prune unused vars

single-host/variables.tf

@@ -7,10 +7,6 @@ variable "location" {
   default = "nbg1"
 }
 
-variable "instances" {
-  default = "1"
-}
-
 variable "server_type" {
   default = "cx11"
 }
@@ -18,11 +14,3 @@ variable "server_type" {
 variable "os_type" {
   default = "debian-11"
 }
-
-variable "disk_size" {
-  default = "20"
-}
-
-variable "ip_range" {
-  default = "10.0.1.0/24"
-}