acg-part-07.md

Create a PersistentVolume

Switch to the acgk8s context:

kubectl config use-context acgk8s

Create a YAML file named localdisk.yml:

vim localdisk.yml

In the file, add the following:

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: localdisk
provisioner: kubernetes.io/no-provisioner
allowVolumeExpansion: true

Create a storage class using the YAML file:

kubectl create -f localdisk.yml

Create a YAML file named host-storage-pv.yml:

vim host-storage-pv.yml

In the file, add the following:

apiVersion: v1
kind: PersistentVolume
metadata:
  name: host-storage-pv
spec:
  storageClassName: localdisk
  persistentVolumeReclaimPolicy: Recycle
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: /etc/data

Create the PersistentVolume:

kubectl create -f host-storage-pv.yml

Check the status of the volume:

kubectl get pv host-storage-pv

Check the status of the exam objectives:

./verify.sh

Create a Pod That Uses the PersistentVolume for Storage

Create a YAML file named host-storage-pvc.yml:

vim host-storage-pvc.yml

In the file, paste the following:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: host-storage-pvc
  namespace: auth
spec:
  storageClassName: localdisk
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 100Mi

Create the PersistentVolumeClaim * in the same namespace as the pod:

kubectl create -f host-storage-pvc.yml

Check the status of the PersistentVolumeClaim:

kubectl get pv

Verify that the claim is bound to the volume:

kubectl get pvc -n auth

Create a YAML file named pv-pod.yml:

vim pv-pod.yml

In the file, paste the following:

apiVersion: v1
kind: Pod
metadata:
  name: pv-pod
  namespace: auth
spec:
  containers:
  - name: busybox
    image: busybox
    command: ['sh', '-c', 'while true; do echo success > /output/output.log; sleep 5; done']
    volumeMounts:
    - name: pv-storage
      mountPath: /output
  volumes:
  - name: pv-storage
    persistentVolumeClaim:
      claimName: host-storage-pvc

Create the pod:

kubectl create -f pv-pod.yml

Check the status of the exam objectives:

./verify.sh

Expand the PersistentVolumeClaim

Edit host-storage-pvc:

kubectl edit pvc host-storage-pvc -n auth

Under spec, change the storage value to 200Mi.

Check the status of the exam objectives:

./verify.sh