You can refer to the Installation Guide to setup OpenFunction.

1. Create secret

Follow this guide to create a registry credential.

2. Create function

For sample function below, modify the spec.image field in sample-java-app.yaml to your own container registry address:

apiVersion: core.openfunction.io/v1beta1
kind: Function
metadata:
  name: sample-java-app
spec:
  image: "<your registry name>/sample-buildah-java:latest"

Use the following command to create this Function:

kubectl apply -f sample-java-app.yaml

3. Access function

You can observe the process of a function with the following command:

kubectl get functions.core.openfunction.io
 
NAME                    BUILDSTATE   SERVINGSTATE   BUILDER         SERVING         ADDRESS                                                   AGE
sample-java-app         Succeeded    Running        builder-jgnzp   serving-q6wdp   http://sample-java-app.default.svc.cluster.local/         22m

The Function.status.addresses field provides various methods for accessing functions. Get Function addresses by running following command:

kubectl get function sample-java-app -o=jsonpath='{.status.addresses}'

You will get the following address:

[{"type":"External","value":"http://sample-java-app.default.ofn.io/"},
{"type":"Internal","value":"http://sample-java-app.default.svc.cluster.local/"}]

You can use the following command to create a pod in the cluster and access the function from the pod:

kubectl run curl --image=radial/busyboxplus:curl -i --tty

Access functions by the internal address:

curl http://sample-java-app.default.svc.cluster.local

Access functions by the external address:

To access the function via the Address of type External in Funtion.status, you should configure local domain first, see Configure Local Domain.

curl http://sample-java-app.default.ofn.io