Questão 6 - Storage, PV, PVC e Pod Volume

Question 6 | Storage, PV, PVC, Pod volume

Use context: kubectl config use-context k8s-c1-H

Create a new PersistentVolume named safari-pv. It should have a capacity of 2Gi, accessMode ReadWriteOnce, hostPath /Volumes/Data and no storageClassName defined.

Next create a new PersistentVolumeClaim in Namespace project-tiger named safari-pvc . It should request 2Gi storage, accessMode ReadWriteOnce and should not define a storageClassName. The PVC should bound to the PV correctly.

Finally create a new Deployment safari in Namespace project-tiger which mounts that volume at /tmp/safari-data. The Pods of that Deployment should be of image httpd:2.4.41-alpine.

---

Let's create our persistent volume, get the example from the documentation

# /opt/course/6/pv.yaml
kind: PersistentVolume
apiVersion: v1
metadata:
 name: safari-pv
spec:
 capacity:
  storage: 2Gi
 accessModes:
  - ReadWriteOnce # Fun fact: hostPath only uses ReadWriteOnce
 hostPath:  # Be familiar with this
  path: "/Volumes/Data"

# being in the file directory
kubectl apply -f pv.yaml

Now let's create a pvc in the specified namespace. Get the example from the documentation.

# /opt/course/6/pvc.yaml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: safari-pvc
  namespace: project-tiger
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
     storage: 2Gi

# being in the file directory
kubectl apply -f pvc.yaml

# And we can already check if it did the binding
k get pv,pvc  -n project-tiger
NAME                         CAPACITY  ... STATUS   CLAIM                    ...
persistentvolume/safari-pv   2Gi       ... Bound    project-tiger/safari-pvc ...

NAME                               STATUS   VOLUME      CAPACITY ...
persistentvolumeclaim/safari-pvc   Bound    safari-pv   2Gi      ...

# And let's create the deployment that was requested. Let's create the template and edit it later
k create deploy safari -n project-tiger --image=httpd:2.4.41-alpine --dry-run=client -o yaml > /opt/course/6/deploy.yaml

Let's edit the file.

# /opt/course/6/deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: safari
  name: safari
  namespace: project-tiger
spec:
  replicas: 1
  selector:
    matchLabels:
      app: safari
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: safari
    spec:
      containers:
      - image: httpd:2.4.41-alpine
        name: container
        volumeMounts:                               # add
        - name: vol                                 # add
          mountPath: /tmp/safari-data               # add
      volumes:                                      # add
      - name: vol                                   # add
        persistentVolumeClaim:                      # add
          claimName: safari-pvc                     # add

Let's apply and check.

# being in the file directory
kubectl apply -f deploy.yaml
# We can do a describe on the pvc or pod to check if it was mounted.