Version:

Create an inline Function

This tutorial shows how you can create a simple "Hello World" Function in Node.js. The Function's code and dependencies are defined as an inline code in the Function's spec.

TIP: Serverless also allows you to store the Function's code and dependencies as sources in a Git repository. To learn more, read how to Create a Git Function.

TIP: Read about Function’s specification if you are interested in its signature, event and context objects, and custom HTTP responses the Function returns.

NOTE: Read about Istio sidecars in Kyma and why you want them. Then, check how to enable automatic Istio sidecar proxy injection. For more details, see Default Istio setup in Kyma.

Steps

Follow these steps:

Kyma CLI
kubectl
Kyma Dashboard

Export these variables:

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export NAME={FUNCTION_NAME}
export NAMESPACE={FUNCTION_NAMESPACE}

Create your local development workspace.
a. Create a new folder to keep the Function's code and configuration in one place:
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```
mkdir {FOLDER_NAME}
cd {FOLDER_NAME}
```
b. Create initial scaffolding for the Function using the dedicated CLI command:
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```
kyma init function --name $NAME --namespace $NAMESPACE
```
Code and configure.
Open the workspace in your favorite IDE. If you have Visual Studio Code installed, run the following command from the terminal in your workspace folder:
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```
code .
```
It's time to inspect the code and the config.yaml file. Feel free to adjust the "Hello World" sample code.
Deploy and verify.
a. Call the apply command from the workspace folder. It will build the container and run it on the Kyma runtime pointed by your current KUBECONFIG file:
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```
kyma apply function
```
b. Check if your Function was created successfully:
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```
kubectl get functions $NAME -n $NAMESPACE
```
You should get a result similar to this example:
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```
NAME            CONFIGURED   BUILT     RUNNING   RUNTIME    VERSION   AGE
test-function   True         True      True      nodejs18   1         96s
```