Question

A team packages a web server whose configuration must be provided as a file at /etc/app/config.yaml inside the container. The configuration content is stored in a ConfigMap named app-config under the key config.yaml. Which approach correctly delivers this file into the Pod?

Accepted Answer

Mount the ConfigMap as a volume and mount that volume at /etc/app, so the key config.yaml appears as a file

Answer

Reference the ConfigMap key with envFrom so it becomes an environment variable the app reads on startup

Answer

Use a Secret instead, since only Secrets can be mounted as files inside a container

Answer

Add the ConfigMap name to the Pod's spec.imagePullSecrets so the kubelet injects the file at build time