Helm Controller

Helm Controller handles management and MOSK clusters core addons, such as StackLight, and the application addons, such as the OpenStack components.

Helm Controller is installed as a separate Helm v3 chart by the provider. Its Pods are created using Deployment.

The Helm release information is stored in the KaaSRelease object for the management clusters and in the ClusterRelease object for management and MOSK clusters. These objects are used by the provider that uses the information from the ClusterRelease object together with the management API Cluster spec. In Cluster spec, the operator can specify the Helm release name and charts to use. By combining the information from the providerSpec parameter of the Cluster object and its ClusterRelease object, the cluster actuator generates LCMCluster objects. These objects are further handled by LCM Controller, and the HelmBundle object is handled by Helm Controller. HelmBundle must have the same name as the LCMCluster object for the cluster that HelmBundle applies to.

Although a cluster actuator can only create a single HelmBundle per cluster, Helm Controller can handle multiple HelmBundle objects per cluster.

Helm Controller handles HelmBundle objects and reconciles them with the state of Helm in its cluster.

Helm Controller can also be used by the management cluster with corresponding HelmBundle objects created as part of the initial management cluster setup.