1. Control Planetroll
ControlPlaneControl planes

Contract: ControlPlane resource Most Kubernetes clusters require a cloud-controller-manager or CSI drivers in order to work properly. Before introducing the ControlPlane extension resource Gardener was having several different Helm charts for the cloud-controller-manager deployments for the various providers. Now, Gardener commissions an external, provider-specific controller to take over this. One or More API Servers: Entry point for REST / kubectl. Etcd: Distributed key/value store. Controller-manager: Always evaluating current vs desired state.

  • A Highly Available control plane / etcd configuration, with an odd number of mixed role control plane / etcd nodes, commonly 3 or 5 The cluster is quorate, i.e. With 3 control plane / etcd nodes only a single node is unresponsive, or with 5 control plane / etcd nodes upto two nodes are unresponsive.
  • The -vsphere-controlplane-endpoint option sets a static virtual IP address for API requests to the cluster. Make sure that this IP address is not in the DHCP range, but is in the same subnet as the DHCP range. If you mapped a fully qualified domain name (FQDN) to the VIP address, you can specify the FQDN instead of the VIP address.
  • ControlPlane Thischapterincludesthefollowingsections:.ControlPlaneOverview,onpage1.ControlPlaneComponents,onpage2 Control PlaneOverview TheCiscoCRS.

controller-runtime offers envtest (godoc), a package that helps write integration tests for your controllers by setting up and starting an instance of etcd and the Kubernetes API server, without kubelet, controller-manager or other components.

Using envtest in integration tests follows the general flow of:

kubebuilder does the boilerplate setup and teardown of testEnv for you, in the ginkgo test suite that it generates under the /controllers directory.

Controlplane

Logs from the test runs are prefixed with test-env.

Configuring your test control plane

You can use environment variables and/or flags to specify the api-server and etcd setup within your integration tests.

Controlplaneauthpolicy

Environment Variables

Variable nameTypeWhen to use
USE_EXISTING_CLUSTERbooleanInstead of setting up a local control plane, point to the control plane of an existing cluster.
KUBEBUILDER_ASSETSpath to directoryPoint integration tests to a directory containing all binaries (api-server, etcd and kubectl).
TEST_ASSET_KUBE_APISERVER, TEST_ASSET_ETCD, TEST_ASSET_KUBECTLpaths to, respectively, api-server, etcd and kubectl binariesSimilar to KUBEBUILDER_ASSETS, but more granular. Point integration tests to use binaries other than the default ones. These environment variables can also be used to ensure specific tests run with expected versions of these binaries.
KUBEBUILDER_CONTROLPLANE_START_TIMEOUT and KUBEBUILDER_CONTROLPLANE_STOP_TIMEOUTdurations in format supported by time.ParseDurationSpecify timeouts different from the default for the test control plane to (respectively) start and stop; any test run that exceeds them will fail.
KUBEBUILDER_ATTACH_CONTROL_PLANE_OUTPUTbooleanSet to true to attach the control plane’s stdout and stderr to os.Stdout and os.Stderr. This can be useful when debugging test failures, as output will include output from the control plane.

Flags

Here’s an example of modifying the flags with which to start the API server in your integration tests, compared to the default values in envtest.DefaultKubeAPIServerFlags:

Testing considerations

Control plane protocols

Unless you’re using an existing cluster, keep in mind that no built-in controllers are running in the test context. In some ways, the test control plane will behave differently from “real” clusters, and that might have an impact on how you write tests. One common example is garbage collection; because there are no controllers monitoring built-in resources, objects do not get deleted, even if an OwnerReference is set up.

Control Planetroll

To test that the deletion lifecycle works, test the ownership instead of asserting on existence. For example:

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