feat: Add "num_suffix_format" variable for instance naming (#147)

README.md

@@ -124,6 +124,7 @@ No requirements.
 | monitoring | If true, the launched EC2 instance will have detailed monitoring enabled | `bool` | `false` | no |
 | name | Name to be used on all resources as prefix | `string` | n/a | yes |
 | network\_interface | Customize network interfaces to be attached at instance boot time | `list(map(string))` | `[]` | no |
+| num\_suffix\_format | Numerical suffix format used as the volume and EC2 instance name suffix | `string` | `"-%d"` | no |
 | placement\_group | The Placement Group to start the instance in | `string` | `""` | no |
 | private\_ip | Private IP address to associate with the instance in a VPC | `string` | `null` | no |
 | private\_ips | A list of private IP address to associate with the instance in a VPC. Should match the number of instances. | `list(string)` | `[]` | no |

main.tf

@@ -78,14 +78,14 @@ resource "aws_instance" "this" {
 
   tags = merge(
     {
-      "Name" = var.instance_count > 1 || var.use_num_suffix ? format("%s-%d", var.name, count.index + 1) : var.name
+      "Name" = var.instance_count > 1 || var.use_num_suffix ? format("%s${var.num_suffix_format}", var.name, count.index + 1) : var.name
     },
     var.tags,
   )
 
   volume_tags = merge(
     {
-      "Name" = var.instance_count > 1 || var.use_num_suffix ? format("%s-%d", var.name, count.index + 1) : var.name
+      "Name" = var.instance_count > 1 || var.use_num_suffix ? format("%s${var.num_suffix_format}", var.name, count.index + 1) : var.name
     },
     var.volume_tags,
   )

variables.tf

@@ -187,3 +187,10 @@ variable "use_num_suffix" {
   default     = false
 }
 
+variable "num_suffix_format" {
+  description = "Numerical suffix format used as the volume and EC2 instance name suffix"
+  type        = string
+  default     = "-%d"
+}
+
+