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ceph-dashboard.md

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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.

  spec:
    dashboard:
      enabled: true

The Rook operator will enable the ceph-mgr dashboard module. A K8s service will be created to expose that port inside the cluster. The ports enabled by Rook will depend on the version of Ceph that is running:

  • Luminous: Port 7000 on http
  • Mimic and newer: Port 8443 on https

This example shows that port 8443 was configured for Mimic or newer.

kubectl -n rook-ceph get service
NAME                         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
rook-ceph-mgr                ClusterIP   10.108.111.192   <none>        9283/TCP         3h
rook-ceph-mgr-dashboard      ClusterIP   10.110.113.240   <none>        8443/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 https://rook-ceph-mgr-dashboard-https:8443 or by connecting to the cluster IP, in this example at https://10.110.113.240:8443.

Credentials

After you connect to the dashboard you will need to login for secure access. Rook creates a default user named admin and generates a secret called rook-ceph-dashboard-admin-password in the namespace where rook is running. To retrieve the generated password, you can run the following:

kubectl -n rook-ceph get secret rook-ceph-dashboard-password -o yaml | grep "password:" | awk '{print $2}' | base64 --decode

Configure the Dashboard

If you are accessing the dashboard via a reverse proxy, you may wish to serve it under a URL prefix. To get the dashboard to use hyperlinks that include your prefix, you can set the urlPrefix setting:

  spec:
    dashboard:
      urlPrefix: /ceph-dashboard

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-https.yaml. (For Luminous you will need to set the port and targetPort to 7000 and connect via http.)

apiVersion: v1
kind: Service
metadata:
  name: rook-ceph-mgr-dashboard-external-https
  namespace: rook-ceph
  labels:
    app: rook-ceph-mgr
    rook_cluster: rook-ceph
spec:
  ports:
  - name: dashboard
    port: 8443
    protocol: TCP
    targetPort: 8443
  selector:
    app: rook-ceph-mgr
    rook_cluster: rook-ceph
  sessionAffinity: None
  type: NodePort

Now create the service:

$ kubectl create -f dashboard-external.yaml

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

$ kubectl -n rook-ceph get service
NAME                                    TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
rook-ceph-mgr                           ClusterIP   10.108.111.192   <none>        9283/TCP         4h
rook-ceph-mgr-dashboard                 ClusterIP   10.110.113.240   <none>        8443/TCP         4h
rook-ceph-mgr-dashboard-external-https  NodePort    10.101.209.6     <none>        8443:31176/TCP   4h

In this example, port 31176 will be opened to expose port 8443 from the ceph-mgr pod. Find the ip address of the VM. If using minikube, you can run minikube ip to find the ip address. Now you can enter the URL in your browser such as https://192.168.99.110:31176 and the dashboard will appear.