Helm Service

This service has reached end of life on December 22nd, 2023 similar to Keptn V1.

Before you start

Please consider using job-executor-service and get full control of your deployment commands. You can find more details here.

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The helm-service allows deploying services to a Kubernetes cluster and releasing them to user traffic. Therefore, these services have to be packed as Helm charts. For details about the Helm chart and how to onboard a service, please checkout the docs.

In order to deploy and release services to user-traffic, the helm-service implements two tasks:

1. Deployment task: Here, the helm-service executes a Helm upgrade on the Helm chart provided by the user. Furthermore, the helm-service routes traffic to this new version.
2. Release task: Here, the helm-service either promotes or rolls back the new version depending on the (evaluation) result.

Compatibility Matrix

Keptn Version	Helm-service Docker Image
0.17.0 and older	Please use https://github.com/keptn/keptn/releases
0.18.0	keptn-contrib/helm-service:0.18.1
0.19.x	keptn-contrib/helm-service:0.18.1
0.20.x	keptn-contrib/helm-service:0.18.1
1.x.y	keptn-contrib/helm-service:0.18.1

Newer Keptn versions might be compatible, but compatibility has not been verified at the time of the release.

Installation

The helm-service is part of the Execution Plane for Continuous Delivery.

To install it next to your Keptn installation, you can use the following command:

HELM_SERVICE_VERSION=0.18.1 # https://github.com/keptn-contrib/helm-service/releases
helm install helm-service https://github.com/keptn-contrib/helm-service/releases/download/$HELM_SERVICE_VERSION/helm-service-$HELM_SERVICE_VERSION.tgz -n keptn

Uninstall

You can uninstall it directly using helm, e.g.:

helm uninstall helm-service -n keptn

Installation on multiple remote execution planes

To avoid naming conflicts and resulting errors in a setup with multiple remote execution planes, please provide a unique name per helm-service using the nameOverride parameter that can be found in the helm values.

Development

You can use skaffold run --tail to build and deploy from this directory.

Handled events

The helm-service handles a set of events. The following sequence diagrams describe the respectively executed actions and the involved components.

Handling of sh.keptn.event.service.delete.finished events

The sh.keptn.event.service.delete.finished event states that a Keptn service has been deleted by the shipyard-controller. In case this service was deployed by the helm-service, the helm-service uninstalls all releases of this Keptn service.

Handling of sh.keptn.event.deployment.triggered events

The sh.keptn.event.deployment.triggered event states that a new deployment has been triggered e.g. by the user. The helm-service executes a Helm upgrade on the Helm chart provided by the user, i.e. the user-chart and routes traffic to this new version.

Handling of sh.keptn.event.release.triggered events

The sh.keptn.event.release.triggered event states that a release has been triggered.

For a direct deployment, the helm-service does not have to apply anything.

For a b/g deployment with an (evaluation) result equals pass or warning, the helm-service promotes the new version to be stable.

For a b/g deployment with an (evaluation) result equals fail, the helm-service rolls back the new version.

Handling of sh.keptn.event.action.triggered events

The sh.keptn.event.action.triggered event stats that a remediation action has been triggered. The helm-service provides a replica scaling remediation action.

LICENSE

See LICENSE.