Conquer the CKAD Challenge 2025: Unleash Your Kubernetes Power!

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What happens if a node in a Kubernetes cluster becomes unresponsive?

The system ignores the node until it responds

The kube-controller-manager takes action based on node conditions

When a node in a Kubernetes cluster becomes unresponsive, the kube-controller-manager plays a crucial role in maintaining the overall health of the cluster. It regularly monitors the status of nodes through a process known as node health checks. If a node is detected to be unresponsive, the kube-controller-manager will update the node's status to "NotReady".

From this point, the controller can take various actions, such as marking the node as unavailable for scheduling new pods and potentially evicting the pods that are running on that node. This eviction process helps ensure that those workloads are rescheduled on other healthy nodes within the cluster, thus maintaining application availability.

This behavior is essential in Kubernetes for ensuring high availability and resiliency in applications, as it allows the cluster to dynamically adapt to changes in node status without manual intervention.

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All pods on that node are automatically deleted

The cluster logs the incident and continues operating

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