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Cloud Posse

Terraform module to create an ECS Service for a web app (task), and an ALB target group to route requests.


This project is part of our comprehensive "SweetOps" approach towards DevOps.

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Security & Compliance

Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.

Benchmark Description
Infrastructure Security Infrastructure Security Compliance
CIS KUBERNETES Center for Internet Security, KUBERNETES Compliance
CIS AWS Center for Internet Security, AWS Compliance
CIS AZURE Center for Internet Security, AZURE Compliance
PCI-DSS Payment Card Industry Data Security Standards Compliance
NIST-800-53 National Institute of Standards and Technology Compliance
ISO27001 Information Security Management System, ISO/IEC 27001 Compliance
SOC2 Service Organization Control 2 Compliance
CIS GCP Center for Internet Security, GCP Compliance
HIPAA Health Insurance Portability and Accountability Compliance

Usage

IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#21417), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

For a complete example, see examples/complete.

For automated test of the complete example using bats and Terratest, see test.

provider "aws" {
  region = var.region
}

module "label" {
  source     = "git::https://github.com/cloudposse/terraform-null-label.git?ref=tags/0.15.0"
  namespace  = var.namespace
  name       = var.name
  stage      = var.stage
  delimiter  = var.delimiter
  attributes = var.attributes
  tags       = var.tags
}

module "vpc" {
  source     = "git::https://github.com/cloudposse/terraform-aws-vpc.git?ref=tags/0.8.1"
  namespace  = var.namespace
  stage      = var.stage
  name       = var.name
  delimiter  = var.delimiter
  attributes = var.attributes
  cidr_block = var.vpc_cidr_block
  tags       = var.tags
}

module "subnets" {
  source               = "git::https://github.com/cloudposse/terraform-aws-dynamic-subnets.git?ref=tags/0.16.1"
  availability_zones   = var.availability_zones
  namespace            = var.namespace
  stage                = var.stage
  name                 = var.name
  attributes           = var.attributes
  delimiter            = var.delimiter
  vpc_id               = module.vpc.vpc_id
  igw_id               = module.vpc.igw_id
  cidr_block           = module.vpc.vpc_cidr_block
  nat_gateway_enabled  = true
  nat_instance_enabled = false
  tags                 = var.tags
}

resource "aws_ecs_cluster" "default" {
  name = module.label.id
  tags = module.label.tags
}

module "container_definition" {
  source                       = "git::https://github.com/cloudposse/terraform-aws-ecs-container-definition.git?ref=tags/0.21.0"
  container_name               = var.container_name
  container_image              = var.container_image
  container_memory             = var.container_memory
  container_memory_reservation = var.container_memory_reservation
  container_cpu                = var.container_cpu
  essential                    = var.container_essential
  readonly_root_filesystem     = var.container_readonly_root_filesystem
  environment                  = var.container_environment
  port_mappings                = var.container_port_mappings
  log_configuration            = var.container_log_configuration
}

module "ecs_alb_service_task" {
  source = "cloudposse/ecs-alb-service-task/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"
  namespace                          = var.namespace
  stage                              = var.stage
  name                               = var.name
  attributes                         = var.attributes
  delimiter                          = var.delimiter
  alb_security_group                 = module.vpc.vpc_default_security_group_id
  container_definition_json          = module.container_definition.json
  ecs_cluster_arn                    = aws_ecs_cluster.default.arn
  launch_type                        = var.ecs_launch_type
  vpc_id                             = module.vpc.vpc_id
  security_group_ids                 = [module.vpc.vpc_default_security_group_id]
  subnet_ids                         = module.subnets.public_subnet_ids
  tags                               = var.tags
  ignore_changes_task_definition     = var.ignore_changes_task_definition
  network_mode                       = var.network_mode
  assign_public_ip                   = var.assign_public_ip
  propagate_tags                     = var.propagate_tags
  health_check_grace_period_seconds  = var.health_check_grace_period_seconds
  deployment_minimum_healthy_percent = var.deployment_minimum_healthy_percent
  deployment_maximum_percent         = var.deployment_maximum_percent
  deployment_controller_type         = var.deployment_controller_type
  desired_count                      = var.desired_count
  task_memory                        = var.task_memory
  task_cpu                           = var.task_cpu
}

The container_image in the container_definition module is the Docker image used to start a container.

