docs: adds docs for ceph

docs/user-guide/rook-ceph.md

@@ -0,0 +1,24 @@
+# Rook Ceph
+
+UnderStack uses Ceph primarily as an OpenStack Glance backend and for pod volumes.
+
+## Accessing Ceph Dashboard
+
+The Ceph admin dashboard is not exposed publicly so a port-forward needs to be
+created and then you'll be able to access the Ceph UI.
+
+``` bash
+kubectl -n rook-ceph port-forward service/rook-ceph-mgr-dashboard 8443:8443
+```
+
+Once the port-forward is running, you can browse to <https://localhost:8443/> to access the Ceph admin dashboard.
+
+### Getting Ceph admin credentials
+
+Username: `admin`
+
+Password:
+
+``` bash
+kubectl -n rook-ceph get secret rook-ceph-dashboard-password -o jsonpath="{.data.password}" | base64 --decode && echo
+```

mkdocs.yml

@@ -127,4 +127,5 @@ nav:
     - user-guide/monitoring.md
     - user-guide/openstack-ironic.md
     - user-guide/openstack-placement.md
+    - user-guide/rook-ceph.md
   - Workflows: workflows/