generate key, use variables

main.tf

@@ -1,3 +1,5 @@
+
+
 resource "aws_vpc" "sgtm_vpc" {
   cidr_block           = "10.123.0.0/16"
   enable_dns_hostnames = true
@@ -66,9 +68,20 @@ resource "aws_security_group" "sgtm_sg" {
   }
 }
 
+resource "tls_private_key" "key" {
+  algorithm   = var.tls_key_algorithm
+}
+
 resource "aws_key_pair" "sgtm_auth" {
-    key_name = "sgtmkey"
-    public_key = file("~/.ssh/sgtmkey.pub")
+  key_name   = "${var.name_prefix}-key-${var.name_suffix}"
+  public_key = tls_private_key.key.public_key_openssh
+
+  provisioner "local-exec" {
+    command = <<EOF
+      echo "${tls_private_key.key.private_key_pem}" > key.pem
+      chmod 0600 key.pem
+EOF
+  }
 }
 
 resource "aws_instance" "dev_node" {