add CVMFS deployment and add the volume to the jhub release

infrastructure/cluster/flux/cvmfs/README.md

@@ -0,0 +1,10 @@
+# CVMFS 
+## CVMFS on the VRE
+
+CERN OpenStack k8s cluster v1.29.2 is deployed with a `cvmfs StorageClass` provisioned by `cvmfs.csi.cern.ch` and the CVMFS CSI (Container Storage Interface) plugin [link to github repository](https://github.com/cvmfs-contrib/cvmfs-csi). Version `cvmfs-csi-v2.3.2` of the CVMFS charts is installed.
+
+To provision a cvmfs volume within any jupyterhub pod:
+* Create a `pvc` making use of the cvms `StorageClass`
+* Add an `extraVolumes` and an `extraVolumeMounts` in the [JupyterHub release manifest](../jhub/jhub-release.yaml).
+
+The manifests in this directory will also deploy a pod (`cvmfs-client`) to access cvmfs from the cluster.

infrastructure/cluster/flux/cvmfs/cvmfs-client.yaml

@@ -0,0 +1,20 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: cvmfs-client
+  namespace: jhub
+spec:
+  containers:
+   - name: idle
+     image: busybox
+     imagePullPolicy: IfNotPresent
+     command: [ "/bin/sh", "-c", "trap : TERM INT; (while true; do sleep 1000; done) & wait" ]
+     volumeMounts:
+       - name: cvmfs
+         mountPath: /cvmfs
+         # CVMFS automount volumes must be mounted with HostToContainer mount propagation.
+         mountPropagation: HostToContainer
+  volumes:
+   - name: cvmfs
+     persistentVolumeClaim:
+       claimName: cvmfs-vre-pvc

infrastructure/cluster/flux/cvmfs/cvmfs-pvc.yaml

@@ -0,0 +1,32 @@
+
+# Based on docs and snippets from https://github.com/cvmfs-contrib/cvmfs-csi
+
+# Create StorageClass for provisioning CVMFS automount volumes,
+# and a PersistentVolumeClaim that's fulfilled by the StorageClass.
+
+# If Controller plugin is not deployed, follow the example in volume-pv-pvc.yaml.
+
+# Notes for the VRE cluster.
+# StorageClass is not needed because is already deployed when starting the cluster.
+# Othersiwe, have a look to the documentation on the link above
+# ---
+# apiVersion: storage.k8s.io/v1
+# kind: StorageClass
+# metadata:
+#   name: cvmfs
+# provisioner: cvmfs.csi.cern.ch
+# ---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: cvmfs-vre-pvc
+  namespace: jhub
+spec:
+  accessModes:
+  - ReadOnlyMany
+  resources:
+    requests:
+      # Volume size value has no effect and is ignored
+      # by the driver, but must be non-zero.
+      storage: 1
+  storageClassName: cvmfs

infrastructure/cluster/flux/jhub/jhub-release.yaml

@@ -31,7 +31,6 @@ spec:
     - kind: ConfigMap
       name: jhub-profiles
       valuesKey: values.yaml
-      #targetPath: singleuser.profileList
 
   values:
     proxy:
@@ -147,18 +146,18 @@ spec:
         type: static
         static:
           pvcName: jhub-vre-singleuser-preprovisioned-manila-pvc # manually added an existing share (refer to jhub-storage.yaml)
-        # extraVolumes:
-        #   - name: cvmfs-cern-instance 
-        #     persistentVolumeClaim:
-        #       claimName: cvmfs
+        extraVolumes:
+          - name: cvmfs-vre
+            persistentVolumeClaim:
+              claimName: cvmfs-vre-pvc
         #   - name: eulake-cern-eos-rse # mounts the EOS RSE needed for the Rucio JupiterLab extension
         #     hostPath:
         #       path: /var/eos/eulake # This is pointing to /eos/eulake/escape/data, defined on the eosxd/configmap  
-        # extraVolumeMounts:
-        #   - name: cvmfs-cern-instance 
-        #     mountPath: /cvmfs
-        #     # CVMFS automount volumes must be mounted with HostToContainer mount propagation.
-        #     mountPropagation: HostToContainer
+        extraVolumeMounts:
+          - name: cvmfs-vre
+            mountPath: /cvmfs
+            # CVMFS automount volumes must be mounted with HostToContainer mount propagation.
+            mountPropagation: HostToContainer
         #   - name: eulake-cern-eos-rse # mounts the EOS RSE needed for the Rucio JupiterLab extension
         #     mountPath: /eos/cern-eos-rse
         #     mountPropagation: HostToContainer