Add node_labels variable in workers modules to set initial node labels (#550)

* Also add `worker_node_labels` variable in `kubernetes` modules to set
initial node labels for the default workers

aws/container-linux/kubernetes/workers/cl/worker.yaml.tmpl

@@ -61,6 +61,9 @@ systemd:
           --lock-file=/var/run/lock/kubelet.lock \
           --network-plugin=cni \
           --node-labels=node.kubernetes.io/node \
+          %{ for label in split(",", node_labels) }
+          --node-labels=${label} \
+          %{ endfor ~}
           --pod-manifest-path=/etc/kubernetes/manifests \
           --read-only-port=0 \
           --volume-plugin-dir=/var/lib/kubelet/volumeplugins

aws/container-linux/kubernetes/workers/variables.tf

@@ -105,3 +105,8 @@ variable "cluster_domain_suffix" {
   default = "cluster.local"
 }
 
+variable "node_labels" {
+  description = "List of additional labels to add to worker nodes"
+  type = list
+  default = []
+}

aws/container-linux/kubernetes/workers/workers.tf

@@ -86,6 +86,7 @@ data "template_file" "worker-config" {
     cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
     cluster_domain_suffix  = var.cluster_domain_suffix
     cgroup_driver          = local.flavor == "flatcar" && local.channel == "edge" ? "systemd" : "cgroupfs"
+    node_labels            = join(",", var.node_labels)
   }
 }