terraform-aws-ecs-ec2instances's Introduction

Terraform Module for AWS EC2 Instances for ECS

This Terraform module manages EC2 Instances and corresponding auto-scaling group for an existing ECS Cluster.

Includes least-privilege security group, dedicated IAM role, and SSM Session Manager. Optionally mounts a shared file system.

Requires:

Resources Created

IAM Role
IAM Instance Profile
Security Group for EC2 Instances
- Allows 80/443 inbound from load_balancer_sg_id
- Allows 80/443 outbound to 0.0.0.0/0
- Allows 2049 (NFS) outbound to the VPC's CIDR block
EC2 Launch Configuration
EC2 Autoscaling Group (Does NOT create scaling policies)

Name	Description	Type	Default	Required
additional_security_group_ids	Any additional security group IDs to associate to the instances	`list`	`[]`	no
asg_max_size	The maximum size for the autoscaling group	`string`	`"10"`	no
asg_min_size	The minimum size for the autoscaling group	`string`	`"3"`	no
ecs_cluster_name	ECS Cluster Name	`string`	n/a	yes
efs_id	Automatically mounts EFS to /mnt/efs if an EFS ID is provided	`string`	`""`	no
instance_type	Instance Type for Autoscaling Group	`string`	`"m5.large"`	no
load_balancer_sg_id	The security group ID associated to the load balancer (whitelisted for inbound traffic to ECS)	`string`	n/a	yes
prefix	Name Prefix	`string`	`""`	no
target_subnet_ids	The subnet IDs to launch instances into	`list`	n/a	yes
vpc_id	VPC ID	`string`	n/a	yes

Name	Description
autoscaling_group_arn	The ARN of the auto-scaling group created
autoscaling_group_id	The ID of the auto-scaling group created
base_ami_id	The base AMI used for the launch configurations
iam_instance_profile	The IAM instance profile resource block for the instance profile attached to the instances
iam_role	The IAM Role resource block for the IAM role
launch_configuration_id	The ID of the launch configuration created
launch_configuration_name	The name of the launch configuration created
security_group	The security group resource block for the security group attached to the instances

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