feature/disable-alarm-action

README.md

@@ -257,6 +257,7 @@ Available targets:
 | <a name="input_delete_on_termination"></a> [delete\_on\_termination](#input\_delete\_on\_termination) | Whether the volume should be destroyed on instance termination | `bool` | `true` | no |
 | <a name="input_delimiter"></a> [delimiter](#input\_delimiter) | Delimiter to be used between ID elements.<br>Defaults to `-` (hyphen). Set to `""` to use no delimiter at all. | `string` | `null` | no |
 | <a name="input_descriptor_formats"></a> [descriptor\_formats](#input\_descriptor\_formats) | Describe additional descriptors to be output in the `descriptors` output map.<br>Map of maps. Keys are names of descriptors. Values are maps of the form<br>`{<br>   format = string<br>   labels = list(string)<br>}`<br>(Type is `any` so the map values can later be enhanced to provide additional options.)<br>`format` is a Terraform format string to be passed to the `format()` function.<br>`labels` is a list of labels, in order, to pass to `format()` function.<br>Label values will be normalized before being passed to `format()` so they will be<br>identical to how they appear in `id`.<br>Default is `{}` (`descriptors` output will be empty). | `any` | `{}` | no |
+| <a name="input_disable_alarm_action"></a> [disable\_alarm\_action](#input\_disable\_alarm\_action) | Disable the creation of Alarm Action | `bool` | `false` | no |
 | <a name="input_disable_api_termination"></a> [disable\_api\_termination](#input\_disable\_api\_termination) | Enable EC2 Instance Termination Protection | `bool` | `false` | no |
 | <a name="input_ebs_device_name"></a> [ebs\_device\_name](#input\_ebs\_device\_name) | Name of the EBS device to mount | `list(string)` | <pre>[<br>  "/dev/xvdb",<br>  "/dev/xvdc",<br>  "/dev/xvdd",<br>  "/dev/xvde",<br>  "/dev/xvdf",<br>  "/dev/xvdg",<br>  "/dev/xvdh",<br>  "/dev/xvdi",<br>  "/dev/xvdj",<br>  "/dev/xvdk",<br>  "/dev/xvdl",<br>  "/dev/xvdm",<br>  "/dev/xvdn",<br>  "/dev/xvdo",<br>  "/dev/xvdp",<br>  "/dev/xvdq",<br>  "/dev/xvdr",<br>  "/dev/xvds",<br>  "/dev/xvdt",<br>  "/dev/xvdu",<br>  "/dev/xvdv",<br>  "/dev/xvdw",<br>  "/dev/xvdx",<br>  "/dev/xvdy",<br>  "/dev/xvdz"<br>]</pre> | no |
 | <a name="input_ebs_iops"></a> [ebs\_iops](#input\_ebs\_iops) | Amount of provisioned IOPS. This must be set with a volume\_type of `io1`, `io2` or `gp3` | `number` | `0` | no |

cloudwatch-alarm.tf

@@ -1,15 +1,16 @@
 # Restart dead or hung instance
 
 resource "null_resource" "check_alarm_action" {
-  count = local.instance_count
+  count = var.disable_alarm_action ? 0 : local.instance_count
 
   triggers = {
     action = "arn:${data.aws_partition.default.partition}:swf:${local.region}:${data.aws_caller_identity.default.account_id}:${var.default_alarm_action}"
   }
 }
 
 resource "aws_cloudwatch_metric_alarm" "default" {
-  count               = local.instance_count
+  count = var.disable_alarm_action ? 0 : local.instance_count
+
   alarm_name          = module.this.id
   comparison_operator = var.comparison_operator
   evaluation_periods  = var.evaluation_periods

docs/terraform.md

@@ -70,6 +70,7 @@
 | <a name="input_delete_on_termination"></a> [delete\_on\_termination](#input\_delete\_on\_termination) | Whether the volume should be destroyed on instance termination | `bool` | `true` | no |
 | <a name="input_delimiter"></a> [delimiter](#input\_delimiter) | Delimiter to be used between ID elements.<br>Defaults to `-` (hyphen). Set to `""` to use no delimiter at all. | `string` | `null` | no |
 | <a name="input_descriptor_formats"></a> [descriptor\_formats](#input\_descriptor\_formats) | Describe additional descriptors to be output in the `descriptors` output map.<br>Map of maps. Keys are names of descriptors. Values are maps of the form<br>`{<br>   format = string<br>   labels = list(string)<br>}`<br>(Type is `any` so the map values can later be enhanced to provide additional options.)<br>`format` is a Terraform format string to be passed to the `format()` function.<br>`labels` is a list of labels, in order, to pass to `format()` function.<br>Label values will be normalized before being passed to `format()` so they will be<br>identical to how they appear in `id`.<br>Default is `{}` (`descriptors` output will be empty). | `any` | `{}` | no |
+| <a name="input_disable_alarm_action"></a> [disable\_alarm\_action](#input\_disable\_alarm\_action) | Disable the creation of Alarm Action | `bool` | `false` | no |
 | <a name="input_disable_api_termination"></a> [disable\_api\_termination](#input\_disable\_api\_termination) | Enable EC2 Instance Termination Protection | `bool` | `false` | no |
 | <a name="input_ebs_device_name"></a> [ebs\_device\_name](#input\_ebs\_device\_name) | Name of the EBS device to mount | `list(string)` | <pre>[<br>  "/dev/xvdb",<br>  "/dev/xvdc",<br>  "/dev/xvdd",<br>  "/dev/xvde",<br>  "/dev/xvdf",<br>  "/dev/xvdg",<br>  "/dev/xvdh",<br>  "/dev/xvdi",<br>  "/dev/xvdj",<br>  "/dev/xvdk",<br>  "/dev/xvdl",<br>  "/dev/xvdm",<br>  "/dev/xvdn",<br>  "/dev/xvdo",<br>  "/dev/xvdp",<br>  "/dev/xvdq",<br>  "/dev/xvdr",<br>  "/dev/xvds",<br>  "/dev/xvdt",<br>  "/dev/xvdu",<br>  "/dev/xvdv",<br>  "/dev/xvdw",<br>  "/dev/xvdx",<br>  "/dev/xvdy",<br>  "/dev/xvdz"<br>]</pre> | no |
 | <a name="input_ebs_iops"></a> [ebs\_iops](#input\_ebs\_iops) | Amount of provisioned IOPS. This must be set with a volume\_type of `io1`, `io2` or `gp3` | `number` | `0` | no |

main.tf

@@ -163,6 +163,12 @@ resource "aws_instance" "default" {
     cpu_credits = var.burstable_mode
   }
 
+  lifecycle {
+    ignore_changes = [
+      ami
+    ]
+  }
+
   tags = module.this.tags
 
   volume_tags = var.volume_tags_enabled ? module.this.tags : {}

variables.tf

@@ -279,6 +279,12 @@ variable "metric_threshold" {
   default     = 1
 }
 
+variable "disable_alarm_action" {
+  type        = bool
+  default     = false
+  description = "Disable the creation of Alarm Action"
+}
+
 variable "default_alarm_action" {
   type        = string
   default     = "action/actions/AWS_EC2.InstanceId.Reboot/1.0"