PersistentVolumes provide a way to treat storage as a dynamic resource in Kubernetes. This lab will allow you to demonstrate your knowledge of PersistentVolumes. You will mount some persistent storage to a container using a PersistentVolume and a PersistentVolumeClaim.
Create a custom Storage Class by using “`vi localdisk.yml`.
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: localdisk
provisioner: kubernetes.io/no-provisioner
allowVolumeExpansion: true
Finish creating the Storage Class by using kubectl create -f localdisk.yml.
Create the PersistentVolume by using vi host-pv.yml.
kind: PersistentVolume
apiVersion: v1
metadata:
name: host-pv
spec:
storageClassName: localdisk
persistentVolumeReclaimPolicy: Recycle
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
hostPath:
path: /var/output
Finish creating the PersistentVolume by using kubectl create -f host-pv.yml.
Check the status of the PersistenVolume by using kubectl get pv
Create a PersistentVolumeClaim
Start creating a PersistentVolumeClaim for the PersistentVolume to bind to by using vi host-pvc.yml.
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: host-pvc
spec:
storageClassName: localdisk
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 100Mi
Finish creating the PersistentVolumeClaim by using kubectl create -f host-pvc.yml.
Check the status of the PersistentVolume and PersistentVolumeClaim to verify that they have been bound:
kubectl get pv
kubectl get pvc
Create a Pod That Uses a PersistentVolume for Storage
Create a Pod that uses the PersistentVolumeClaim by using vi pv-pod.yml.
apiVersion: v1
kind: Pod
metadata:
name: pv-pod
spec:
containers:
- name: busybox
image: busybox
command: ['sh', '-c', 'while true; do echo Success! > /output/success.txt; sleep 5; done']
Mount the PersistentVolume to the /output location by adding the following, which should be level with the containers spec in terms of indentation:
volumes:
- name: pv-storage
persistentVolumeClaim:
claimName: host-pvc
In the containers spec, below the command, set the list of volume mounts by using:
volumeMounts:
- name: pv-storage
mountPath: /output
Finish creating the Pod by using kubectl create -f pv-pod.yml.
Check that the Pod is up and running by using kubectl get pods.
If you wish, you can log in to the worker node and verify the output data by using cat /var/output/success.txt.
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