terraform-aws-ec2-autoscale-group

Terraform module to provision Auto Scaling Group and Launch Template on AWS.

The module also creates AutoScaling Policies and CloudWatch Metric Alarms to monitor CPU utilization on the EC2 instances and scale the number of instance in the AutoScaling Group up or down. If you don't want to use the provided functionality, or want to provide your own policies, disable it by setting the variable autoscaling_policies_enabled to "false".

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Usage

IMPORTANT: The master branch is used in source just as an example. In your code, do not pin to master because there may be breaking changes between releases. Instead pin to the release tag (e.g. ?ref=tags/x.y.z) of one of our latest releases.

locals {
  userdata = <<-USERDATA
    #!/bin/bash
    cat <<"__EOF__" > /home/ec2-user/.ssh/config
    Host *
      StrictHostKeyChecking no
    __EOF__
    chmod 600 /home/ec2-user/.ssh/config
    chown ec2-user:ec2-user /home/ec2-user/.ssh/config
  USERDATA
}

module "autoscale_group" {
  source = "git::https://github.com/cloudposse/terraform-aws-ec2-autoscale-group.git?ref=master"

  namespace   = var.namespace
  stage       = var.stage
  environment = var.environment
  name        = var.name

  image_id                    = "ami-08cab282f9979fc7a"
  instance_type               = "t2.small"
  security_group_ids          = ["sg-xxxxxxxx"]
  subnet_ids                  = ["subnet-xxxxxxxx", "subnet-yyyyyyyy", "subnet-zzzzzzzz"]
  health_check_type           = "EC2"
  min_size                    = 2
  max_size                    = 3
  wait_for_capacity_timeout   = "5m"
  associate_public_ip_address = true
  user_data_base64            = "${base64encode(local.userdata)}"

  tags = {
    Tier              = "1"
    KubernetesCluster = "us-west-2.testing.cloudposse.co"
  }

  # Auto-scaling policies and CloudWatch metric alarms
  autoscaling_policies_enabled           = "true"
  cpu_utilization_high_threshold_percent = "70"
  cpu_utilization_low_threshold_percent  = "20"
}

