flux2/docs/components/helm/controller.md

Helm Controller

The Helm Controller is a Kubernetes operator, allowing one to declaratively manage Helm chart releases with Kubernetes manifests.

The desired state of a Helm release is described through a Kubernetes Custom Resource named HelmRelease. Based on the creation, mutation or removal of a HelmRelease resource in the cluster, Helm actions are performed by the controller.

Features:

• Watches for HelmRelease objects and generates HelmChart objects
• Supports HelmChart artifacts produced from HelmRepository and GitRepository sources
• Fetches artifacts produced by source-controller from HelmChart objects
• Watches HelmChart objects for revision changes (including semver ranges for charts from HelmRepository sources)
• Performs automated Helm actions, including Helm tests, rollbacks and uninstalls
• Offers extensive configuration options for automated remediation (rollback, uninstall, retry) on failed Helm install, upgrade or test actions
• Runs Helm install/upgrade in a specific order, taking into account the depends-on relationship defined in a set of HelmRelease objects
• Prunes Helm releases removed from cluster (garbage collection)
• Reports Helm releases statuses (alerting provided by notification-controller)

Links:

• Source code fluxcd/helm-controller
• Specification docs