hello-populator

README

Hello World Populator Example

This example demonstrates an extremely simple populator implementation.

How To

Install kubernetes 1.17 or later, and enable the AnyVolumeDataSource feature gate.

Build the image from code:

make all

Make sure you have a repo you can push to, and set the variable

YOUR_REPO=...

Push the image to your repo:

docker tag hello-populator:latest ${YOUR_REPO}/hello-populator:latest
docker push ${YOUR_REPO}/hello-populator:latest

Install the CRD:

kubectl apply -f crd.yaml

Install the controller:

kubectl apply -f deploy.yaml

Create a CR:

kubectl create -f - << EOF
apiVersion: hello.k8s.io/v1alpha1
kind: Hello
metadata:
  name: hello1
spec:
  fileName: test.txt
  fileContents: Hello, world!
EOF

Create a PVC:

kubectl create -f - << EOF
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc1
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 10Mi
  dataSource:
    apiGroup: hello.k8s.io
    kind: Hello
    name: hello1
EOF

Create a job to print the contents of the pre-populated file inside the PVC:

kubectl create -f - << EOF
apiVersion: batch/v1
kind: Job
metadata:
  name: job1
spec:
  template:
    spec:
      containers:
        - name: test
          image: busybox:1.31.1
          command:
            - cat
            - /mnt/test.txt
          volumeMounts:
          - mountPath: /mnt
            name: vol
      restartPolicy: Never
      volumes:
        - name: vol
          persistentVolumeClaim:
            claimName: pvc1
EOF

Wait for the job to complete:

kubectl wait --for=condition=Complete --timeout=120s job/job1

Get the logs from the job to verify that it worked:

kubectl logs job/job1