The container_definition is a string of JSON-encoded container definitions. Normally, you would place only one container definition here as the example above demonstrates. However, there might be situations where more than one container per task is more appropriate such as optionally in Fargate or in other cases where sidecars may be required. With cloudposse/terraform-aws-ecs-container-definition multi-container task definitions can be created using:

module "ecs_alb_service_task" {
  ...
  container_definition_json = jsonencode([
    module.first_container.json_map_object,
    module.second_container.json_map_object,
  ])
  ...
}

Refer to the multiple definitions example in cloudposse/terraform-aws-ecs-container-definition for details on defining multiple definitions.

This string is passed directly to the Docker daemon. Images in the Docker Hub registry are available by default. Other repositories are specified with either repository-url/image:tag or repository-url/image@digest. Up to 255 letters (uppercase and lowercase), numbers, hyphens, underscores, colons, periods, forward slashes, and number signs are allowed. This parameter maps to Image in the Create a container section of the Docker Remote API and the IMAGE parameter of docker run.

When a new task starts, the Amazon ECS container agent pulls the latest version of the specified image and tag for the container to use. However, subsequent updates to a repository image are not propagated to already running tasks.

Images in Amazon ECR repositories can be specified by either using the full registry/repository:tag or registry/repository@digest. For example, 012345678910.dkr.ecr.<region-name>.amazonaws.com/<repository-name>:latest or 012345678910.dkr.ecr.<region-name>.amazonaws.com/<repository-name>@sha256:94afd1f2e64d908bc90dbca0035a5b567EXAMPLE.

Images in official repositories on Docker Hub use a single name (for example, ubuntu or mongo).

Images in other repositories on Docker Hub are qualified with an organization name (for example, amazon/amazon-ecs-agent).

Images in other online repositories are qualified further by a domain name (for example, quay.io/assemblyline/ubuntu).

For more info, see Container Definition.

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen

Requirements

Name Version
terraform >= 0.13.0
aws >= 3.34
local >= 1.3
null >= 2.0

Providers

Name Version
aws >= 3.34

Modules

Name Source Version
exec_label cloudposse/label/null 0.24.1
service_label cloudposse/label/null 0.24.1
task_label cloudposse/label/null 0.24.1
this cloudposse/label/null 0.24.1

Resources

Name Type
aws_ecs_service.default resource
aws_ecs_service.ignore_changes_desired_count resource
aws_ecs_service.ignore_changes_task_definition resource
aws_ecs_service.ignore_changes_task_definition_and_desired_count resource
aws_ecs_task_definition.default resource
aws_iam_role.ecs_exec resource
aws_iam_role.ecs_service resource
aws_iam_role.ecs_task resource
aws_iam_role_policy.ecs_exec resource
aws_iam_role_policy.ecs_service resource
aws_iam_role_policy.ecs_ssm_exec resource
aws_iam_role_policy_attachment.ecs_exec resource
aws_iam_role_policy_attachment.ecs_task resource
aws_security_group.ecs_service resource
aws_security_group_rule.alb resource
aws_security_group_rule.allow_all_egress resource
aws_security_group_rule.allow_icmp_ingress resource
aws_security_group_rule.nlb resource
aws_iam_policy_document.ecs_exec data source
aws_iam_policy_document.ecs_service data source
aws_iam_policy_document.ecs_service_policy data source
aws_iam_policy_document.ecs_ssm_exec data source
aws_iam_policy_document.ecs_task data source
aws_iam_policy_document.ecs_task_exec data source

