Kubernetes Services

Nandhabalan Marimuthu
Nerd For Tech
Published in
2 min readMay 18, 2021

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what is a Kubernetes service?

A service is a type of Kubernetes resource that causes a proxy to be configured to forward requests to a set of pods. The set of pods that will receive traffic is determined by the selector, which matches labels assigned to the pods when they were created. A service is a REST object in Kubernetes whose definition can be posted to Kubernetes apiServer on the Kubernetes master to create a new instance.

Service types:

ClusterIP − This helps in restricting the service within the cluster. It exposes the service within the defined Kubernetes cluster.

NodePort − It will expose the service on a static port on the deployed node. A ClusterIP service, to which NodePort service will route, is automatically created. The service can be accessed from outside the cluster using the NodeIP:nodePort.

Load Balancer − It uses cloud providers’ load balancer. NodePort and ClusterIP services are created automatically to which the external load balancer will route.

Ingress Kubernetes Ingress is an API object that provides routing rules to manage external users’ access to the services in a Kubernetes cluster, typically via HTTPS/HTTP. Ingress allows you to configure and manage these capabilities inside the cluster.

How to create a service?

You can create a service for an existing deployment. I have mentioned how to create a deployment in my previous story →Link

using command prompt:

kubectl expose deployment my-web --port=8080 --target-port=80 --type=LoadBalancer

using yml file

After creating that deployment let us create a LoadBaalance type of service in that same folder and for that, you have to create a service.yml file and paste the below command.

apiVersion: v1
kind: Service
metadata:
name: my-service
spec:
selector:
app: nginx
type: LoadBalancer
ports:
- protocol: TCP
port: 8080
targetPort: 80

At the selector we are giving our app name is nginx as we have deployed in that name and the port should be 8080, as I mentioned above we have given our type as LoadBalancer.

after that run this command in your terminal

kubectl apply -f service.yml

After running this command go to the browser and type localhost:8080 and you can see the welcome page of nginx.

you can check the services using this command

kubectl get svc

That’s it for today. I hope you understand everything and thank you for reading.

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