[contrib/terraform/openstack] Add supplementary node groups

* Add supplementary node groups

  To add additional ansible groups to the k8s nodes, such as
  `kube-ingress` for running ingress controller pods. Empty by default.

contrib/terraform/openstack/README.md

@@ -219,6 +219,7 @@ For your cluster, edit `inventory/$CLUSTER/cluster.tf`.
 |`number_of_gfs_nodes_no_floating_ip` | Number of gluster servers to provision. |
 | `gfs_volume_size_in_gb` | Size of the non-ephemeral volumes to be attached to store the GlusterFS bricks |
 |`supplementary_master_groups` | To add ansible groups to the masters, such as `kube-node` for tainting them as nodes, empty by default. |
+|`supplementary_node_groups` | To add ansible groups to the nodes, such as `kube-ingress` for running ingress controller pods, empty by default. |
 
 #### Terraform state files
 

contrib/terraform/openstack/kubespray.tf

@@ -49,6 +49,7 @@ module "compute" {
   k8s_node_fips                                = "${module.ips.k8s_node_fips}"
   bastion_fips                                 = "${module.ips.bastion_fips}"
   supplementary_master_groups                  = "${var.supplementary_master_groups}"
+  supplementary_node_groups                    = "${var.supplementary_node_groups}"
 
   network_id = "${module.network.router_id}"
 }

contrib/terraform/openstack/modules/compute/main.tf

@@ -231,7 +231,7 @@ resource "openstack_compute_instance_v2" "k8s_node" {
 
   metadata = {
     ssh_user         = "${var.ssh_user}"
-    kubespray_groups = "kube-node,k8s-cluster"
+    kubespray_groups = "kube-node,k8s-cluster,${var.supplementary_node_groups}"
     depends_on       = "${var.network_id}"
   }
 
@@ -258,7 +258,7 @@ resource "openstack_compute_instance_v2" "k8s_node_no_floating_ip" {
 
   metadata = {
     ssh_user         = "${var.ssh_user}"
-    kubespray_groups = "kube-node,k8s-cluster,no-floating"
+    kubespray_groups = "kube-node,k8s-cluster,no-floating,${var.supplementary_node_groups}"
     depends_on       = "${var.network_id}"
   }
 

contrib/terraform/openstack/modules/compute/variables.tf

@@ -59,3 +59,7 @@ variable "bastion_fips" {
 variable "supplementary_master_groups" {
   default = ""
 }
+
+variable "supplementary_node_groups" {
+  default = ""
+}

contrib/terraform/openstack/variables.tf

@@ -116,3 +116,8 @@ variable "supplementary_master_groups" {
   description = "supplementary kubespray ansible groups for masters, such kube-node"
   default = ""
 }
+
+variable "supplementary_node_groups" {
+  description = "supplementary kubespray ansible groups for worker nodes, such as kube-ingress"
+  default = ""
+}