<s>[INST] create k8s service yml file [/INST] Here's an example of a Kubernetes Service YAML file for a Deployment:

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

This YAML file creates a Service named `my-service` that selects Pods with the label app: `my-app` and exposes them on a ClusterIP type service on port 80, which will be forwarded to target port 8080 on the selected Pods.

Note: This is just an example and may need to be adjusted based on the specifics of your deployment and requirements.</s>\ <s>[INST] How can I change the port to 4000? [/INST] Changing to port to 4000 can be done by changing the value of the `port` field in the Service YAML file. For example, to change the port to 4000, you would update the YAML file to the following:

```yaml
apiVersion: v1
kind: Service
metadata:
  name: my-service
spec:
  selector:
    app: my-app
  ports:
  - name: http
    port: 4000
    targetPort: 8080
  type: ClusterIP```

You can also update the `targetPort` to match the `port` value, but this isn't required.</s>\ <s>[INST] Ok [/INST] 