Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

A Pod specification consumes the same ConfigMap in two different ways: the full ConfigMap is mounted at "/etc/app/conf" (no subPath), and several keys are also injected into the container by means of envFrom. After you apply an updated version of the ConfigMap, the files inside "/etc/app/conf" change within about a minute, yet the environment variables inside the still-running container keep their original values. Which statement best explains this behavior?

  • Any change to a ConfigMap automatically triggers the kube-controller-manager to recreate affected Pods, so both files and environment variables should have updated; the difference indicates a failed health probe.

  • ConfigMaps are treated as immutable while a Pod is running; neither volume mounts nor environment variables can update until the Pod is manually deleted.

  • The kubelet refreshes a ConfigMap that is mounted as a volume, but environment variables sourced from that ConfigMap are fixed at container start-up, so they remain unchanged until the Pod is restarted.

  • Environment variables sourced from a ConfigMap are refreshed every kubelet sync cycle, whereas files from the same ConfigMap stay static unless the Deployment is rolled.

CompTIA Linux+ XK0-006 (V8)
Automation, Orchestration, and Scripting
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