新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch05/cloneDefaultStorageClass.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+# Kubernetes uses an annotation to mark the default storage class rather than a label,
+# so that needs a JSONPath query - plus there are different annotation keys for 
+# different Kubernetes versions. This finds the configured default and writes the spec as JSON:
+kubectl get sc $(kubectl get storageclass -o jsonpath="{range .items[?(@.metadata.annotations.storageclass\.kubernetes\.io/is-default-class == 'true')]}{.metadata.name}") $(kubectl get storageclass -o jsonpath="{range.items[?(@.metadata.annotations.storageclass\.beta\.kubernetes\.io/is-default-class == 'true')]}{.metadata.name}") -o json > defaultStorageClass.json
+
+# create a pod which has some tools and a script we can use to clone the sc definition:
+kubectl apply -f  storageClass/clone-storageClass-script.yaml 
+
+# wait for the pod:
+kubectl wait --for=condition=Ready pod/clone-sc
+
+# copy the default sc spec into the cloning pod:
+kubectl cp defaultStorageClass.json clone-sc:/defaultStorageClass.json
+
+# run the clone script, which generates a custom sc defintion:
+kubectl exec clone-sc -- /scripts/duplicate-default-storage-class.sh > kiamolStorageClass.json
+
+# apply the new sc:
+kubectl apply -f kiamolStorageClass.json
+
+# and remove the cloning pod:
+kubectl delete -f  storageClass/clone-storageClass-script.yaml