How to create a kubernetes service for nginx pods

Before creating the service, we need to add label on POD so that service able to find it.

Add and check the Label to Your Pod

The Service looks for Pods labeled app=nginx for your challenge.

-- Add label 
kubectl label pod nginx app=nginx --overwrite
output:
pod/nginx labeled
-- Confirm that label is added
kubectl get pods --show-labels
output:
NAME    READY   STATUS    RESTARTS   AGE   LABELS
nginx   1/1     Running   0          20m   app=nginx

Why Are Labels Important?

Labels are like key pairs that help Kubernetes organize your resources. The label app=nginx tells your Service which Pod to target. Without this label, your Service won’t know where to direct your traffic.

Create the YAML Manifest for the Service

Create a YAML manifest need to open file in a text editor:

nano nginx-service.yaml
-- add the following in file:
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  selector:
    app: nginx
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80
  type: ClusterIP

Explain:

• metadata.name: This names the Service nginx-service so you can easily find it later.
• kind: Service: This line means you’re setting up a Service resource
• spec.selector: This selects Pods that have the label app: nginx. It ensures that traffic sent to this Service goes to your NGINX Pod.
• ports: This opens port 80, so any incoming traffic on the Service’s port 80 gets sent to the Pod’s port 80.
• type: ClusterIP: This gives the Service a steady internal IP address, making it only accessible within the cluster.

Deploy a Simple Web Application with Kubernetes

Create the YAML Manifest for the Service. Apply the YAML Manifest

kubectl apply -f nginx-service.yaml
output:
service/nginx-service created

Note: kubectl apply reads the Service’s YAML and instructs Kubernetes to create or update the Service. It’s an additional layer for your application’s infrastructure. The good news is that you now have both a Pod and a Service.

Verify the Service:

kubectl get services
NAME            TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
kubernetes      ClusterIP   10.96.0.1       <none>        443/TCP   147m
nginx-service   ClusterIP   10.111.81.162   <none>        80/TCP    102s

To get more information about the Service, you need to run the following command:

kubectl describe service nginx-service

Test Using CURL

Your Service is now internal to the cluster. To test it, use kubectl port-forward to send traffic to the Service, just like you did with your Pod. You can also use curl to check the Service and get quick responses without using a browser.

kubectl port-forward service/nginx-service 8080:80
output:
Forwarding from 127.0.0.1:8080 -> 80
Forwarding from [::1]:8080 -> 80
-- for testing using CURL command in new terminal
curl http://localhost:8080

Test using web browser also: localhost:8080