Inputs

Name Description Type Default Required
additional_tag_map Additional tags for appending to tags_as_list_of_maps. Not added to tags. map(string) {} no
alb_security_group Security group of the ALB string "" no
assign_public_ip Assign a public IP address to the ENI (Fargate launch type only). Valid values are true or false. Default false bool false no
attributes Additional attributes (e.g. 1) list(string) [] no
capacity_provider_strategies The capacity provider strategies to use for the service. See capacity_provider_strategy configuration block: https://www.terraform.io/docs/providers/aws/r/ecs_service.html#capacity_provider_strategy
list(object({
capacity_provider = string
weight = number
base = number
}))
[] no
container_definition_json A string containing a JSON-encoded array of container definitions
("[{ "name": "container1", ... }, { "name": "container2", ... }]").
See API_ContainerDefinition,
cloudposse/terraform-aws-ecs-container-definition, or
ecs_task_definition#container_definitions
string n/a yes
container_port The port on the container to allow via the ingress security group number 80 no
context Single object for setting entire context at once.
See description of individual variables for details.
Leave string and numeric variables as null to use default value.
Individual variable settings (non-null) override settings in context object,
except for attributes, tags, and additional_tag_map, which are merged.
any
{
"additional_tag_map": {},
"attributes": [],
"delimiter": null,
"enabled": true,
"environment": null,
"id_length_limit": null,
"label_key_case": null,
"label_order": [],
"label_value_case": null,
"name": null,
"namespace": null,
"regex_replace_chars": null,
"stage": null,
"tags": {}
}
no
delimiter Delimiter to be used between namespace, environment, stage, name and attributes.
Defaults to - (hyphen). Set to "" to use no delimiter at all.
string null no
deployment_controller_type Type of deployment controller. Valid values are CODE_DEPLOY and ECS string "ECS" no
deployment_maximum_percent The upper limit of the number of tasks (as a percentage of desired_count) that can be running in a service during a deployment number 200 no
deployment_minimum_healthy_percent The lower limit (as a percentage of desired_count) of the number of tasks that must remain running and healthy in a service during a deployment number 100 no
desired_count The number of instances of the task definition to place and keep running number 1 no
ecs_cluster_arn The ARN of the ECS cluster where service will be provisioned string n/a yes
ecs_load_balancers A list of load balancer config objects for the ECS service; see ecs_service#load_balancer docs
list(object({
container_name = string
container_port = number
elb_name = string
target_group_arn = string
}))
[] no
enable_all_egress_rule A flag to enable/disable adding the all ports egress rule to the ECS security group bool true no
enable_ecs_managed_tags Specifies whether to enable Amazon ECS managed tags for the tasks within the service bool false no
enable_icmp_rule Specifies whether to enable ICMP on the security group bool false no
enabled Set to false to prevent the module from creating any resources bool null no
environment Environment, e.g. 'uw2', 'us-west-2', OR 'prod', 'staging', 'dev', 'UAT' string null no
exec_enabled Specifies whether to enable Amazon ECS Exec for the tasks within the service bool false no
force_new_deployment Enable to force a new task deployment of the service. bool false no
health_check_grace_period_seconds Seconds to ignore failing load balancer health checks on newly instantiated tasks to prevent premature shutdown, up to 7200. Only valid for services configured to use load balancers number 0 no
id_length_limit Limit id to this many characters (minimum 6).
Set to 0 for unlimited length.
Set to null for default, which is 0.
Does not affect id_full.
number null no
ignore_changes_desired_count Whether to ignore changes for desired count in the ECS service bool false no
ignore_changes_task_definition Whether to ignore changes in container definition and task definition in the ECS service bool true no
label_key_case The letter case of label keys (tag names) (i.e. name, namespace, environment, stage, attributes) to use in tags.
Possible values: lower, title, upper.
Default value: title.
string null no
label_order The naming order of the id output and Name tag.
Defaults to ["namespace", "environment", "stage", "name", "attributes"].
You can omit any of the 5 elements, but at least one must be present.
list(string) null no
label_value_case The letter case of output label values (also used in tags and id).
Possible values: lower, title, upper and none (no transformation).
Default value: lower.
string null no
launch_type The launch type on which to run your service. Valid values are EC2 and FARGATE string "FARGATE" no
name Solution name, e.g. 'app' or 'jenkins' string null no
namespace Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp' string null no
network_mode The network mode to use for the task. This is required to be awsvpc for FARGATE launch_type or null for EC2 launch_type string "awsvpc" no
nlb_cidr_blocks A list of CIDR blocks to add to the ingress rule for the NLB container port list(string) [] no
nlb_container_port The port on the container to allow via the ingress security group number 80 no
ordered_placement_strategy 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.
See ordered_placement_strategy
list(object({
type = string
field = string
}))
[] no
permissions_boundary A permissions boundary ARN to apply to the 3 roles that are created. string "" no
platform_version The platform version on which to run your service. Only applicable for launch_type set to FARGATE.
More information about Fargate platform versions can be found in the AWS ECS User Guide.
