Pod stuck in Pending state in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does it mean when a Kubernetes Pod is in the Pending state?

A Pod in Pending state means Kubernetes has accepted the Pod request but has not yet scheduled it to run on any node.

beginner

Name one common reason why a Pod might stay in Pending state.

One common reason is that there are not enough resources (CPU, memory) available on any node to run the Pod.

beginner

Which command helps you check why a Pod is stuck in Pending state?

Use `kubectl describe pod ` to see detailed events and messages explaining why the Pod is Pending.

intermediate

How can node selectors affect a Pod stuck in Pending state?

If a Pod has node selectors that don't match any available node, Kubernetes cannot schedule it, so it stays Pending.

intermediate

What is a quick way to check if your cluster has enough resources for a Pending Pod?

Check node resource usage with `kubectl get nodes` and `kubectl describe node ` to see available CPU and memory.

What does the Pending state of a Pod indicate?

A Pod is waiting to be scheduled on a node

B Pod is running successfully

C Pod has completed its task

D Pod is being deleted

Pending means the Pod is accepted but not yet assigned to a node.

Which command helps diagnose why a Pod is Pending?

A kubectl delete pod <pod-name>

B kubectl get services

C kubectl logs <pod-name>

D kubectl describe pod <pod-name>

The describe command shows events and reasons for Pending state.

If no nodes have enough CPU or memory, what happens to the Pod?

A It restarts repeatedly

B It runs on any node anyway

C It stays in Pending state

D It gets deleted automatically

Pods cannot be scheduled without enough resources, so they remain Pending.

What role do node selectors play in Pod scheduling?

A They restrict which nodes a Pod can run on

B They increase Pod resource limits

C They delete nodes automatically

D They change Pod container images

Node selectors limit scheduling to nodes matching specific labels.

Which kubectl command shows node resource availability?

A kubectl logs <pod-name>

B kubectl describe node <node-name>

C kubectl get pods

D kubectl exec <pod-name>

Describing a node shows its CPU and memory usage and capacity.

Explain the main reasons a Kubernetes Pod might stay in Pending state and how to check them.

Think about scheduling and resource availability.

Describe the steps you would take to troubleshoot a Pod stuck in Pending state.

Start from the Pod, then look at nodes and scheduling rules.