Source: Dev.to | Jan 08, 2026 (UTC)
kubectl edit 🟢 BASELINE (RUN ON EVERY MACHINE)
minikube start --driver=docker
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kubectl create namespace cka-lab kubectl config set-context --current --namespace=cka-lab
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Step 2 — Apply BASE WORKLOAD (DO NOT MODIFY)
kubectl apply -f - <<EOF apiVersion: apps/v1 kind: Deployment metadata: name: web-app spec: replicas: 4 selector: matchLabels: app: web template: metadata: labels: app: web spec: containers: - name: nginx image: nginx:1.25 ports: - containerPort: 80 EOF
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Step 3 — Apply BASE SERVICE (DO NOT MODIFY)
kubectl apply -f - <<EOF apiVersion: v1 kind: Service metadata: name: web-svc spec: selector: app: web ports: - port: 80 targetPort: 80 type: ClusterIP EOF
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Step 4 — Traffic test pod (keep running)
kubectl run traffic --image=busybox -it --rm -- sh
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Inside:
while true; do wget -qO- web-svc echo "-----" sleep 1 done
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🧪 TASK 1 — ROLLING UPDATE MISCONFIGURATION
kubectl patch deployment web-app -p ' { "spec": { "strategy": { "type": "RollingUpdate", "rollingUpdate": { "maxUnavailable": 4, "maxSurge": 0 } } } }'
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🧪 TASK 2 — BROKEN IMAGE DEPLOYMENT
kubectl set image deployment/web-app nginx=nginx:doesnotexist
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🧪 TASK 3 — MISSING READINESS PROBE
kubectl patch deployment web-app --type=json -p='[ { "op": "remove", "path": "/spec/template/spec/containers/0/readinessProbe" } ]'
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🧪 TASK 4 — SERVICE TRAFFIC FAILURE
kubectl patch svc web-svc -p ' { "spec": { "selector": { "app": "wrong" } } }'
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Endpoints populated🧪 TASK 5 — CANARY DEPLOYMENT (TRAFFIC LEAK)
kubectl create deployment web-app-canary --image=nginx:1.27 --replicas=1 kubectl label deployment web-app-canary track=canary
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(canary from previous task is faulty)
🧪 TASK 7 — PAUSED ROLLOUT INCIDENT
kubectl rollout pause deployment web-app kubectl set image deployment/web-app nginx=nginx:1.26
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🧪 TASK 8 — NODEPORT ACCESS FAILURE
kubectl patch svc web-svc -p ' { "spec": { "type": "NodePort" } }'
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Traffic still unreachable.
kubectl scale deployment web-app --replicas=0
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kubectl get all
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