CKA PRACTICE LAB

🧩 TASK 1 — Pod Fails to Start (ImagePullBackOff)

Setup (run first)

kubectl run broken-pod --image=nginx:1.250

Task

A pod named broken-pod exists.

The pod is not in a Running state.

Fix the issue so the pod reaches the Running state.

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🧩 TASK 2 — Service Has No Endpoints

Setup (run first)

kubectl create deployment web --image=nginx
kubectl expose deployment web --port=80 --target-port=80
kubectl patch svc web -p '{"spec":{"selector":{"app":"wrong"}}}'

Task

A Deployment and Service named web exist.

Pods are running, but traffic sent to the Service does not reach the application.

Fix the issue so the Service routes traffic correctly.

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🧩 TASK 3 — CrashLoopBackOff Deployment (Command Issue)

Setup (run first)

kubectl create deployment api --image=nginx
kubectl patch deployment api -p '
{
  "spec": {
    "template": {
      "spec": {
        "containers": [
          {
            "name": "nginx",
            "image": "nginx",
            "command": ["wrong-command"]
          }
        ]
      }
    }
  }
}'

Task

A Deployment named api exists.

One or more Pods are in CrashLoopBackOff.

Fix the Deployment so all Pods are running and stable.

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🧩 TASK 4 — Pods Running but Not Ready

Setup (run first)

kubectl create deployment frontend --image=nginx
kubectl expose deployment frontend --port=80 --target-port=80
kubectl patch deployment frontend -p '
{
  "spec": {
    "template": {
      "spec": {
        "containers": [
          {
            "name": "nginx",
            "image": "nginx",
            "readinessProbe": {
              "tcpSocket": {
                "port": 9999
              },
              "initialDelaySeconds": 5,
              "periodSeconds": 5
            }
          }
        ]
      }
    }
  }
}'

Task

Pods created by the Deployment are running but not Ready.

Traffic sent to the Service does not reach the application.

Fix the issue so Pods become Ready and traffic flows correctly.

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🧩 TASK 5 — CrashLoopBackOff Due to ConfigMap

Setup (run first)

kubectl create configmap app-config --from-literal=PORT=8080

kubectl apply -f - <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: app
spec:
  replicas: 1
  selector:
    matchLabels:
      app: app
  template:
    metadata:
      labels:
        app: app
    spec:
      containers:
      - name: app
        image: nginx
        env:
        - name: APP_PORT
          valueFrom:
            configMapKeyRef:
              name: app-config
              key: APP_PORT
EOF

Task

A Deployment named app exists.

Pods are in CrashLoopBackOff.

The application depends on configuration from a ConfigMap.

Fix the configuration so the Pods run successfully.

---

🧩 TASK 6 — Deployment Rollout Not Progressing

Setup (run first)

kubectl create deployment rollout --image=nginx
kubectl patch deployment rollout -p '
{
  "spec": {
    "template": {
      "spec": {
        "containers": [
          {
            "name": "nginx",
            "image": "nginx",
            "command": ["bad-command"]
          }
        ]
      }
    }
  }
}'

Task

A Deployment named rollout exists.

The Deployment shows available replicas, but one or more Pods are unhealthy.

Fix the Deployment so the rollout completes successfully.

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🧹 Cleanup (Optional)

kubectl delete pod broken-pod
kubectl delete deployment web api frontend app rollout
kubectl delete svc web frontend
kubectl delete configmap app-config

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✅ Completion Check

For each task, confirm:

kubectl get pods

Expected final state:

READY   1/1
STATUS  Running