improve support of single-node clusters

README.md

@@ -166,6 +166,21 @@ spec:
 
 </details>
 
+<details>
+
+<summary>single-node cluster</summary>
+
+Running a development cluster on a single node, without any high-availability is possible as well.
+In this case, we don't deploy an external load-balancer, but use [k3s service load balancer](https://rancher.com/docs/k3s/latest/en/networking/#service-load-balancer) on the host itself and open up port 80 & 443 in the firewall.
+
+``` terraform
+control_plane_count = 1
+allow_scheduling_on_control_plane = true
+agent_nodepools = {}
+```
+
+</details>
+
 ## Debugging
 
 First and foremost, it depends, but it's always good to have a quick look into Hetzner quickly without having to login to the UI. That is where the `hcloud` cli comes in.