string "LATEST" no
propagate_tags Specifies whether to propagate the tags from the task definition or the service to the tasks. The valid values are SERVICE and TASK_DEFINITION string null no
proxy_configuration The proxy configuration details for the App Mesh proxy. See proxy_configuration docs https://www.terraform.io/docs/providers/aws/r/ecs_task_definition.html#proxy-configuration-arguments
object({
type = string
container_name = string
properties = map(string)
})
null no
regex_replace_chars Regex to replace chars with empty string in namespace, environment, stage and name.
If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.
string null no
scheduling_strategy The scheduling strategy to use for the service. The valid values are REPLICA and DAEMON.
Note that Fargate tasks do not support the DAEMON scheduling strategy.
string "REPLICA" no
security_group_ids Security group IDs to allow in Service network_configuration if var.network_mode = "awsvpc" list(string) [] no
service_placement_constraints The rules that are taken into consideration during task placement. Maximum number of placement_constraints is 10. See placement_constraints docs
list(object({
type = string
expression = string
}))
[] no
service_registries The service discovery registries for the service. The maximum number of service_registries blocks is 1. The currently supported service registry is Amazon Route 53 Auto Naming Service - aws_service_discovery_service; see service_registries docs https://www.terraform.io/docs/providers/aws/r/ecs_service.html#service_registries-1
list(object({
registry_arn = string
port = number
container_name = string
container_port = number
}))
[] no
service_role_arn ARN of the IAM role that allows Amazon ECS to make calls to your load balancer on your behalf. This parameter is required if you are using a load balancer with your service, but only if your task definition does not use the awsvpc network mode. If using awsvpc network mode, do not specify this role. If your account has already created the Amazon ECS service-linked role, that role is used by default for your service unless you specify a role here. string null no
stage Stage, e.g. 'prod', 'staging', 'dev', OR 'source', 'build', 'test', 'deploy', 'release' string null no
subnet_ids Subnet IDs used in Service network_configuration if var.network_mode = "awsvpc" list(string) null no
tags Additional tags (e.g. map('BusinessUnit','XYZ') map(string) {} no
task_cpu The number of CPU units used by the task. If using FARGATE launch type task_cpu must match supported memory values number 256 no
task_definition Reuse an existing task definition family and revision for the ecs service instead of creating one string null no
task_exec_policy_arns A list of IAM Policy ARNs to attach to the generated task execution role. list(string) [] no
task_exec_role_arn The ARN of IAM role that allows the ECS/Fargate agent to make calls to the ECS API on your behalf string "" no
task_memory The amount of memory (in MiB) used by the task. If using Fargate launch type task_memory must match supported cpu value number 512 no
task_placement_constraints A set of placement constraints rules that are taken into consideration during task placement.
Maximum number of placement_constraints is 10. See placement_constraints
list(object({
type = string
expression = string
}))
[] no
task_policy_arns A list of IAM Policy ARNs to attach to the generated task role. list(string) [] no
task_role_arn The ARN of IAM role that allows your Amazon ECS container task to make calls to other AWS services string "" no
use_alb_security_group A flag to enable/disable adding the ingress rule to the ALB security group bool false no
use_nlb_cidr_blocks A flag to enable/disable adding the NLB ingress rule to the security group bool false no
use_old_arn A flag to enable/disable tagging the ecs resources that require the new arn format bool false no
volumes Task volume definitions as list of configuration objects
list(object({
host_path = string
name = string
docker_volume_configuration = list(object({
autoprovision = bool
driver = string
driver_opts = map(string)
labels = map(string)
scope = string
}))
efs_volume_configuration = list(object({
file_system_id = string
root_directory = string
transit_encryption = string
transit_encryption_port = string
authorization_config = list(object({
access_point_id = string
iam = string
}))
}))
}))
[] no
vpc_id The VPC ID where resources are created string n/a yes
wait_for_steady_state If true, it will wait for the service to reach a steady state (like aws ecs wait services-stable) before continuing bool false no

Outputs

Name Description
ecs_exec_role_policy_id The ECS service role policy ID, in the form of role_name:role_policy_name
ecs_exec_role_policy_name ECS service role name
service_arn ECS Service ARN
service_name ECS Service name
service_role_arn ECS Service role ARN
service_security_group_id Security Group ID of the ECS task
task_definition_family ECS task definition family
task_definition_revision ECS task definition revision
task_exec_role_arn ECS Task exec role ARN
task_exec_role_name ECS Task role name
task_role_arn ECS Task role ARN
task_role_id ECS Task role id
task_role_name ECS Task role name

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Copyright

Copyright © 2017-2021 Cloud Posse, LLC

License

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
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  https://www.apache.org/licenses/LICENSE-2.0

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Contributors

Erik Osterman
Erik Osterman
Igor Rodionov
Igor Rodionov
Andriy Knysh
Andriy Knysh
Sarkis Varozian
Sarkis Varozian
Chris Weyl
Chris Weyl
RB
RB
Maxim Mironenko
Maxim Mironenko

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