main for ohpc instance creation

ohpc-instance/main.tf

+variable "ohpc_instance_name" {default = "ohpc"}
+variable "image_ohpc" {default = "CentOS-7-x86_64-GenericCloud-1905"}
+variable "flavor" {default = "m1.medium"}
+variable "keypair_name" {default = "os-gen-keypair"}
+variable "internal_net" {default = "clusternet"}
+variable "external_net" {default = "dmznet"}
+variable "floating_ip_ohpc" {type = string}
+variable "host_prefix" {default = "164.111.161.%s"}
+variable "ohpc_user" {default = "centos"}
+variable "ssh_private_key" {default = "~/.ssh/id_rsa"}
+
+# creates details for the OHPC instance
+resource "openstack_compute_instance_v2" "ohpc" {
+  depends_on      = [var.external_subnet_id]
+  name            = var.ohpc_instance_name
+  image_name      = var.image_ohpc
+  flavor_name     = var.flavor
+  key_pair        = openstack_compute_keypair_v2.keypair.name
+  security_groups = ["default"]
+
+# defines the networks of the instance
+  network {
+    name = var.external_net
+  }
+  network {
+    name = var.internal_net
+  }
+}
+
+# associates floating ip with the OHPC instance
+resource "openstack_compute_floatingip_associate_v2" "ohpc" {
+  floating_ip = var.floating_ip_ohpc
+  instance_id = openstack_compute_instance_v2.ohpc.id
+
+# defines ssh connection
+  connection {
+    host = format(var.host_prefix,element(split(".", var.floating_ip_ohpc),3,),)
+    user        = var.ohpc_user
+    private_key = file(var.ssh_private_key)
+  }
+}
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