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Creating new version of service. Moving load balancers to other module
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‎README.md‎

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* Github Releases: <https://github.com/cn-terraform/terraform-aws-ecs-fargate-service/releases>
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* Terraform Module Registry: <https://registry.terraform.io/modules/cn-terraform/ecs-fargate-service/aws>
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module "ecs-fargate-service" {
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source = "cn-terraform/ecs-fargate-service/aws"
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version = "1.0.10"
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name_preffix = var.name_preffix
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profile = var.profile
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region = var.region
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vpc_id = module.networking.vpc_id
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task_definition_arn = module.td.aws_ecs_task_definition_td_arn
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container_port = module.td.container_port
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ecs_cluster_name = module.ecs-cluster.aws_ecs_cluster_cluster_name
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ecs_cluster_arn = module.ecs-cluster.aws_ecs_cluster_cluster_arn
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private_subnets = module.networking.private_subnets_ids
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public_subnets = module.networking.public_subnets_ids
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}
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Check the section "Other modules that you may need to use this module" for details about modules mentioned in the usage example.
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## Input values
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* name_preffix: Name preffix for resources on AWS.
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* profile: AWS API key credentials to use.
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* region: AWS Region the infrastructure is hosted in.
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* vpc_id: ID of the VPC.
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* task_definition_arn: (Required) The full ARN of the task definition that you want to run in your service.
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* ecs_cluster_name = Name of the ECS cluster.
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* ecs_cluster_arn: ARN of an ECS cluster.
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* subnets: The subnets associated with the task or service.
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* container_name: Name of the running container.
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* container_port: Port on which the container is listening.
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* desired_count: (Optional) The number of instances of the task definition to place and keep running. Defaults to 1.
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* platform_version: (Optional) The platform version on which to run your service. Defaults to LATEST. More information about Fargate platform versions can be found in the AWS ECS User Guide.
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* deployment_maximum_percent: (Optional) The upper limit (as a percentage of the service's desiredCount) of the number of running tasks that can be running in a service during a deployment.
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* deployment_minimum_healthy_percent: (Optional) The lower limit (as a percentage of the service's desiredCount) of the number of running tasks that must remain running and healthy in a service during a deployment.
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* enable_ecs_managed_tags: (Optional) Specifies whether to enable Amazon ECS managed tags for the tasks within the service.
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* propagate_tags: (Optional) Specifies whether to propagate the tags from the task definition or the service to the tasks. The valid values are SERVICE and TASK_DEFINITION. Default to SERVICE.
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* ordered_placement_strategy: (Optional) Service level strategy rules that are taken into consideration during task placement. List from top to bottom in order of precedence. The maximum number of ordered_placement_strategy blocks is 5. This is a list of maps where each map should contain "id" and "field".
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* health_check_grace_period_seconds: (Optional) Seconds to ignore failing load balancer health checks on newly instantiated tasks to prevent premature shutdown, up to 2147483647. Only valid for services configured to use load balancers.
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* health_check_path: (Optional) The destination for the health check request.
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* placement_constraints: (Optional) rules that are taken into consideration during task placement. Maximum number of placement_constraints is 10. This is a list of maps, where each map should contain "type" and "expression".
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* service_registries: (Optional) The service discovery registries for the service. The maximum number of service_registries blocks is 1. This is a map that should contain the following fields "registry_arn", "port", "container_port" and "container_name".
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* security_groups: (Optional) The security groups associated with the task or service. If you do not specify a security group, the default security group for the VPC is used.
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* assign_public_ip: (Optional) Assign a public IP address to the ENI (Fargate launch type only). Valid values are true or false. Default false.
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* lb_health_check_path: (Optional) Health check path for the Load Balancer
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* internal_lb: (Optional) Sets ECS service load balancer to internal and disables ECS service public ip assignment. Default false
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## Output values
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* aws_ecs_service_service_id: The Amazon Resource Name (ARN) that identifies the service.
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* aws_ecs_service_service_name: The name of the service.
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* aws_ecs_service_service_cluster: The Amazon Resource Name (ARN) of cluster which the service runs on.
