The helm-controller is a Kubernetes operator, allowing one to declaratively manage Helm chart releases. It is part of a composable GitOps toolkit and depends on source-controller to acquire the Helm charts from Helm repositories.
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
operator.
- Watches for
HelmReleaseobjects and generatesHelmChartobjects - Supports
HelmChartartifacts produced fromHelmRepository,GitRepositoryandBucketsources - Fetches artifacts produced by source-controller from
HelmChartobjects - Watches
HelmChartobjects for revision changes (including semver ranges for charts fromHelmRepositorysources) - 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
HelmReleaseobjects - Reports Helm release statuses (alerting provided by notification-controller)
- Built-in Kustomize compatible Helm post renderer, providing support for strategic merge, JSON 6902 and images patches
- Supports detecting and correcting in-cluster changes compared to the desired state of the Helm release