Ignore node IPs in Terraform output

We wanted to group all IP addresses under a single output variable, so
that one could `terraform output ips` to get a clear view of what was
spawned (and so we could generate a SSH config file for accessing any of
the spawned VMs by name).

However, the "splat" syntax we wanted to use is not supported in
Terraform <= 0.11, so we just ignore the nodes (other than bootstrap and
router) for now.

For reference: hashicorp/terraform#17048

Issue: GH-889

eve/workers/openstack-multiple-nodes/terraform/generate-ssh-config.sh

@@ -60,6 +60,7 @@ EOF
 print_host_config router "$(get_ip router)" > "$SSH_CONFIG_FILE"
 print_host_config bootstrap "$(get_ip bootstrap)" >> "$SSH_CONFIG_FILE"
 
-for idx in `seq 1 $NODES_COUNT`; do
-    print_host_config "node$idx" "$(get_ip nodes "$(expr $idx - 1)")" >> "$SSH_CONFIG_FILE"
-done
+# FIXME: this needs Terraform v0.12 to work (see ./nodes.tf)
+# for idx in `seq 1 $NODES_COUNT`; do
+#     print_host_config "node$idx" "$(get_ip nodes "$(expr $idx - 1)")" >> "$SSH_CONFIG_FILE"
+# done

eve/workers/openstack-multiple-nodes/terraform/nodes.tf

@@ -102,7 +102,7 @@ resource "openstack_compute_instance_v2" "nodes" {
     "${local.workload_plane_network}",
   ]
 
-    # We need the subnets to be created before attempting to reach the DHCP server
+  # We need the subnets to be created before attempting to reach the DHCP server
   depends_on = [
     "openstack_networking_subnet_v2.control_plane_subnet",
     "openstack_networking_subnet_v2.workload_plane_subnet",
@@ -129,6 +129,9 @@ output "ips" {
   value = {
     bootstrap = "${openstack_compute_instance_v2.bootstrap.network.0.fixed_ip_v4}"
     router = "${openstack_compute_instance_v2.router.network.0.fixed_ip_v4}"
-    nodes = ["${openstack_compute_instance_v2.nodes.*.network.0.fixed_ip_v4}"]
+
+    # FIXME: this syntax does not work (but will in v0.12)
+    # see https://github.com/hashicorp/terraform/issues/17048
+    # nodes = ["${openstack_compute_instance_v2.nodes.*.network.0.fixed_ip_v4}"]
   }
 }