Add a hack script that generates a manifest with many PVCs

hack/many-volumes.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+
+# Copyright 2022 NetApp, Inc. All Rights Reserved.
+# Licensed under the Apache License, Version 2.0.
+
+# This script was written to enable manual tests in which a large number of Persistent Volume Claims flood Kubernetes 
+# (and, by extension, the driver) at once. Use it to generate a YAML manifest containing a Storage Class and any number 
+# of Persistent Volume Claims that reference it.
+
+# Example usage:
+# cd beegfs-csi-driver/hack
+# Modify NUM_PVCS and SYS_MGMTD_HOST.
+# ./many-volumes.sh
+# kubectl apply -f many-volumes.yaml
+# kubectl logs csi-beegfs-controller-0 beegfs
+# kubectl delete -f many-volumes.yaml
+# kubectl logs csi-beegfs-controller-0 beegfs
+
+NUM_PVCS=100
+SYS_MGMTD_HOST="localhost"
+EXAMPLE_SC_PATH="../examples/k8s/dyn/dyn-sc.yaml"
+EXAMPLE_PVC_PATH="../examples/k8s/dyn/dyn-pvc.yaml"
+
+cat << EOF > many-volumes.yaml
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: many-volumes-sc
+provisioner: beegfs.csi.netapp.com
+parameters:
+  sysMgmtdHost: ${SYS_MGMTD_HOST}
+  volDirBasePath: k8s/many-volumes
+  permissions/mode: "1644"  # Slow down the driver by forcing a mount.
+reclaimPolicy: Delete
+volumeBindingMode: Immediate
+allowVolumeExpansion: false
+EOF
+
+for i in $(seq 0 $(($NUM_PVCS - 1)))
+do
+# Forgo indention here for the sake of readability in the heredoc.
+printf '\n---\n\n' >> many-volumes.yaml
+cat << EOF >> many-volumes.yaml
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: many-volumes-pvc-${i}
+spec:
+  accessModes:
+  - ReadWriteMany
+  resources:
+    requests:
+      storage: 100Gi
+  storageClassName: many-volumes-sc
+EOF
+done