From the cluster-specific page, click on Nodes along the top of the cluster display. This displays the nodes that constitute the cluster. This is also the default page that appears when you click on the cluster name beneath Manage Clusters from the menu on the left side of the luci Homebase page.

Select the node to reboot by clicking the checkbox for that node.

Select the Reboot function from the menu at the top of the page. This causes the selected node to reboot and a message appears at the top of the page indicating that the node is being rebooted.

Refresh the page to see the updated status of the node.