Terraform module for creating a ecs cluster

This Terraform module creates a ECS container cluster in Amazon. Prerequisite is to have a a VPC available. The VPC can be create via the official verified AWS VPC module, or via the our own VPC module.

The module creates a ECS cluster by default using one EC2 instance. No auto scaling is configured, currently scaling can only be done by change parameters, see examples below.

Note: Release 1.4.0 contains the following backwards incompatible changes

• Default ECS AMI is from now on the latest Amazon linux available at the time terraform is executed. The AMI version can be fixed by setting the filter variable: ecs_ami_filter, see the example below. Functional the change can be implemented backwards compatible by setting the filter to the image that you was using before the upgrade.

Terraform version

• Terraform 0.12: Pin module to ~> 2+, submit pull request to branch develop
• Terraform 0.11: Pin module to ~> 1.x, submit pull request to branch terrafomr012

Examples

• ECS cluster basic - This examples combines the usage of the VPC module, ECS cluster (this module), ECS service module, centralized logging.
• ECS cluster advanced - A slightly more advanced example. This examples combines the usage of the AWS VPC module, ECS cluster (this module), ECS service module, centralized logging and monitoring.

Usage

Below an example usages. Complete examples are provided in the examples directory.

module "ecs-cluster" {
  source = "git::https://github.com/philips-software/terraform-aws-ecs-cluster.git?ref=terraform012"

  user_data = data.template_file.ecs-instance-user-data.rendered

  aws_region  = var.aws_region
  environment = var.environment

  key_name = aws_key_pair.key.key_name

  vpc_id   = module.vpc.vpc_id
  vpc_cidr = module.vpc.vpc_cidr

  min_instance_count     = 1
  max_instance_count     = 1
  desired_instance_count = 1

  #ecs_ami_filter = ["${var.filter}"]
  instance_type = "t2.micro"

  subnet_ids = join(",", module.vpc.private_subnets)

  project = var.project

  tags = var.tags
}


data "template_file" "ecs-instance-template" {
    template = file("<my template file>")

    vars = {
        /* my template variables */
    }
}

Inputs

Name	Description	Type	Default	Required
additional_cidr_blocks	Additional CIDR blocks that will be whitelisted within the VPC next to the VPC's CIDR block. Default is an empty list.	list(string)	[]	no
additional_ingress	Additional VPC ingress.	list(object)	[]	no
aws_region	The Amazon region: currently North Virginia [us-east-1].	string	n/a	yes
desired_instance_count	The desired instance count in the cluster.	number	1	no
dynamic_scaling	Enable/disable dynamic scaling of the auto scaling group.	bool	false	no
dynamic_scaling_adjustment	The adjustment in number of instances for dynamic scaling.	number	1	no
ecs_ami_filter	The filter used to select the AMI for the ECS cluster. By default the the pattern amzn2-ami-ecs-hvm-2.0.????????-x86_64-ebs for the name is used.	list(map(string))	[ { "name": "name", "values": "amzn2-ami-ecs-hvm-2.0.????????-x86_64-ebs" } ]	no
ecs_ami_latest	Indicator to use the latest avaiable in the the list of the AMI's for the ECS cluster.	bool	true	no
ecs_ami_include_deprecated	If true, all deprecated AMIs are included in the response. If false, no deprecated AMIs are included in the response.	bool	false	no
ecs_ami_owners	A list of owners used to select the AMI for the ECS cluster.	list(string)	[ "amazon" ]	no
ecs_optimized_type	Possible values	string	"amzn2"	no
environment	Name of the environment; will be prefixed to all resources.	string	n/a	yes
instance_type	The instance type used in the cluster.	string	n/a	yes
key_name	The AWS keyname, used to create instances.	string	n/a	yes
max_instance_count	The maximum instance count in the cluster.	number	1	no
min_instance_count	The minimal instance count in the cluster.	number	1	no
project	Project identifier	string	n/a	yes
subnet_ids	List of subnets ids on which the instances will be launched.	string	n/a	yes
tags	Map of tags to apply on the resources	map(string)	{}	no
user_data	The user-data for the ec2 instances	string	n/a	yes
vpc_cidr	The CIDR block of the VPC (e.g. 10.64.48.0/23).	string	n/a	yes
vpc_id	The VPC to launch the instance in (e.g. vpc-66ecaa02).	string	n/a	yes

Outputs

Name	Description
autoscaling_group_name	Created auto scaling group for cluster.
autoscaling_policy_scaleIn_arn	Created auto scaling group policy for scaleIn.
autoscaling_policy_scaleOut_arn	Created auto scaling group policy for scaleOut.
iam_instance_profile_arn	Created IAM instance profile.
id	Id of the cluster.
instance_sg_id	Created security group for cluster instances.
name	Name of the cluster.
service_role_name	Created IAM service role name.

Automated checks

Currently the automated checks are limited. In CI the following checks are done for the root and each example.

• lint: terraform validate and terraform fmt
• basic init / get check: terraform init -get -backend=false -input=false

Automated checks

Currently the automated checks are limited. In CI the following checks are done for the root and each example.

• lint: terraform validate and terraform fmt
• basic init / get check: terraform init -get -backend=false -input=false

Generation variable documentation

A markdown table for variables can be generated as follow. Generation requires awk and terraform-docs installed.

 .ci/bin/terraform-docs.sh markdown

Philips Forest

This module is part of the Philips Forest.

                                                     ___                   _
                                                    / __\__  _ __ ___  ___| |_
                                                   / _\/ _ \| '__/ _ \/ __| __|
                                                  / / | (_) | | |  __/\__ \ |_
                                                  \/   \___/|_|  \___||___/\__|

                                                                 Infrastructure

Talk to the forestkeepers in the forest-channel on Slack.