CHORE: Add tag for auto-spotting

Author: Sumit Sarkar

README.md

@@ -4,7 +4,7 @@ A Terraform module to create an Amazon Web Services (AWS) EC2 Container Service
 
 #### NOTE
 
-Please make sure you have the exact same size lists as that of the `instance_types`. If it's smaller that the `instance_types` list, you'll face errors. 
+Please make sure you have the exact same size lists as that of the `instance_types`. If it's smaller than the `instance_types` list, you'll face errors. 
 
 ## Usage
 
@@ -86,6 +86,7 @@ module "container_service_cluster" {
 - `low_memory_threshold_percent` - List for Threshold as a percentage for low memory alarm (default: `[10]`)
 - `project` - Name of project this cluster is for (default: `Unknown`)
 - `environment` - Name of environment this cluster is targeting (default: `Unknown`)
+- `spot_enabled` - Enabling [AutoSpotting](https://github.com/cristim/autospotting) tag. It's the default tag used by AutoSpotting (default: `true`)
 
 ## Outputs
 

main.tf

@@ -81,7 +81,7 @@ resource "aws_security_group" "container_instance" {
 
   egress {
     from_port = 0
-    to_port = 65535
+    to_port = 0
     protocol = "-1"
     cidr_blocks = [
       "0.0.0.0/0"]
@@ -214,6 +214,12 @@ resource "aws_autoscaling_group" "container_instance" {
     value               = "${var.environment}"
     propagate_at_launch = true
   }
+
+  tag {
+    key                 = "spot-enabled"
+    value               = "${var.spot_enabled}"
+    propagate_at_launch = true
+  }
 }
 
 #

variables.tf

@@ -156,3 +156,8 @@ variable "low_memory_threshold_percent" {
   type = "list"
   default = ["10"]
 }
+
+
+variable "spot_enabled" {
+  default = "false"
+}