## Editing the Cluster Object

If you want to add labels and assign roles to your nodes, you must edit the Cluster object, and add the labels under `spec.topology.workers.metadata`:

```yaml
workers:
  machineDeployments:
    - class: workeramd64hcloud
      name: md-0
      replicas: 5
      failureDomain: nbg1
      metadata: // [!code ++]
        labels: // [!code ++]
          node-role.kubernetes.io/backend: 'true' // [!code ++]
          node.cluster.x-k8s.io/environment: 'production' // [!code ++]
      variables:
        overrides:
          - name: workerMachineTypeHcloud
            value: cpx42
          - name: workerMachinePlacementGroupNameHcloud
            value: md-0
```

## Label Propagation Criteria

For the label to propagate to the node in the workload cluster, it should meet one of the following criteria:

- Has node-role.kubernetes.io as prefix, e.g. `node-role.kubernetes.io/worker: ''`
- Belongs to node-restriction.kubernetes.io domain, e.g. `node-restriction.kubernetes.io/location: 'fsn1'`
- Belongs to node.cluster.x-k8s.io domain, e.g. `node.cluster.x-k8s.io/environment: 'production'`

## Machine Deployments Example

You can create new machine deployments and separate your node labels however you like. For example, you might have the same five machines, but three with label `node.cluster.x-k8s.io/environment: production` and two with `node.cluster.x-k8s.io/environment: staging`:

```yaml
workers:
  machineDeployments:
    - class: workeramd64hcloud
      name: md-0
      replicas: 5 // [!code --]
      replicas: 3 // [!code ++]
      failureDomain: nbg1
      metadata:
        labels:
          node-role.kubernetes.io/backend: 'true'
          node.cluster.x-k8s.io/environment: 'production'
      variables:
        overrides:
          - name: workerMachineTypeHcloud
            value: cpx42
          - name: workerMachinePlacementGroupNameHcloud
            value: md-0
    - class: workeramd64hcloud // [!code ++]
      name: md-1 // [!code ++]
      replicas: 2 // [!code ++]
      failureDomain: nbg1 // [!code ++]
      metadata: // [!code ++]
        labels: // [!code ++]
          node-role.kubernetes.io/backend: 'true' // [!code ++]
          node.cluster.x-k8s.io/environment: 'staging' // [!code ++]
      variables: // [!code ++]
        overrides: // [!code ++]
          - name: workerMachineTypeHcloud // [!code ++]
            value: cpx42 // [!code ++]
          - name: workerMachinePlacementGroupNameHcloud // [!code ++]
            value: md-0 // [!code ++]
```