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

Field	Description	Example
`type`	Service exposure method (ClusterIP, NodePort, LoadBalancer)	`NodePort`
`selector`	Matches Pods by label	`app: myapp`
`ports.port`	Port exposed inside the cluster	`80`
`ports.targetPort`	Port on the Pod that receives traffic	`80`
`ports.nodePort`	Port on each Node for external access (30000–32767)	`30004`

NodePort Services allocate a port between 30000 and 32767. If you omit nodePort, Kubernetes assigns one automatically.

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:

Using your node’s IP address:

minikube ip   # If you're on Minikube

Then open your browser at

http://<NODE_IP>:30004

Using Minikube’s service tunnel:

minikube service myapp-service --url

This outputs a URL such as:

http://192.168.99.101:30004

Exposing a Service via NodePort makes it accessible externally on the node’s network. Ensure your firewall rules and security groups are configured appropriately.

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

The image shows a default "Welcome to nginx!" page, indicating that the nginx web server is successfully installed and running, but further configuration is required.

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

Watch Video

Services NodePort

Services ClusterIP

Introduction

Docker Engine

Docker Image Management

Docker Engine - Security

Docker Engine - Networking

Docker Engine - Storage

Docker Compose

Docker Swarm

Kubernetes

Docker Engine Enterprise

Docker Trusted Registry

Disaster Recovery

Prerequisites

Step 1: Define the Service

Service Specification Breakdown

Step 2: Verify the Service

Step 3: Access the Application

Next Steps

Links and References

Watch Video

​Prerequisites

​Step 1: Define the Service

​Service Specification Breakdown

​Step 2: Verify the Service

​Step 3: Access the Application

​Next Steps

​Links and References

Watch Video

Prerequisites

Step 1: Define the Service

Service Specification Breakdown

Step 2: Verify the Service

Step 3: Access the Application

Next Steps

Links and References