delete the existing hosts.

      Figure 1.10: Dashboard interface hosts screen

   2. The Inventory section displays the physical disks that the Ceph cluster detects. You can view physical disk attributes, such as their host, device path, and size. Verify that the total number of physical disks on your cluster is 20. In this menu, if you select one physical disk and press Identify, then that disk's LED starts flashing to make it easy to physically locate disks in your cluster.

      Figure 1.11: Dashboard interface inventory screen

   3. Navigate to the OSDs section to view information about the cluster OSDs. This section displays the number of OSDs, which host they reside on, the number and usage of placement groups, and the disk read and write speeds. Verify that serverc contains three OSDs. You can create, edit, and delete OSDs from this menu.

      Figure 1.12: Dashboard interface OSDs screen

   4. Navigate to the CRUSH Map section, which displays your cluster's CRUSH map. This map provides information about your cluster's physical hierarchy. Verify that the three host buckets serverc, serverd, and servere are defined within the default bucket of type root.

      Figure 1.13: Dashboard interface CRUSH screen

   5. The Logs section displays the Ceph logs. View the Cluster Logs and the Audit Logs. You can filter logging messages by priority, keyword, and date. View the Info log messages by filtering by Priority.

      Figure 1.14: Dashboard interface logs screen

4. Navigate to the Pools menu.

   Figure 1.15: Dashboard interface pools screen

   The Pools menu displays existing pool information, including the pool name and type of data protection, and the application. You can also create, edit, or delete the pools from this menu. Verify that your cluster contains a pool called default.rgw.log.