Added support for the list of private_ips (fixes #102) (#103)

examples/basic/main.tf

@@ -67,6 +67,7 @@ module "ec2" {
   ami                         = data.aws_ami.amazon_linux.id
   instance_type               = "c5.large"
   subnet_id                   = tolist(data.aws_subnet_ids.all.ids)[0]
+  private_ip                  = ["123.0.0.1", "123.0.0.2"]
   vpc_security_group_ids      = [module.security_group.this_security_group_id]
   associate_public_ip_address = true
   placement_group             = aws_placement_group.web.id

main.tf

@@ -24,7 +24,10 @@ resource "aws_instance" "this" {
   iam_instance_profile   = var.iam_instance_profile
 
   associate_public_ip_address = var.associate_public_ip_address
-  private_ip                  = var.private_ip
+  private_ip = element(
+    distinct(compact(concat([var.private_ip], var.private_ips))),
+    count.index,
+  )
   ipv6_address_count = var.ipv6_address_count
   ipv6_addresses     = var.ipv6_addresses
 
@@ -110,7 +113,10 @@ resource "aws_instance" "this_t2" {
   iam_instance_profile   = var.iam_instance_profile
 
   associate_public_ip_address = var.associate_public_ip_address
-  private_ip                  = var.private_ip
+  private_ip = element(
+    distinct(compact(concat([var.private_ip], var.private_ips))),
+    count.index,
+  )
   ipv6_address_count = var.ipv6_address_count
   ipv6_addresses     = var.ipv6_addresses
 

variables.tf

@@ -90,6 +90,12 @@ variable "private_ip" {
   default     = ""
 }
 
+variable "private_ips" {
+  description = "A list of private IP address to associate with the instance in a VPC. Should match the number of instances."
+  type        = list(string)
+  default     = []
+}
+
 variable "source_dest_check" {
   description = "Controls if traffic is routed to the instance when the destination address does not match the instance. Used for NAT or VPNs."
   type        = bool