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Inputs

Name	Description	Type	Default	Required
associate_public_ip_address	Associate a public IP address with an instance in a VPC	bool	`false`	no
attributes	Additional attributes (e.g. `1`)	list(string)	`<list>`	no
autoscaling_policies_enabled	Whether to create `aws_autoscaling_policy` and `aws_cloudwatch_metric_alarm` resources to control Auto Scaling	bool	`true`	no
block_device_mappings	Specify volumes to attach to the instance besides the volumes specified by the AMI	object	`<list>`	no
cpu_utilization_high_evaluation_periods	The number of periods over which data is compared to the specified threshold	number	`2`	no
cpu_utilization_high_period_seconds	The period in seconds over which the specified statistic is applied	number	`300`	no
cpu_utilization_high_statistic	The statistic to apply to the alarm's associated metric. Either of the following is supported: `SampleCount`, `Average`, `Sum`, `Minimum`, `Maximum`	string	`Average`	no
cpu_utilization_high_threshold_percent	The value against which the specified statistic is compared	number	`90`	no
cpu_utilization_low_evaluation_periods	The number of periods over which data is compared to the specified threshold	number	`2`	no
cpu_utilization_low_period_seconds	The period in seconds over which the specified statistic is applied	number	`300`	no
cpu_utilization_low_statistic	The statistic to apply to the alarm's associated metric. Either of the following is supported: `SampleCount`, `Average`, `Sum`, `Minimum`, `Maximum`	string	`Average`	no
cpu_utilization_low_threshold_percent	The value against which the specified statistic is compared	number	`10`	no
credit_specification	Customize the credit specification of the instances	object	`null`	no
default_cooldown	The amount of time, in seconds, after a scaling activity completes before another scaling activity can start	number	`300`	no
delimiter	Delimiter to be used between `name`, `namespace`, `stage`, etc.	string	`-`	no
disable_api_termination	If `true`, enables EC2 Instance Termination Protection	bool	`false`	no
ebs_optimized	If true, the launched EC2 instance will be EBS-optimized	bool	`false`	no
elastic_gpu_specifications	Specifications of Elastic GPU to attach to the instances	object	`null`	no
enable_monitoring	Enable/disable detailed monitoring	bool	`true`	no
enabled	Whether to create the resources. Set to `false` to prevent the module from creating any resources	string	`true`	no
enabled_metrics	A list of metrics to collect. The allowed values are `GroupMinSize`, `GroupMaxSize`, `GroupDesiredCapacity`, `GroupInServiceInstances`, `GroupPendingInstances`, `GroupStandbyInstances`, `GroupTerminatingInstances`, `GroupTotalInstances`	list(string)	`<list>`	no
environment	Environment, e.g. 'prod', 'staging', 'dev', 'pre-prod', 'UAT'	string	``	no
force_delete	Allows deleting the autoscaling group without waiting for all instances in the pool to terminate. You can force an autoscaling group to delete even if it's in the process of scaling a resource. Normally, Terraform drains all the instances before deleting the group. This bypasses that behavior and potentially leaves resources dangling	bool	`false`	no
health_check_grace_period	Time (in seconds) after instance comes into service before checking health	number	`300`	no
health_check_type	Controls how health checking is done. Valid values are `EC2` or `ELB`	string	`EC2`	no
iam_instance_profile_name	The IAM instance profile name to associate with launched instances	string	``	no
image_id	The EC2 image ID to launch	string	``	no
instance_initiated_shutdown_behavior	Shutdown behavior for the instances. Can be `stop` or `terminate`	string	`terminate`	no
instance_market_options	The market (purchasing) option for the instances	object	`null`	no
instance_type	Instance type to launch	string	-	yes
key_name	The SSH key name that should be used for the instance	string	``	no
launch_template_version	Launch template version. Can be version number, `$Latest` or `$Default`	string	`$Latest`	no
load_balancers	A list of elastic load balancer names to add to the autoscaling group names. Only valid for classic load balancers. For ALBs, use `target_group_arns` instead	list(string)	`<list>`	no
max_size	The maximum size of the autoscale group	number	-	yes
metrics_granularity	The granularity to associate with the metrics to collect. The only valid value is 1Minute	string	`1Minute`	no
min_elb_capacity	Setting this causes Terraform to wait for this number of instances to show up healthy in the ELB only on creation. Updates will not wait on ELB instance number changes	number	`0`	no
min_size	The minimum size of the autoscale group	number	-	yes
name	Solution name, e.g. 'app' or 'cluster'	string	`app`	no
namespace	Namespace, which could be your organization name, e.g. 'eg' or 'cp'	string	``	no
placement	The placement specifications of the instances	object	`null`	no
placement_group	The name of the placement group into which you'll launch your instances, if any	string	``	no
protect_from_scale_in	Allows setting instance protection. The autoscaling group will not select instances with this setting for terminination during scale in events	bool	`false`	no
scale_down_adjustment_type	Specifies whether the adjustment is an absolute number or a percentage of the current capacity. Valid values are `ChangeInCapacity`, `ExactCapacity` and `PercentChangeInCapacity`	string	`ChangeInCapacity`	no
scale_down_cooldown_seconds	The amount of time, in seconds, after a scaling activity completes and before the next scaling activity can start	number	`300`	no
scale_down_policy_type	The scalling policy type, either `SimpleScaling`, `StepScaling` or `TargetTrackingScaling`	string	`SimpleScaling`	no
scale_down_scaling_adjustment	The number of instances by which to scale. `scale_down_scaling_adjustment` determines the interpretation of this number (e.g. as an absolute number or as a percentage of the existing Auto Scaling group size). A positive increment adds to the current capacity and a negative value removes from the current capacity	number	`-1`	no
scale_up_adjustment_type	Specifies whether the adjustment is an absolute number or a percentage of the current capacity. Valid values are `ChangeInCapacity`, `ExactCapacity` and `PercentChangeInCapacity`	string	`ChangeInCapacity`	no
scale_up_cooldown_seconds	The amount of time, in seconds, after a scaling activity completes and before the next scaling activity can start	number	`300`	no
scale_up_policy_type	The scalling policy type, either `SimpleScaling`, `StepScaling` or `TargetTrackingScaling`	string	`SimpleScaling`	no
scale_up_scaling_adjustment	The number of instances by which to scale. `scale_up_adjustment_type` determines the interpretation of this number (e.g. as an absolute number or as a percentage of the existing Auto Scaling group size). A positive increment adds to the current capacity and a negative value removes from the current capacity	number	`1`	no
security_group_ids	A list of associated security group IDs	list(string)	`<list>`	no
service_linked_role_arn	The ARN of the service-linked role that the ASG will use to call other AWS services	string	``	no
stage	Stage, e.g. 'prod', 'staging', 'dev', or 'test'	string	``	no
subnet_ids	A list of subnet IDs to launch resources in	list(string)	-	yes
suspended_processes	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.	list(string)	`<list>`	no
tags	Additional tags (e.g. `map('BusinessUnit`,`XYZ`)	map(string)	`<map>`	no
target_group_arns	A list of aws_alb_target_group ARNs, for use with Application Load Balancing	list(string)	`<list>`	no
termination_policies	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`	list(string)	`<list>`	no
user_data_base64	The Base64-encoded user data to provide when launching the instances	string	``	no
wait_for_capacity_timeout	A maximum duration that Terraform should wait for ASG instances to be healthy before timing out. Setting this to '0' causes Terraform to skip all Capacity Waiting behavior	string	`10m`	no
wait_for_elb_capacity	Setting this will cause Terraform to wait for exactly this number of healthy instances in all attached load balancers on both create and update operations. Takes precedence over `min_elb_capacity` behavior	number	`0`	no

Outputs

Name	Description
autoscaling_group_arn	ARN of the AutoScaling Group
autoscaling_group_default_cooldown	Time between a scaling activity and the succeeding scaling activity
autoscaling_group_desired_capacity	The number of Amazon EC2 instances that should be running in the group
autoscaling_group_health_check_grace_period	Time after instance comes into service before checking health
autoscaling_group_health_check_type	`EC2` or `ELB`. Controls how health checking is done
autoscaling_group_id	The AutoScaling Group id
autoscaling_group_max_size	The maximum size of the autoscale group
autoscaling_group_min_size	The minimum size of the autoscale group
autoscaling_group_name	The AutoScaling Group name
launch_template_arn	The ARN of the launch template
launch_template_id	The ID of the launch template

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Related Projects

Check out these related projects.

terraform-aws-ec2-instance - Terraform module for providing a general purpose EC2 instance
terraform-aws-ec2-bastion-server - Terraform module to define a generic bastion host with parameterized user data
terraform-aws-ec2-admin-server - Terraform module for providing an EC2 instance capable of running admin tasks
terraform-aws-ec2-instance-group - Terraform module for provisioning multiple general purpose EC2 hosts for stateful applications
terraform-aws-ec2-ami-snapshot - Terraform module to easily generate AMI snapshots to create replica instances

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Copyright

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
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Contributors

Erik Osterman	Andriy Knysh	Igor Rodionov

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