How do I create a Kubernetes service YAML file?

How do I create a Kubernetes service YAML file?

To create a Kubernetes service YAML file, you need to define the service type, selector, and ports. Here's a basic example:

apiVersion: v1
kind: Service
metadata:
  name: my-service
spec:
  type: ClusterIP
  selector:
    app: my-app
  ports:
    - port: 80
      targetPort: 8080

This YAML defines a service named 'my-service' that routes traffic to pods labeled with 'app: my-app'.

What are the different types of services I can create?

Kubernetes supports several service types:

1. ClusterIP: Exposes the service on a cluster-internal IP.
2. NodePort: Exposes the service on each node's IP at a static port.
3. LoadBalancer: Exposes the service externally using a cloud provider's load balancer.
4. ExternalName: Maps the service to the contents of the externalName field (e.g., a DNS name).

Can you explain the selector and ports sections?

Sure! The selector section defines how the service finds the pods to route traffic to, based on their labels. The ports section specifies which port the service listens on and which port the target pods are using. For example, if your application runs on port 8080, you would set targetPort: 8080.