Configure the MetalLB speaker node selector¶

By default, MetalLB speakers are deployed on all Kubernetes nodes except master nodes. You can configure MetalLB to run its speakers on a particular set of nodes. This decreases the number of nodes that should be connected to external network. In this scenario, only a few nodes are exposed for ingress traffic from the outside world.

To customize the MetalLB speaker node selector:

Using kubeconfig of the Container Cloud management cluster, open the MOSK Cluster object for editing:

kubectl --kubeconfig <pathToManagementClusterKubeconfig> -n <OSClusterNamespace> edit cluster <OSClusterName>

In the spec:providerSpec:value:helmReleases section, add the speaker.nodeSelector field for metallb:
```
spec:
  ...
  providerSpec:
    value:
      ...
      helmReleases:
      - name: metallb
        values:
          ...
          speaker:
            nodeSelector:
              metallbSpeakerEnabled: "true"
```
The metallbSpeakerEnabled: "true" parameter in this example is the label on Kubernetes nodes where MetalLB speakers will be deployed. It can be an already existing node label or a new one.

Note

The issue [24435] MetalLB speaker fails to announce the LB IP for the Ingress service, which is related to collocation of MetalLB speakers and the OpenStack Ingress service pods is addressed in MOSK 22.5. For details, see Release Notes: Set externalTrafficPolicy=Local for the OpenStack Ingress service.

You can add user-defined labels to nodes using the nodeLabels field.

This field contains the list of node labels to be attached to a node for the user to run certain components on separate cluster nodes. The list of allowed node labels is located in the Cluster object status providerStatus.releaseRef.current.allowedNodeLabels field.

If the value field is not defined in allowedNodeLabels, a label can have any value. For example:
```
allowedNodeLabels:
- displayName: Stacklight
  key: stacklight
```
Before or after a machine deployment, add the required label from the allowed node labels list with the corresponding value to spec.providerSpec.value.nodeLabels in machine.yaml. For example:
```
nodeLabels:
- key: stacklight
  value: enabled
```
Adding of a node label that is not available in the list of allowed node labels is restricted.