Ceph Dashboard

The dashboard is a very helpful tool to give you an overview of the status of your cluster, including overall health, status of the mon quorum, status of the mgr, osd, and other Ceph daemons, view pools and PG status, show logs for the daemons, and more. Rook makes it simple to enable the dashboard.

The Ceph dashboard

Enable the Dashboard

The dashboard can be enabled with settings in the cluster CRD. The cluster CRD must have the dashboard enabled setting set to true. This is the default setting in the example manifests.

  1.   spec:
  2.     dashboard:
  3.       enabled: true

The Rook operator will enable the ceph-mgr dashboard module to listen on the default port 7000. A K8s service will also be created to expose that port inside the cluster.

  1. kubectl -n rook-ceph get service
  2. NAME                               TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
  3. rook-ceph-mgr                      ClusterIP   10.108.111.192   <none>        9283/TCP         3h
  4. rook-ceph-mgr-dashboard            ClusterIP   10.110.113.240   <none>        7000/TCP         3h

The first service is for reporting the Prometheus metrics, while the latter service is for the dashboard. If you are on a node in the cluster, you will be able to connect to the dashboard by using either the DNS name of the service at http://rook-ceph-mgr-dashboard:7000 or by connecting to the cluster IP, in this example at http://10.110.113.240:7000.

Viewing the Dashboard External to the Cluster

Commonly you will want to view the dashboard from outside the cluster. For example, on a development machine with the cluster running inside minikube you will want to access the dashboard from the host.

There are several ways to expose a service that will depend on the environment you are running in. You can use an Ingress Controller or other methods for exposing services such as NodePort, LoadBalancer, or ExternalIPs.

The simplest way to expose the service in minikube or similar environment is using the NodePort to open a port on the VM that can be accessed by the host. To create a service with the NodePort, save this yaml as dashboard-external.yaml:

  1. apiVersion: v1
  2. kind: Service
  3. metadata:
  4.   name: rook-ceph-mgr-dashboard-external
  5.   namespace: rook-ceph
  6.   labels:
  7.     app: rook-ceph-mgr
  8.     rook_cluster: rook-ceph
  9. spec:
  10.   ports:
  11.   - name: dashboard
  12.     port: 7000
  13.     protocol: TCP
  14.     targetPort: 7000
  15.   selector:
  16.     app: rook-ceph-mgr
  17.     rook_cluster: rook-ceph
  18.   sessionAffinity: None
  19.   type: NodePort

Now create the service:

  1. $ kubectl create -f dashboard-external.yaml

You will see the new service rook-ceph-mgr-dashboard-external created:

  1. $ kubectl -n rook-ceph get service
  2. NAME                               TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
  3. rook-ceph-mgr                      ClusterIP   10.108.111.192   <none>        9283/TCP         4h
  4. rook-ceph-mgr-dashboard            ClusterIP   10.110.113.240   <none>        7000/TCP         4h
  5. rook-ceph-mgr-dashboard-external   NodePort    10.101.209.6     <none>        7000:31176/TCP   4h

In this example, port 31176 will be opened to expose port 7000 from the ceph-mgr pod. Find the ip address of the VM. If using minikube, you can minikube ssh to the machine and ifconfig to find the ip address. Now you can enter the URL in your browser such as http://192.168.99.110:31176 and the dashboard will appear.