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It's a label. If you set one of these labels:

<http://node-role.harvesterhci.io/witness=true|node-role.harvesterhci.io/witness=true>
<http://node-role.harvesterhci.io/management=true|node-role.harvesterhci.io/management=true>
<http://node-role.harvesterhci.io/worker=true|node-role.harvesterhci.io/worker=true>

...the node will have that role (i.e., witness, management or worker). If none of those labels are set, it means the node has the default role. A couple of notes: • You'll probably want to use the command line (e.g.

kubectl label node/NODENAME <http://node-role.harvesterhci.io/management=true|node-role.harvesterhci.io/management=true>

to set a label,

kubectl label node/NODENAME <http://node-role.harvesterhci.io/management-|node-role.harvesterhci.io/management->

to remove it, or

kubectl edit node/NODENAME

) rather than the Harvester GUI, because those labels are filtered out of the node config editor. • The roles only determine how/whether nodes are promoted to management. i.e. if you have an existing node that's already a control-plane node, setting the worker role won't cause that node to be demoted.