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* aws_ecs_service_service_desired_count: The number of instances of the task definition.
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* lb_id: Load Balancer ID.
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* lb_arn: Load Balancer ARN.
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* lb_arn_suffix: Load Balancer ARN Suffix.
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* lb_dns_name: Load Balancer DNS Name.
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* lb_zone_id: Load Balancer Zone ID.
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* lb_sg_id: Load Balancer Security Group - The ID of the security group.
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* lb_sg_arn: Load Balancer Security Group - The ARN of the security group.
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* lb_sg_name: Load Balancer Security Group - The name of the security group.
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* lb_sg_description: Load Balancer Security Group - The description of the security group.
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* ecs_tasks_sg_id: ECS Tasks Security Group - The ID of the security group.
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* ecs_tasks_sg_arn: ECS Tasks Security Group - The ARN of the security group.
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* ecs_tasks_sg_name: ECS Tasks Security Group - The name of the security group.
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* ecs_tasks_sg_description: ECS Tasks Security Group - The description of the security group.
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## Other modules that you may need to use this module
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The networking module should look like this:
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module "networking" {
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source = "cn-terraform/networking/aws"
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version = "2.0.3"
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name_preffix = var.name_preffix
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profile = var.profile
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region = var.region
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vpc_cidr_block = "192.168.0.0/16"
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availability_zones = [ "us-east-1a", "us-east-1b", "us-east-1c", "us-east-1d" ]
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public_subnets_cidrs_per_availability_zone = [ "192.168.0.0/19", "192.168.32.0/19", "192.168.64.0/19", "192.168.96.0/19" ]
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private_subnets_cidrs_per_availability_zone = [ "192.168.128.0/19", "192.168.160.0/19", "192.168.192.0/19", "192.168.224.0/19" ]
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}
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Check versions for this module on:
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The networking module:
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* Github Releases: <https://github.com/cn-terraform/terraform-aws-networking/releases>
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* Terraform Module Registry: <https://registry.terraform.io/modules/cn-terraform/networking/aws>
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The ECS cluster module should look like this:
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module "ecs-cluster" {
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source = "cn-terraform/ecs-cluster/aws"
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version = "1.0.2"
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name_preffix = var.name_preffix
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profile = var.profile
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region = var.region
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}
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Check versions for this module on:
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The ECS cluster module:
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* Github Releases: <https://github.com/cn-terraform/terraform-aws-ecs-cluster/releases>
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* Terraform Module Registry: <https://registry.terraform.io/modules/cn-terraform/ecs-cluster/aws>
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The task definition module should like this:
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module "td" {
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source = "cn-terraform/ecs-fargate-task-definition/aws"
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version = "1.0.1"
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name_preffix = var.name_preffix
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profile = var.profile
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region = var.region
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container_name = "${var.name_preffix}-<NAME>"
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container_image = "<IMAGE_NAME>:<IMAGE_TAG>"
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container_port = <PORT>
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}
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Check versions for this module on:
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The task definition:
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* Github Releases: <https://github.com/cn-terraform/terraform-aws-ecs-fargate-task-definition/releases>
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* Terraform Module Registry: <https://registry.terraform.io/modules/cn-terraform/ecs-fargate-task-definition/aws>
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The ECS ALB module:
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* Github Releases: <https://github.com/cn-terraform/terraform-aws-ecs-alb/releases>
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* Terraform Module Registry: <https://registry.terraform.io/modules/cn-terraform/ecs-alb>

‎autoscaling.tf‎

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# ---------------------------------------------------------------------------------------------------------------------
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# AWS ECS Auto Scale Role
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# ---------------------------------------------------------------------------------------------------------------------
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resource "aws_iam_role" "ecs_autoscale_role" {
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name = "${var.name_preffix}-ecs-autoscale-role"
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assume_role_policy = file("${path.module}/files/iam/ecs_autoscale_iam_role.json")
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}
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resource "aws_iam_role_policy" "ecs_autoscale_role_policy" {
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name = "${var.name_preffix}-ecs-autoscale-role-policy"
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role = aws_iam_role.ecs_autoscale_role.id
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policy = file(
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"${path.module}/files/iam/ecs_autoscale_iam_role_policy.json",
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)
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}
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# ---------------------------------------------------------------------------------------------------------------------
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# AWS Auto Scaling - CloudWatch Alarm CPU High
