Kubernetes Container Orchestration Pod Management 5

Question 1

What does `kubectl cordon <node>` do to Pods already running on that node?

Accepted Answer

Marks the node unschedulable but does not affect existing Pods

Answer

kubectl cordon marks a node as unschedulable so no new Pods are placed there, but existing Pods continue running undisturbed.

Question 2

Which Kubernetes resource would you use to ensure exactly one Pod runs on every node in the cluster?

Accepted Answer

DaemonSet

Answer

A DaemonSet automatically ensures one Pod replica runs on each eligible node, including new nodes added to the cluster.

Question 3

What is the function of `spec.containers[].lifecycle.preStop` hook?

Accepted Answer

Executes a command or HTTP call immediately before the container is terminated

Answer

The preStop hook runs before the container receives SIGTERM, allowing it to complete in-flight requests or perform cleanup operations.

Question 4

A Pod is stuck in `Pending` state. Which of the following is NOT a likely cause?

Accepted Answer

The container's liveness probe is failing

Answer

Liveness probe failures affect running containers, not scheduling; a Pod must be running before probes are evaluated.

Question 5

How do you label an existing Pod with `env=production`?

Accepted Answer

kubectl label pod <name> env=production

Answer

kubectl label modifies labels on existing Kubernetes objects; use --overwrite if the label key already exists.

Kubernetes Container Orchestration Practice Test