Pod in CrashLoopBackOff in Kubernetes - Mini Project: Build & Apply

Troubleshooting a Pod in CrashLoopBackOff

📖 Scenario: You are managing a Kubernetes cluster. One of your application pods is stuck in the CrashLoopBackOff state. This means the pod keeps crashing and restarting repeatedly.Your task is to identify the problem by checking pod details and logs, then fix the pod configuration to prevent the crash.

🎯 Goal: Learn how to check pod status, view logs, and update pod configuration to fix a CrashLoopBackOff issue in Kubernetes.

📋 What You'll Learn

Use kubectl commands to inspect pod status and logs

Understand pod YAML configuration basics

Edit pod configuration to fix the crash

Apply the fixed configuration and verify pod runs successfully

💡 Why This Matters

🌍 Real World

In real Kubernetes clusters, pods can crash due to misconfiguration or application errors. Knowing how to check pod status, logs, and fix configuration is essential for keeping applications running smoothly.

💼 Career

DevOps engineers and site reliability engineers often troubleshoot pod crashes. This skill helps maintain healthy Kubernetes deployments and ensures application availability.

1

Check Pod Status

Run the command kubectl get pods crashloop-pod to check the status of the pod named crashloop-pod.

Kubernetes

# Run kubectl get pods crashloop-pod to see pod status
# Your code here

Need a hint?

Use kubectl get pods with the pod name to see its current status.

2

View Pod Logs

Run the command kubectl logs crashloop-pod to view the logs of the pod named crashloop-pod. This helps identify why the pod is crashing.

Kubernetes

kubectl get pods crashloop-pod
# Run kubectl logs crashloop-pod to see pod logs
# Your code here

Need a hint?

Use kubectl logs with the pod name to see the container output and error messages.

3

Fix Pod Configuration

Create a YAML file named fixed-pod.yaml with the following content to fix the pod crash by setting the container command to sleep 3600:

apiVersion: v1
kind: Pod
metadata:
  name: crashloop-pod
spec:
  containers:
  - name: app
    image: busybox
    command: ["sleep", "3600"]

Kubernetes

kubectl get pods crashloop-pod
kubectl logs crashloop-pod
# Create fixed-pod.yaml with the fixed pod configuration
# Your code here

Need a hint?

Set the container command to sleep 3600 to keep the pod running without crashing.

4

Apply Fixed Configuration and Verify

Run the commands: kubectl apply -f fixed-pod.yaml to apply the fixed pod configuration, and then kubectl get pods crashloop-pod to verify the pod is running without crashing.

Kubernetes

kubectl get pods crashloop-pod
kubectl logs crashloop-pod
apiVersion: v1
kind: Pod
metadata:
  name: crashloop-pod
spec:
  containers:
  - name: app
    image: busybox
    command: ["sleep", "3600"]
# Run kubectl apply -f fixed-pod.yaml and then kubectl get pods crashloop-pod
# Your code here

Need a hint?

Use kubectl apply -f fixed-pod.yaml to update the pod, then check status with kubectl get pods crashloop-pod.