Deploying and Exposing an Nginx Service on Kubernetes with YAML Generation and Scaling

1. Deploy an Nginx instance

Run the following command to create a deployment named nginx using the nginx:1.20 image: kubectl create deployment nginx --image=nginx:1.20 Verify the pod is running: kubectl get pod -o wide Example output shows the pod nginx-7fb9867-cjnzj in the Running state.

2. Expose the Nginx service

Expose the deployment on port 80, targeting container port 8080, using a NodePort:

kubectl expose deployment nginx --port=80 --target-port=8080 --type=NodePort

Check the services and pods: kubectl get pod,svc -o wide The service nginx appears with a NodePort (e.g., 80:31527/TCP).

3. Generate YAML for the exposed service

Use a dry‑run to output the service definition in YAML:

kubectl expose deployment nginx --port=80 --target-port=8080 --type=NodePort --dry-run -o yaml

The resulting YAML includes apiVersion, kind, metadata, labels, selector, and the type: NodePort specification.

4. Dynamic scaling test

List the current deployment to observe replica settings:

kubectl get deployment

5. View all namespaces

Show pods across all namespaces:

kubectl get pods --all-namespaces

6. Generate YAML resource files directly

Create a deployment YAML without applying it:

kubectl create deployment nginx --image=nginx:1.20 --dry-run -o yaml

7. Deprecated method for exporting YAML

The older --export flag is no longer supported; the command shown is:

kubectl get deploy nginx-deployment -o yaml --export > my.deploy.yaml

Finally, the article includes recommended reading links to Redis tutorials and a call to like, share, and follow the author.