Update main.tf

main.tf

+# creates public and private keypair
+resource "openstack_compute_keypair_v2" "test-keypair" {
+  name = "my-keypair"
+}
+
 # creates dmznet
 resource "openstack_networking_network_v2" "terraform" {
   name           = "dmznet"
@@ -74,7 +79,7 @@ resource "openstack_compute_instance_v2" "terraform" {
   name            = "terraform"
   image_name      = "${var.image}"
   flavor_name     = "${var.flavor}"
-  key_pair        = "${var.key_pair}"
+  key_pair        = "${openstack_compute_keypair_v2.test-keypair.name}"
   security_groups = ["${openstack_networking_secgroup_v2.terraform.name}"]
 
 # defines the instance id using info from datasources.tf