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# ---------------------------------------------------------------------------------------------------------------------
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resource "aws_cloudwatch_metric_alarm" "cpu_high" {
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alarm_name = "${var.name_preffix}-cpu-high"
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comparison_operator = "GreaterThanOrEqualToThreshold"
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evaluation_periods = "3"
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metric_name = "CPUUtilization"
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namespace = "AWS/ECS"
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period = "60"
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statistic = "Maximum"
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threshold = "85"
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dimensions = {
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ClusterName = var.ecs_cluster_name
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ServiceName = aws_ecs_service.service.name
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}
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alarm_actions = [aws_appautoscaling_policy.scale_up_policy.arn]
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}
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# ---------------------------------------------------------------------------------------------------------------------
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# AWS Auto Scaling - CloudWatch Alarm CPU Low
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# ---------------------------------------------------------------------------------------------------------------------
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resource "aws_cloudwatch_metric_alarm" "cpu_low" {
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alarm_name = "${var.name_preffix}-cpu-low"
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comparison_operator = "LessThanOrEqualToThreshold"
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evaluation_periods = "3"
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metric_name = "CPUUtilization"
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namespace = "AWS/ECS"
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period = "60"
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statistic = "Average"
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threshold = "10"
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dimensions = {
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ClusterName = var.ecs_cluster_name
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ServiceName = aws_ecs_service.service.name
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}
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alarm_actions = [aws_appautoscaling_policy.scale_down_policy.arn]
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}
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# ---------------------------------------------------------------------------------------------------------------------
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# AWS Auto Scaling - Scaling Up Policy
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# ---------------------------------------------------------------------------------------------------------------------
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resource "aws_appautoscaling_policy" "scale_up_policy" {
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name = "${var.name_preffix}-scale-up-policy"
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depends_on = [aws_appautoscaling_target.scale_target]
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service_namespace = "ecs"
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resource_id = "service/${var.ecs_cluster_name}/${aws_ecs_service.service.name}"
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scalable_dimension = "ecs:service:DesiredCount"
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step_scaling_policy_configuration {
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adjustment_type = "ChangeInCapacity"
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cooldown = 60
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metric_aggregation_type = "Maximum"
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step_adjustment {
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metric_interval_lower_bound = 0
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scaling_adjustment = 1
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}
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}
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}
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# ---------------------------------------------------------------------------------------------------------------------
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# AWS Auto Scaling - Scaling Down Policy
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# ---------------------------------------------------------------------------------------------------------------------
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resource "aws_appautoscaling_policy" "scale_down_policy" {
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name = "${var.name_preffix}-scale-down-policy"
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depends_on = [aws_appautoscaling_target.scale_target]
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service_namespace = "ecs"
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resource_id = "service/${var.ecs_cluster_name}/${aws_ecs_service.service.name}"
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scalable_dimension = "ecs:service:DesiredCount"
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step_scaling_policy_configuration {
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adjustment_type = "ChangeInCapacity"
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cooldown = 60
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metric_aggregation_type = "Maximum"
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step_adjustment {
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metric_interval_lower_bound = 0
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scaling_adjustment = -1
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}
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}
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}
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# ---------------------------------------------------------------------------------------------------------------------
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# AWS Auto Scaling - Scaling Target
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# ---------------------------------------------------------------------------------------------------------------------
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resource "aws_appautoscaling_target" "scale_target" {
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service_namespace = "ecs"
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resource_id = "service/${var.ecs_cluster_name}/${aws_ecs_service.service.name}"
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scalable_dimension = "ecs:service:DesiredCount"
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role_arn = aws_iam_role.ecs_autoscale_role.arn
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min_capacity = 1
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max_capacity = 5
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}

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