? Deploying Your First App on Kubernetes (With YAML Examples)

[Lomanu4]

Kubernetes can feel overwhelming at first , all the YAML, pods, deployments, services... But once you deploy your first app, things start to click.

In this guide, we’ll walk through deploying a simple Nginx web server to a Kubernetes cluster, using just a few YAML files.

? What We’re Deploying


We’ll use:

• A Deployment – to manage our pods
• A Service – to expose our app
• Optionally, a NodePort – to access it from a browser

? Step 1: Create a Deployment


Let’s create a deployment to run two replicas of the nginx container.

File: nginx-deployment.yaml


apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
spec:
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.25
ports:
- containerPort: 80

Apply it:


kubectl apply -f nginx-deployment.yaml

Check status:


kubectl get deployments
kubectl get pods
? Step 2: Expose the App with a Service


To make the app accessible, define a Service.

File: nginx-service.yaml


apiVersion: v1
kind: Service
metadata:
name: nginx-service
spec:
selector:
app: nginx
ports:
- protocol: TCP
port: 80
targetPort: 80
type: NodePort

Apply it:


kubectl apply -f nginx-service.yaml

Check the port:


kubectl get svc nginx-service

Look for the NodePort, e.g., 30007.

? Step 3: Access the App

• If you're using Minikube:

minikube service nginx-service

• If you're using Docker Desktop or a cloud cluster:

Open http://<NODE-IP>:<NODE-PORT> in your browser.

? Bonus: Clean Up


To delete the resources:


kubectl delete -f nginx-deployment.yaml
kubectl delete -f nginx-service.yaml
? Summary


You just:

1. Created a Kubernetes deployment for Nginx
2. Exposed it using a service
3. Accessed it via browser or CLI
4. Learned the basics of kubectl and YAML syntax

? Next Steps


Try:

• Replacing Nginx with your own app image
• Using ConfigMaps or Secrets for configuration
• Exploring Ingress controllers
• Scaling your deployment with kubectl scale

#kubernetes #devops #k8s #containers #yaml #cloudnative

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