Regarding support of DockerCluster for experimental and development purpose

[ajit3259]

Hi,

I was experimenting for development purpose using cluster API with Kamaji as control plane provider and Docker containers as Infra provider for worker nodes in Kind Cluster (as a management cluster).

I created the required CRDs and after applying them I was getting error in reconciler of the kamaji.

2025-11-06T12:20:50Z	ERROR	Reconciler error	{"controller": "kamajicontrolplane", "controllerGroup": "controlplane.cluster.x-k8s.io", "controllerKind": "KamajiControlPlane", "KamajiControlPlane": {"name":"tenant-cluster-04-control-plane","namespace":"default"}, "namespace": "default", "name": "tenant-cluster-04-control-plane", "reconcileID": "252c3356-e4a5-453a-8af4-f22134e02bc6", "error": "unsupported infrastructure provider", "errorVerbose": "unsupported infrastructure provider\ngithub.com/clastix/cluster-api-control-plane-provider-kamaji/controllers.(*KamajiControlPlaneReconciler).patchCluster\n\t/workspace/controllers/kamajicontrolplane_controller_cluster_patch.go:117\ngithub.com/clastix/cluster-api-control-plane-provider-kamaji/controllers.(*KamajiControlPlaneReconciler).Reconcile.func6\n\t/workspace/controllers/kamajicontrolplane_controller.go:218\ngithub.com/clastix/cluster-api-control-plane-provider-kamaji/controllers.TrackConditionType\n\t/workspace/controllers/conditions.go:26\ngithub.com/clastix/cluster-api-control-plane-provider-kamaji/controllers.(*KamajiControlPlaneReconciler).Reconcile\n\t/workspace/controllers/kamajicontrolplane_controller.go:217\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).Reconcile\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/internal/controller/controller.go:119\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).reconcileHandler\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/internal/controller/controller.go:340\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).processNextWorkItem\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/internal/controller/controller.go:300\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).Start.func2.1\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/internal/controller/controller.go:202\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_arm64.s:1223"}

Going through the code it is expected as docker cluster is not supported.

I want to know if there is plane to support it purely for experimental and development purpose.
Also I saw a PR which may be regarding the same and was closed? - #238

Thanks

[prometherion]

I have no idea why #238 has been closed.

However, with --dynamic-infrastructure-clusters and the DynamicInfrastructureClusterPatch Feature Gate you can patch the DockerCluster easily without requiring changes in the Kamaji CP Provider codebase.

However, I would suggest disabling the infrastructure cluster reconciliation using the cluster.x-k8s.io/managed-by annotation since Load Balancers wouldn't be required, as we're doing with KubeVirt.

[ajit3259]

Thanks will try the suggestions.