Update Kubernetes

Kubernetes.md

@@ -225,6 +225,47 @@ then apply it:
 kubectl apply -f file.yml
 ```
 
+### Additional storage class
+The default storage class that comes with this configuration:
+```
+kind: StorageClass
+apiVersion: storage.k8s.io/v1
+metadata:
+  name: longhorn
+provisioner: driver.longhorn.io
+allowVolumeExpansion: true
+reclaimPolicy: "Retain"
+volumeBindingMode: Immediate
+parameters:
+  numberOfReplicas: "3"
+  staleReplicaTimeout: "30"
+  fromBackup: ""
+  fsType: "ext4"
+  dataLocality: "disabled"
+  unmapMarkSnapChainRemoved: "ignored"
+```
+
+You may want to create a new storage class with a different config, for example,
+if you prefer performance over redundancy and want to save space. 
+```
+kind: StorageClass
+apiVersion: storage.k8s.io/v1
+metadata:
+  name: longhorn-fast
+provisioner: driver.longhorn.io
+allowVolumeExpansion: true
+reclaimPolicy: "Retain"
+volumeBindingMode: Immediate
+parameters:
+  numberOfReplicas: "1"
+  staleReplicaTimeout: "30"
+  fromBackup: ""
+  fsType: "ext4"
+  dataLocality: "best-effort"
+  unmapMarkSnapChainRemoved: "ignored"
+```
+
+
 # Kubernetes Dashboard
 
 I you want to be extra fancy you can deploy a web UI Dashboard for your kubernetes.