Configuring the Calico Cloud Kubernetes controllers
The Calico Cloud Kubernetes controllers are deployed in a Kubernetes cluster. The different controllers monitor the Kubernetes API and perform actions based on cluster state.
- Operator
- Manifest
If you have installed Calico using the operator, see the KubeControllersConfiguration resource instead.
The controllers are primarily configured through environment variables. When running
the controllers as a Kubernetes pod, this is accomplished through the pod manifest env
section.
The tigera/kube-controllers container​
The tigera/kube-controllers container includes the following controllers:
- node controller: watches for the removal of Kubernetes nodes and removes corresponding data from Calico Cloud, and optionally watches for node updates to create and sync host endpoints for each node.
- federation controller: watches Kubernetes services and endpoints locally and across all remote clusters, and programs Kubernetes endpoints for any locally configured service that specifies a service federation selector annotation.
Configuring datastore access​
The datastore type can be configured via the DATASTORE_TYPE environment variable. Only supported value is kubernetes.
kubernetes​
When running the controllers as a Kubernetes pod, Kubernetes API access is configured automatically and no additional configuration is required. However, the controllers can also be configured to use an explicit kubeconfig file override to configure API access if needed.
| Environment | Description | Schema |
|---|---|---|
KUBECONFIG | Path to a Kubernetes kubeconfig file mounted within the container. | path |
Other configuration​
Whenever possible, prefer configuring the kube-controllers component using the KubeControllersConfiguration API resource, Some configuration options may not be available through environment variables.
The following environment variables can be used to configure the Calico Cloud Kubernetes controllers.
| Environment | Description | Schema | Default |
|---|---|---|---|
DATASTORE_TYPE | Which datastore type to use | etcdv3, kubernetes | kubernetes |
ENABLED_CONTROLLERS | Which controllers to run | namespace, node, policy, serviceaccount, workloadendpoint | policy,namespace,serviceaccount,workloadendpoint,node |
LOG_LEVEL | Minimum log level to be displayed. | debug, info, warning, error | info |
KUBECONFIG | Path to a kubeconfig file for Kubernetes API access | path | |
SYNC_NODE_LABELS | When enabled, Kubernetes node labels will be copied to Calico node objects. | boolean | true |
AUTO_HOST_ENDPOINTS | When set to enabled, automatically create a host endpoint for each node. | enabled, disabled | disabled |
About each controller​
Node controller​
The node controller has several functions.
- Garbage collects IP addresses.
- Automatically provisions host endpoints for Kubernetes nodes.
Federation controller​
The federation controller syncs Kubernetes federated endpoint changes to the Calico Cloud datastore.
The controller must have read access to the Kubernetes API to monitor Service and Endpoints events, and must
also have write access to update Endpoints.
The federation controller is disabled by default if ENABLED_CONTROLLERS is not explicitly specified.
This controller is valid for all Calico Cloud datastore types. For more details refer to the Configuring federated services usage guide.