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Terraform AWS ECS Stack

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Terraform module for the deployment of an AWS Elastic Container Service (ECS) cluster.

Requirements

  • Terraform 0.11.0 or newer
  • AWS provider

Cluster module

The cluster module provisions an ECS cluster and auto scaling group of agent instances.

Input Variables

Resource tags

Name Type Required Description
cluster_label string yes Short form identifier for this cluster.
stack_item_fullname string yes Long form descriptive name for this stack item. This value is used to create the 'application' resource tag for resources created by this stack item.
stack_item_label string yes Short form identifier for this stack. This value is used to create the 'Name' resource tag for resources created by this stack item, and also serves as a unique key for re-use.

VPC parameters

Name Type Required Description
subnets list yes A list of subnet IDs to launch resources in.
vpc_id string yes ID of the target VPC.

Cluster launch configuration parameters

Name Type Required Description
ami_override string Custom Amazon Machine Image (AMI) to associate with the launch configuration.
associate_public_ip_address string Flag for associating public IP addresses with instances managed by the auto scaling group.
ebs_optimized string Flag to enable EBS optimization.
ebs_vol_del_on_term string Default: true Whether the volume should be destroyed on instance termination.
ebs_vol_device_name string The name of the device to mount.
ebs_vol_encrypted string Whether the volume should be encrypted or not. Do not use this option if you are using ebs_vol_snapshot_id as the encrypted flag will be determined by the snapshot.
ebs_vol_iops string Default: 2000 The amount of provisioned IOPS. Only utilized with ebs_vol_type of io1.
ebs_vol_size string The size of the volume in gigabytes.
ebs_vol_snapshot_id string The Snapshot ID to mount.
ebs_vol_type string Default: gp2 The type of volume. Valid values are standard, gp2 and io1.
enable_monitoring string Flag to enable detailed monitoring.
iam_path string Default: / The path to the IAM resource.
instance_based_naming_enabled string Flag to enable instance-id based name tagging. Requires the AWS CLI to be installed on the instance. Currently only supports Linux based systems.
instance_name_prefix string String to prepend instance-id based name tags with.
instance_tags map Map of tags to add to instances. Requires the AWS CLI to be installed on the instance. Currently only supports Linux based systems.
instance_type string yes The EC2 instance type to associate with the launch configuration.
key_name string The SSH key pair to associate with the launch configuration.
logs_bucket_enabled string Default: false Flag for enabling access to the logs bucket from the instances.
logs_bucket_name string Name of the S3 bucket for logging.
placement_tenancy string Default: default The tenancy of the instance. Valid values are default or dedicated.
root_vol_del_on_term string Default: true Whether the volume should be destroyed on instance termination.
root_vol_iops string Default: 2000 The amount of provisioned IOPS. Only utilized with root_vol_type of io1.
root_vol_size string The size of the volume in gigabytes.
root_vol_type string Default: gp2 The type of volume. Valid values are standard, gp2 and io1.
security_groups list Default: [] A list of security group IDs to associate with the instances.
spot_price string The price to use for reserving spot instances.
user_data_override string Custom instance initialization data to associate with the launch configuration.

Cluster auto scaling group parameters

Name Type Required Description
default_cooldown string The amount of time, in seconds, after a scaling activity completes before another scaling activity can start.
desired_capacity string The number of Amazon EC2 instances that should be running in the group.
enabled_metrics string Default: [] A list of metrics to collect. The allowed values are GroupMinSize, GroupMaxSize, GroupDesiredCapacity, GroupInServiceInstances, GroupPendingInstances, GroupStandbyInstances, GroupTerminatingInstances, GroupTotalInstances.
force_delete string Default: false Flag to allow deletion of the auto scaling group without waiting for all instances in the pool to terminate.
hc_check_type string Type of health check performed by the auto scaling group. Valid values are ELB or EC2.
hc_grace_period string Time allowed after an instance comes into service before checking health.
max_size string yes The maximum number of instances allowed by the auto scaling group.
min_size string yes Minimum number of instance to be maintained by the auto scaling group.
placement_group string The name of the placement group into which you'll launch your instances, if any.
protect_from_scale_in string Allows setting instance protection. The autoscaling group will not select instances with this setting for terminination during scale in events.
suspended_processes list Default: [] A list of processes to suspend for the AutoScaling Group. The allowed values are Launch, Terminate, HealthCheck, ReplaceUnhealthy, AZRebalance, AlarmNotification, ScheduledActions, AddToLoadBalancer. Note that if you suspend either the Launch or Terminate process types, it can prevent your autoscaling group from functioning properly.
target_group_arns list Default: [] A list of 'aws_alb_target_group' ARNs, for use with Application Load Balancing.
termination_policies list Default: [] A list of policies to decide how the instances in the auto scale group should be terminated. The allowed values are OldestInstance, NewestInstance, OldestLaunchConfiguration, ClosestToNextInstanceHour, Default.
wait_for_capacity_timeout string A maximum duration that Terraform should wait for ASG managed instances to become healthy before timing out.

Service discovery & configuration parameters

Name Type Required Description
agent_config_override string Consul agent ECS task configuration JSON.
agent_task_arn_override string Consul agent ECS task ARN.
consul_dc string Default: dc1 Consul datacenter of the specified cluster.
registrator_config_override string Registrator ECS task configuration JSON.
registrator_task_arn_override string Registrator ECS task ARN.
server_config_override string Consul server ECS task configuration JSON.
server_task_arn_override string Consul server ECS task ARN.
server_desired_count string Default: 3 The number of Consul server containers to run.
service_discovery_enabled string Default: false Flag for the deployment of Consul service discovery and configuration.
service_registration_enabled string Default: false Flag for the deployment of Registrator service registration.

Usage

module "cluster" {
  source = "github.com/unifio/terraform-aws-ecs?ref=master//cluster"

  # Resource tags
  cluster_name        = "xmpl-prod"
  stack_item_fullname = "Example Cluster"
  stack_item_label    = "xmpl"

  # VPC parameters
  subnets             = ["subnet-aaaaaaaa","subnet-bbbbbbbb","subnet-cccccccc"]
  vpc_id              = "vpc-xxxxxxxx"

  # LC parameters
  iam_path                      = "/tf_managed/"
  instance_based_naming_enabled = "true"
  instance_type                 = "t2.small"

  # ASG parameters
  max_size = "3"
  min_size = "3"

  # Service discovery parameters
  service_discovery_enabled = true
  service_registration_enabled = true
}

Outputs

Name Type Description
agent_role_id string ID of the ECS agent IAM role.
cluster_id string ID of the ECS cluster.
cluster_name string Name of the ECS cluster.
consul_sg_id string ID of the security group associated with the agent instances for enabling Consul HTTP communication.
consul_target_group_arn string ARN of the Consul server target group.
sg_id string ID of the security group associated with the agent instances.

Examples

See the examples directory for a complete set of example source files.

License

MPL 2. See LICENSE for full details.

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