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main.tf
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#####
# Autoscaling Target
#####
resource "aws_appautoscaling_target" "target" {
count = var.enabled ? 1 : 0
resource_id = "service/${var.cluster_name}/${var.service_name}"
scalable_dimension = "ecs:service:DesiredCount"
min_capacity = var.min_capacity
max_capacity = var.max_capacity
service_namespace = "ecs"
}
#####
# Autoscaling Policies
#####
resource "aws_appautoscaling_policy" "scale_up" {
count = var.enabled ? 1 : 0
name = "${var.name_prefix}-scale-up"
policy_type = "StepScaling"
resource_id = "service/${var.cluster_name}/${var.service_name}"
scalable_dimension = "ecs:service:DesiredCount"
service_namespace = "ecs"
step_scaling_policy_configuration {
cooldown = var.scale_up_cooldown
adjustment_type = var.adjustment_type_up
metric_aggregation_type = "Average"
min_adjustment_magnitude = var.scale_up_min_adjustment_magnitude
dynamic "step_adjustment" {
for_each = var.scale_up_step_adjustment
content {
metric_interval_lower_bound = lookup(step_adjustment.value, "metric_interval_lower_bound")
metric_interval_upper_bound = lookup(step_adjustment.value, "metric_interval_upper_bound")
scaling_adjustment = lookup(step_adjustment.value, "scaling_adjustment")
}
}
}
depends_on = [aws_appautoscaling_target.target]
}
resource "aws_appautoscaling_policy" "scale_down" {
count = var.enabled ? 1 : 0
name = "${var.name_prefix}-scale-down"
policy_type = "StepScaling"
resource_id = "service/${var.cluster_name}/${var.service_name}"
scalable_dimension = "ecs:service:DesiredCount"
service_namespace = "ecs"
step_scaling_policy_configuration {
cooldown = var.scale_down_cooldown
adjustment_type = var.adjustment_type_down
metric_aggregation_type = "Average"
min_adjustment_magnitude = var.scale_down_min_adjustment_magnitude
dynamic "step_adjustment" {
for_each = var.scale_down_step_adjustment
content {
metric_interval_lower_bound = lookup(step_adjustment.value, "metric_interval_lower_bound")
metric_interval_upper_bound = lookup(step_adjustment.value, "metric_interval_upper_bound")
scaling_adjustment = lookup(step_adjustment.value, "scaling_adjustment")
}
}
}
depends_on = [aws_appautoscaling_target.target]
}
#####
# CloudWatch Alerts
#####
resource "aws_cloudwatch_metric_alarm" "high" {
count = var.enabled ? 1 : 0
alarm_name = "${var.name_prefix}-alarm-high"
alarm_description = "Alarm monitors high utilization for scaling up"
comparison_operator = "GreaterThanThreshold"
evaluation_periods = var.high_evaluation_periods
threshold = var.high_threshold
alarm_actions = [aws_appautoscaling_policy.scale_up[0].arn]
dynamic "metric_query" {
for_each = var.metric_query
content {
id = lookup(metric_query.value, "id")
label = lookup(metric_query.value, "label", null)
return_data = lookup(metric_query.value, "return_data", null)
expression = lookup(metric_query.value, "expression", null)
dynamic "metric" {
for_each = lookup(metric_query.value, "metric", [])
content {
metric_name = lookup(metric.value, "metric_name")
namespace = lookup(metric.value, "namespace")
period = lookup(metric.value, "period")
stat = lookup(metric.value, "stat")
unit = lookup(metric.value, "unit", null)
dimensions = lookup(metric.value, "dimensions", null)
}
}
}
}
tags = var.tags
depends_on = [aws_appautoscaling_policy.scale_up]
}
resource "aws_cloudwatch_metric_alarm" "low" {
count = var.enabled ? 1 : 0
alarm_name = "${var.name_prefix}-alarm-low"
alarm_description = "Alarm monitors low utilization for scaling down."
comparison_operator = "LessThanOrEqualToThreshold"
evaluation_periods = var.low_evaluation_periods
threshold = var.low_threshold
alarm_actions = [aws_appautoscaling_policy.scale_down[0].arn]
dynamic "metric_query" {
for_each = var.metric_query
content {
id = lookup(metric_query.value, "id")
label = lookup(metric_query.value, "label", null)
return_data = lookup(metric_query.value, "return_data", null)
expression = lookup(metric_query.value, "expression", null)
dynamic "metric" {
for_each = lookup(metric_query.value, "metric", [])
content {
metric_name = lookup(metric.value, "metric_name")
namespace = lookup(metric.value, "namespace")
period = lookup(metric.value, "period")
stat = lookup(metric.value, "stat")
unit = lookup(metric.value, "unit", null)
dimensions = lookup(metric.value, "dimensions", null)
}
}
}
}
tags = var.tags
depends_on = [aws_appautoscaling_policy.scale_down]
}