Merge pull request #16 from AntonAleksandrov13/master

More configurations for Autoscalling

Author: jnonino

autoscaling.tf

@@ -20,12 +20,12 @@ resource "aws_iam_role_policy" "ecs_autoscale_role_policy" {
 resource "aws_cloudwatch_metric_alarm" "cpu_high" {
   alarm_name          = "${var.name_preffix}-cpu-high"
   comparison_operator = "GreaterThanOrEqualToThreshold"
-  evaluation_periods  = "3"
+  evaluation_periods  = var.max_cpu_evaluation_period
   metric_name         = "CPUUtilization"
   namespace           = "AWS/ECS"
-  period              = "60"
+  period              = var.max_cpu_period
   statistic           = "Maximum"
-  threshold           = "85"
+  threshold           = var.max_cpu_threshold
   dimensions = {
     ClusterName = var.ecs_cluster_name
     ServiceName = aws_ecs_service.service.name
@@ -39,12 +39,12 @@ resource "aws_cloudwatch_metric_alarm" "cpu_high" {
 resource "aws_cloudwatch_metric_alarm" "cpu_low" {
   alarm_name          = "${var.name_preffix}-cpu-low"
   comparison_operator = "LessThanOrEqualToThreshold"
-  evaluation_periods  = "3"
+  evaluation_periods  = var.min_cpu_evaluation_period
   metric_name         = "CPUUtilization"
   namespace           = "AWS/ECS"
-  period              = "60"
+  period              = var.min_cpu_period
   statistic           = "Average"
-  threshold           = "10"
+  threshold           = var.min_cpu_threshold
   dimensions = {
     ClusterName = var.ecs_cluster_name
     ServiceName = aws_ecs_service.service.name
@@ -100,6 +100,6 @@ resource "aws_appautoscaling_target" "scale_target" {
   resource_id        = "service/${var.ecs_cluster_name}/${aws_ecs_service.service.name}"
   scalable_dimension = "ecs:service:DesiredCount"
   role_arn           = aws_iam_role.ecs_autoscale_role.arn
-  min_capacity       = 1
-  max_capacity       = 5
+  min_capacity       = var.scale_target_min_capacity
+  max_capacity       = var.scale_target_max_capacity
 }

variables.tf

@@ -126,6 +126,51 @@ variable "ecs_cluster_name" {
   description = "Name of the ECS cluster"
 }
 
+variable "max_cpu_threshold" {
+  description = "Threshold for max CPU usage"
+  default = "85"
+  type = string
+}
+variable "min_cpu_threshold" {
+  description = "Threshold for min CPU usage"
+  default = "10"
+  type = string
+}
+
+variable "max_cpu_evaluation_period"{
+    description = "The number of periods over which data is compared to the specified threshold for max cpu metric alarm"
+    default = "3"
+    type = string
+}
+variable "min_cpu_evaluation_period"{
+    description = "The number of periods over which data is compared to the specified threshold for min cpu metric alarm"
+    default = "3"
+    type = string
+}
+
+variable "max_cpu_period"{
+    description = "The period in seconds over which the specified statistic is applied for max cpu metric alarm"
+    default = "60"
+    type = string
+}
+variable "min_cpu_period"{
+    description = "The period in seconds over which the specified statistic is applied for min cpu metric alarm"
+    default = "60"
+    type = string
+}
+
+variable "scale_target_max_capacity" {
+  description = "The max capacity of the scalable target"
+  default = 5
+  type = number
+}
+
+variable "scale_target_min_capacity" {
+  description = "The min capacity of the scalable target"
+  default = 1
+  type = number
+}
+
 #------------------------------------------------------------------------------
 # AWS LOAD BALANCER
 #------------------------------------------------------------------------------