​Secrets from a ​Helm ​Chart

This page describes how you can add Kestra Secrets to your Helm Chart deployment.

Pass environment variables directly

The simplest way to pass secrets to Kestra is to use environment variables referenced using the extraEnv property. Make sure that each environment variable's key starts with SECRET_ and that the value of the secret is base64 encoded.

Let's assume you want to add two secrets to your Helm Chart:

1. DB_USERNAME with the value admin
2. DB_PASSWORD with the value password

First, let's encode the values:

echo -n "admin" | base64 # it should give you YWRtaW4=
echo -n "password" | base64 # it should give you cGFzc3dvcmQ=

You can set them directly in your Helm Chart values.yaml as follows:

deployment:
  standalone:
    enabled: true
extraEnv:
  - name: SECRET_DB_USERNAME
    value: "YWRtaW4="
  - name: SECRET_DB_PASSWORD
    value: "cGFzc3dvcmQ="

Now, all that's left is to install or upgrade your Helm Chart:

helm repo add kestra https://helm.kestra.io/
helm install kestra kestra/kestra -f values.yaml
# or if you already have Kestra installed:
helm upgrade kestra kestra/kestra -f values.yaml

export POD_NAME=$(kubectl get pods --namespace default -l "app.kubernetes.io/name=kestra,app.kubernetes.io/instance=kestra,app.kubernetes.io/component=standalone" -o jsonpath="{.items[0].metadata.name}")
kubectl port-forward $POD_NAME 8080:8080

To test that the secrets have been correctly set, go to the UI e.g. http://localhost:8080 and create a new flow:

id: secret_test
namespace: company.team
tasks:
  - id: hello
    type: io.kestra.plugin.core.output.OutputValues
    values:
      username: "{{ secret('DB_USERNAME') }}"
      password: "{{ secret('DB_PASSWORD') }}"

Execute the flow and check the output values in the Outputs tab in the UI. You should see the values admin and password.

Pass environment variables from a Kubernetes Secret

If you want to define your secrets in a Kubernetes Secret, you can use the extraSecretEnvFrom property in your Helm Chart. This property allows you to reference an existing Kubernetes Secret and pass its values as environment variables to Kestra.

echo -n "admin" | base64 | base64 # it should give you WVdSdGFXNEsK
echo -n "password" | base64 | base64 # it should give you YzBGemMzZHZjbVFLCg==

Here is an example of a Kubernetes Secret definition:

apiVersion: v1
kind: Secret
metadata:
  name: db-creds
type: Opaque
data: # base64 encoded twice
  SECRET_DB_USERNAME: WVdSdGFXNEsK
  SECRET_DB_PASSWORD: Y0dGemMzZHZjbVFLCg==

First, make sure to create the Secret in your Kubernetes cluster:

kubectl apply -f secret.yaml

Then, you can reference this secret in your Helm Chart values.yaml as follows:

deployment:
  standalone:
    enabled: true
extraSecretEnvFrom:
  - name: db-creds

Redeploy your Helm Chart:

helm upgrade kestra kestra/kestra -f values.yaml

And test the secrets in a flow as described in the previous section.

Note that in this method, the Kubernetes Secret's keys must start with SECRET_ to be recognized as Kestra Secrets and they need to be base64 encoded twice due to the additional encoding used by Kubernetes Secrets.

Use Kubernetes Secrets as Kestra Secrets

An alternative to the extraSecretEnvFrom property is to create an environment variables referencing the Kubernetes Secret values. The benefit of this method is that you can use arbitrary keys in your Kubernetes Secret without the need to prefix them with SECRET_.

Kubernetes Secret definition (again, keep in mind that the Secret values still need to be base64 encoded twice to account for the additional encoding used by Kubernetes Secrets on top of the base64 encoding required by Kestra):

apiVersion: v1
kind: Secret
metadata:
  name: db-creds
type: Opaque
data: # base64 encoded twice
  username: WVdSdGFXNEsK
  password: Y0dGemMzZHZjbVFLCg==

Then, you can reference this secret in your Helm Chart values.yaml as follows:

deployment:
  standalone:
    enabled: true
extraEnv:
  - name: SECRET_DB_USERNAME
    valueFrom:
      secretKeyRef:
        name: db-creds
        key: username
  - name: SECRET_DB_PASSWORD
    valueFrom:
      secretKeyRef:
        name: db-creds
        key: password

The benefit of this approach is that you can define the Kestra-specific secret names in your Kestra's Helm Chart deployment rather than in the Kubernetes Secret itself.