Merge pull request #18135 from bjornharrtell/hetzner-fix-cluster-autoscaler-addon

hetzner: add cluster-autoscaler addon for Hetzner cloud provider

Author: k8s-ci-robot

upup/models/cloudup/resources/addons/cluster-autoscaler.addons.k8s.io/k8s-1.15.yaml.template

@@ -374,6 +374,18 @@ spec:
           env:
             - name: AWS_REGION
               value: "{{ Region }}"
+          {{ else if (eq GetCloudProvider "hetzner") }}
+          env:
+            - name: HCLOUD_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: hcloud
+                  key: token
+            - name: HCLOUD_NETWORK
+              valueFrom:
+                secretKeyRef:
+                  name: hcloud
+                  key: network
           {{ end }}
           livenessProbe:
             failureThreshold: 3

upup/pkg/fi/cloudup/template_functions.go

@@ -989,6 +989,12 @@ func (tf *TemplateFunctions) GetClusterAutoscalerNodeGroups() map[string]Cluster
 				cloud := tf.cloud.(gce.GCECloud)
 				format := "https://www.googleapis.com/compute/v1/projects/%s/zones/%s/instanceGroups/%s"
 				group.Other = fmt.Sprintf(format, cloud.Project(), ig.Spec.Zones[0], gce.NameForInstanceGroupManager(cluster.ObjectMeta.Name, ig.ObjectMeta.Name, ig.Spec.Zones[0]))
+			} else if cluster.GetCloudProvider() == kops.CloudProviderHetzner {
+				// Hetzner autoscaler expects --nodes=min:max:instanceType:region:name.
+				// The subnet name for Hetzner is the location (e.g. "hel1"), which is
+				// also used as the region argument by the Hetzner cloud provider.
+				region := ig.Spec.Subnets[0]
+				group.Other = fmt.Sprintf("%s:%s:%s", ig.Spec.MachineType, region, ig.Name)
 			} else {
 				group.Other = ig.Name + "." + cluster.Name
 			}