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Latchu@DevOps
Latchu@DevOps

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🎯 Scenario #9 — Create a Deployment, Roll Out an Updated Version and Rollback

#kubernetes #devops #cicd #containers

This scenario covers:

  • Creating a Deployment
  • Verifying rollout
  • Updating image (rolling update)
  • Verifying rollout status
  • Checking rollout history
  • Performing rollback

✅ Step 1 — Create the Deployment (nginx v1)

Create file:

# deploy-nginx.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deploy
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx-app
  template:
    metadata:
      labels:
        app: nginx-app
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80
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Apply:

kubectl apply -f deploy-nginx.yaml
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✅ Step 2 — Verify Deployment & Pods

Check Deployment:

kubectl get deploy
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Check ReplicaSet (auto-created by Deployment):

kubectl get rs
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Check Pods:

kubectl get pods -l app=nginx-app -o wide
or
kubectl get pods -o wide
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You should see 3 Pods from a ReplicaSet.

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✅ Step 3 — Observe Rollout Status 

kubectl rollout status deployment/nginx-deploy
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Expected:

deployment "nginx-deploy" successfully rolled out
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🎨 Step 4 — Update Deployment (Rolling Update)

Let’s update the container image from 1.21 → 1.25 using YAML edit:

kubectl apply -f deploy-nginx.yaml
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📡 Step 5 — Watch Rolling Update in Real Time 

kubectl get pods -l app=nginx-app -w
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You will see:

  • old pods terminating
  • new pods starting

Rolling updates replace pods gradually → ensures zero downtime.

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🕵️‍♂️ Step 6 — Check Rollout History 

kubectl rollout history deployment/nginx-deploy
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You will see revisions:

deployment.apps/nginx-deploy
REVISION  CHANGE-CAUSE
1         <none>
2         kubectl set image deployment/nginx-deploy nginx=nginx:1.25
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🔄 Step 7 — Rollback Deployment (If Needed)

Rollback to previous revision:

kubectl rollout undo deployment/nginx-deploy
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Verify again:

kubectl rollout status deployment/nginx-deploy
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🧹 Step 8 — Validate Final Pods 

kubectl get pods -l app=nginx-app -o wide
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You will see pods with the updated (or rolled back) version.

🌟 Thanks for reading! If this post added value, a like ❤️, follow, or share would encourage me to keep creating more content.

— Latchu | Senior DevOps & Cloud Engineer

☁️ AWS | GCP | ☸️ Kubernetes | 🔐 Security | ⚡ Automation
📌 Sharing hands-on guides, best practices & real-world cloud solutions

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