Create Kyma Function Using Kyma CLI

Enable the Istio sidecar proxy injection in the default namespace:

kubectl label namespace default istio-injection=enabled --overwrite

If you create a Function in a namespace with enabled Istio sidecar injection, an Istio sidecar proxy is automatically injected to the Function’s Pod during its creation. This makes the Function part of the Istio service mesh. To expose a workload using an APIRule custom resource, it is required to include the workload in the Istio service mesh.

In your terminal, go to your working folder, and run:

kyma function init

If successful, you get the following message:
Functions files of runtime nodejs22 initialized to dir {WORKING_FOLDER_PATH}

You have created 2 files in your working folder:

• handler.js
• package.json

You can check the content of the files with your editor (e.g. Visual Studio Code).

To apply your Function to your Kyma runtime, run:

kyma function create hello-function

If successful, you get the following message:

resource default/hello-function applied

To verify the Function deployment, run:

kyma function get hello-function

If successful, you get the following result:

NAME             CONFIGURED   BUILT   RUNNING   RUNTIME    GENERATION
hello-function   True         True    True      nodejs22   1

In your working folder, create a new YAML file named myapirule.yaml. You can do this using a text editor or by running touch myapirule.yaml in your terminal.

Open the file in your editor and add the following APIRule definition:

apiVersion: gateway.kyma-project.io/v2
kind: APIRule
metadata:
  name: hello-rule
  namespace: default
spec:
  hosts:
    - hello-host
  service:
    name: hello-function
    port: 80
  gateway: kyma-system/kyma-gateway
  rules:
    - path: /*
      methods: ["GET", "POST"]
      noAuth: true

Deploy your APIRule.

kubectl apply -f "{PATH_TO_YOUR_CONFIG_FILE}"

For example:

kubectl apply -f "C:\tools\myapirule.yaml"