Demo Services

In this lesson, you’ll learn how to expose your application Pods in Kubernetes by creating a Service of type NodePort. Services provide stable endpoints for accessing your workloads and enable load balancing across Pods.

Prerequisites

Verify that your Deployment is running and has created Pods:

kubectl get deployment
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
myapp-deployment   6/6     6            6           23m

You should see 6/6 READY, meaning six Pods are available.

Step 1: Define the Service

Create a directory called service (optional) and add a file named service-definition.yaml:

apiVersion: v1
kind: Service
metadata:
  name: myapp-service
spec:
  type: NodePort
  selector:
    app: myapp
  ports:
    - port: 80
      targetPort: 80
      nodePort: 30004

Service Specification Breakdown

Save the file, then apply it:

kubectl apply -f service/service-definition.yaml

Step 2: Verify the Service

Run the following command to list Services in the current namespace:

kubectl get svc

Example output:

NAME            TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)         AGE
kubernetes      ClusterIP   10.96.0.1       <none>        443/TCP         24h
myapp-service   NodePort    10.101.76.121   <none>        80:30004/TCP    5s

• CLUSTER-IP: Internal IP of the Service.
• 80:30004/TCP: Maps Service port 80 to NodePort 30004.

Step 3: Access the Application

There are two ways to reach your application:

1. Using your node’s IP address:

   minikube ip   # If you're on Minikube
   

   Then open your browser at

   http://<NODE_IP>:30004
   

2. Using Minikube’s service tunnel:

   minikube service myapp-service --url
   

   This outputs a URL such as:

   http://192.168.99.101:30004
   

Open the URL in your browser. You should see the default NGINX welcome page:

Next Steps

• Explore other Service types such as ClusterIP and LoadBalancer.
• Learn about Ingress resources for advanced HTTP routing.
• Consult the Kubernetes Services documentation for more details.

Links and References

• Kubernetes Services
• Kubernetes Basics
• Minikube — Quickstart