Make egress rule configurable (#71)

* Make egress rule configurable

* Added documentation in readme file

---------

Co-authored-by: Pablo Rojas <[email protected]>

Author: pabloandres13

README.md

@@ -187,6 +187,7 @@ No modules.
 | <a name="input_volume"></a> [volume](#input\_volume) | (Optional) A set of volume blocks that containers in your task may use. This is a list of maps, where each map should contain "name", "host\_path", "docker\_volume\_configuration" and "efs\_volume\_configuration". Full set of options can be found at https://www.terraform.io/docs/providers/aws/r/ecs_task_definition.html | `list(any)` | `[]` | no |
 | <a name="input_vpc_id"></a> [vpc\_id](#input\_vpc\_id) | The VPC ID. | `string` | n/a | yes |
 | <a name="input_wait_for_steady_state"></a> [wait\_for\_steady\_state](#input\_wait\_for\_steady\_state) | If true, Terraform will wait for the service to reach a steady state (like aws ecs wait services-stable) before continuing. | `bool` | `false` | no |
+| <a name="deny_egress_to_anywhere"></a> [deny\_egress\_to\_anywhere](#deny\_egress\_to\_anywhere) | If true, Terraform will no create the default egress rule which allows all outgoing traffic. | `bool` | `false` | no |
 
 ## Outputs
 

main.tf

@@ -88,6 +88,7 @@ resource "aws_security_group" "ecs_service" {
 }
 
 resource "aws_security_group_rule" "egress_service" {
+  count             = var.deny_egress_to_anywhere ? 0 : 1
   security_group_id = aws_security_group.ecs_service.id
   type              = "egress"
   protocol          = "-1"

variables.tf

@@ -345,3 +345,9 @@ variable "readonlyRootFilesystem" {
   description = "When this parameter is true, the container is given read-only access to its root file system"
   type        = bool
 }
+
+variable "deny_egress_to_anywhere" {
+  default     = false
+  description = "When this parameter is true, no default egress rule will be created"
+  type        = bool
+}