Scenario

An application requires multiple configuration values mounted as files.

Task

Create a ConfigMap and mount it into a pod so all keys are accessible as files.

Step 1: Create the ConfigMap with multiple keys

kubectl create configmap settings --from-literal=MODE=dev --from-literal=VERSION=1.0

Step 2: Generate pod template

kubectl run config-pod --image=busybox:latest --dry-run=client -o yaml --command -- sleep 3600 > pod.yaml

Step 3: Edit pod.yaml to add volume and volumeMount

Add under containers[0]:

    volumeMounts:
    - name: config-volume
      mountPath: /etc/config

Add under spec:

  volumes:
  - name: config-volume
    configMap:
      name: settings

Step 4: Apply and verify

kubectl apply -f pod.yaml
kubectl exec config-pod -- ls /etc/config
kubectl exec config-pod -- cat /etc/config/MODE
kubectl exec config-pod -- cat /etc/config/VERSION