Version:

Inject environment variables

This tutorial shows how to inject environment variables into Function.

You can specify environment variables in the Function definition, or define references to the Kubernetes Secrets or ConfigMaps.

Prerequisites

Before you start, make sure you have these tools installed:

Kyma installed on a cluster

Steps

Follow these steps:

Create your ConfigMap

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kubectl create configmap my-config --from-literal config-env="I come from config map"

Create your Secret

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kubectl create secret generic  my-secret  --from-literal secret-env="I come from secret"

Kyma CLI
kubectl

Generate the Function's configuration and sources:
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```
kyma init function --name my-function
```

Define environment variables as part of the Function configuration file. Modify config.yaml with the following:

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name: my-function
namespace: default
runtime: nodejs18
source:
    sourceType: inline
env:
  - name: env1
    value: "I come from function definition"
  - name: env2
    valueFrom:
      configMapKeyRef:
        name: my-config
        key: config-env
  - name: env3
    valueFrom:
      secretKeyRef:
        name: my-secret
        key: secret-env

Use injected environment variables in the handler file. Modify handler.js with the following:

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module.exports = {
    main: function (event, context) {
        envs = ["env1", "env2", "env3"]
        envs.forEach(function(key){
            console.log(`${key}:${readEnv(key)}`)
        });
        return 'Hello Serverless'
    }
}
readEnv=(envKey) => {
    if(envKey){
        return process.env[envKey];
    }
    return
}

Deploy your Function:
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```
kyma apply function
```
Verify whether your Function is running:
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```
kubectl get functions my-function
```