# Gardener Fleet agent management

## Introduction
Gardener comes with an extension that enables shoot owners to register their cluster in Fleet.

## Extension Installation
The `shoot-fleet-agent` extension can be deployed and configured via Gardener's native resource [ControllerRegistration](https://github.com/gardener/gardener/blob/master/docs/extensions/controllerregistration.md).

### Prerequisites
To let the `shoot-fleet-agent` operate properly, you need to have:
- a working cluster with Fleet multicluster setup enabled
- have kubeconfig with read/write access to cluster.fleet.cattle.io and secret resrouces in some namespace

### ControllerRegistration
An example of a `ControllerRegistration` for the `shoot-fleet-agent` can be found here: https://github.com/ysoftdevs/gardener-extension-shoot-fleet-agent/blob/master/example/controller-registration.yaml

### Configuration
The `ControllerRegistration` contains a Helm chart which eventually deploy the `shoot-fleet-agent` to seed clusters. 

```yaml
apiVersion: core.gardener.cloud/v1beta1
kind: ControllerRegistration
...
  values:
    defaultConfig:
        kubeconfig: abcd
        labels:
```

If the `shoot-fleet-agent` should be enabled for every shoot cluster in your Gardener managed environment, you need to globally enable it in the `ControllerRegistration`:
```yaml
apiVersion: core.gardener.cloud/v1beta1
kind: ControllerRegistration
...
  resources:
  - globallyEnabled: true
    kind: Extension
    type: shoot-fleet-agent
```

Alternatively, you're given the option to only enable the service for certain shoots:
```yaml
kind: Shoot
apiVersion: core.gardener.cloud/v1beta1
...
spec:
  extensions:
  - type: shoot-fleet-agent
...
```

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