fix: Assignment of the Capacity Reservation id to an instance (#282)

Co-authored-by: Samuel CHNIBER <schniber@amazon.fr>

Author: schniber

examples/complete/README.md

@@ -32,22 +32,24 @@ Note that this example may create resources which can cost money. Run `terraform
 
 | Name | Source | Version |
 |------|--------|---------|
-| <a name="module_ec2_capacity_reservation"></a> [ec2\_capacity\_reservation](#module\_ec2\_capacity\_reservation) | ../../ | n/a |
 | <a name="module_ec2_complete"></a> [ec2\_complete](#module\_ec2\_complete) | ../../ | n/a |
 | <a name="module_ec2_disabled"></a> [ec2\_disabled](#module\_ec2\_disabled) | ../../ | n/a |
 | <a name="module_ec2_metadata_options"></a> [ec2\_metadata\_options](#module\_ec2\_metadata\_options) | ../../ | n/a |
 | <a name="module_ec2_multiple"></a> [ec2\_multiple](#module\_ec2\_multiple) | ../../ | n/a |
 | <a name="module_ec2_network_interface"></a> [ec2\_network\_interface](#module\_ec2\_network\_interface) | ../../ | n/a |
+| <a name="module_ec2_open_capacity_reservation"></a> [ec2\_open\_capacity\_reservation](#module\_ec2\_open\_capacity\_reservation) | ../../ | n/a |
 | <a name="module_ec2_spot_instance"></a> [ec2\_spot\_instance](#module\_ec2\_spot\_instance) | ../../ | n/a |
 | <a name="module_ec2_t2_unlimited"></a> [ec2\_t2\_unlimited](#module\_ec2\_t2\_unlimited) | ../../ | n/a |
 | <a name="module_ec2_t3_unlimited"></a> [ec2\_t3\_unlimited](#module\_ec2\_t3\_unlimited) | ../../ | n/a |
+| <a name="module_ec2_targeted_capacity_reservation"></a> [ec2\_targeted\_capacity\_reservation](#module\_ec2\_targeted\_capacity\_reservation) | ../../ | n/a |
 | <a name="module_security_group"></a> [security\_group](#module\_security\_group) | terraform-aws-modules/security-group/aws | ~> 4.0 |
 | <a name="module_vpc"></a> [vpc](#module\_vpc) | terraform-aws-modules/vpc/aws | ~> 3.0 |
 
 ## Resources
 
 | Name | Type |
 |------|------|
+| [aws_ec2_capacity_reservation.open](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ec2_capacity_reservation) | resource |
 | [aws_ec2_capacity_reservation.targeted](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ec2_capacity_reservation) | resource |
 | [aws_kms_key.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/kms_key) | resource |
 | [aws_network_interface.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/network_interface) | resource |

examples/complete/main.tf

@@ -73,6 +73,14 @@ resource "aws_network_interface" "this" {
   subnet_id = element(module.vpc.private_subnets, 0)
 }
 
+resource "aws_ec2_capacity_reservation" "open" {
+  instance_type           = "t3.micro"
+  instance_platform       = "Linux/UNIX"
+  availability_zone       = "${local.region}a"
+  instance_count          = 1
+  instance_match_criteria = "open"
+}
+
 resource "aws_ec2_capacity_reservation" "targeted" {
   instance_type           = "t3.micro"
   instance_platform       = "Linux/UNIX"
@@ -81,9 +89,9 @@ resource "aws_ec2_capacity_reservation" "targeted" {
   instance_match_criteria = "targeted"
 }
 
-# ################################################################################
-# # EC2 Module
-# ################################################################################
+# # ################################################################################
+# # # EC2 Module
+# # ################################################################################
 
 module "ec2_disabled" {
   source = "../../"
@@ -341,16 +349,36 @@ module "ec2_spot_instance" {
 # EC2 Module - Capacity Reservation
 ################################################################################
 
-module "ec2_capacity_reservation" {
+module "ec2_open_capacity_reservation" {
   source = "../../"
 
-  name = "${local.name}-capacity-reservation"
+  name = "${local.name}-open-capacity-reservation"
 
   ami                         = data.aws_ami.amazon_linux.id
   instance_type               = "t3.micro"
   subnet_id                   = element(module.vpc.private_subnets, 0)
   vpc_security_group_ids      = [module.security_group.security_group_id]
-  associate_public_ip_address = true
+  associate_public_ip_address = false
+
+  capacity_reservation_specification = {
+    capacity_reservation_target = {
+      capacity_reservation_id = aws_ec2_capacity_reservation.open.id
+    }
+  }
+
+  tags = local.tags
+}
+
+module "ec2_targeted_capacity_reservation" {
+  source = "../../"
+
+  name = "${local.name}-targeted-capacity-reservation"
+
+  ami                         = data.aws_ami.amazon_linux.id
+  instance_type               = "t3.micro"
+  subnet_id                   = element(module.vpc.private_subnets, 0)
+  vpc_security_group_ids      = [module.security_group.security_group_id]
+  associate_public_ip_address = false
 
   capacity_reservation_specification = {
     capacity_reservation_target = {

main.tf

@@ -42,7 +42,7 @@ resource "aws_instance" "this" {
       dynamic "capacity_reservation_target" {
         for_each = lookup(capacity_reservation_specification.value, "capacity_reservation_target", [])
         content {
-          capacity_reservation_id = lookup(capacity_reservation_target, "capacity_reservation_id", null)
+          capacity_reservation_id = lookup(capacity_reservation_specification.value.capacity_reservation_target, "capacity_reservation_id", null)
         }
       }
     }
@@ -182,14 +182,15 @@ resource "aws_spot_instance_request" "this" {
   # End spot request specific attributes
 
   dynamic "capacity_reservation_specification" {
-    for_each = var.capacity_reservation_specification != null ? [var.capacity_reservation_specification] : []
+    for_each = length(var.capacity_reservation_specification) > 0 ? [var.capacity_reservation_specification] : []
     content {
-      capacity_reservation_preference = lookup(capacity_reservation_specification.value, "capacity_reservation_preference", null)
+      capacity_reservation_preference = try(capacity_reservation_specification.value.capacity_reservation_preference, null)
 
       dynamic "capacity_reservation_target" {
-        for_each = lookup(capacity_reservation_specification.value, "capacity_reservation_target", [])
+        for_each = try([capacity_reservation_specification.value.capacity_reservation_target], [])
         content {
-          capacity_reservation_id = lookup(capacity_reservation_target.value, "capacity_reservation_id", null)
+          capacity_reservation_id                 = try(capacity_reservation_target.value.capacity_reservation_id, null)
+          capacity_reservation_resource_group_arn = try(capacity_reservation_target.value.capacity_reservation_resource_group_arn, null)
         }
       }
     }