Configure the MetalLB speaker node selector¶

By default, MetalLB speakers are deployed on all Kubernetes nodes except master nodes. You can decrease the number of MetalLB speakers or run them on a particular set of nodes.

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:
           configInline:
             ...
           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

Due to the issue with collocation of MetalLB speaker and the OpenStack Ingress service Pods, the use of the MetalLB speaker node selector is limited. For details, see [24435] MetalLB speaker fails to announce the LB IP for the 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.

Starting from MOSK 22.3, 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.