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".

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

It's 100% Open Source and licensed under the APACHE2.

We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!

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.

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 = "cloudposse/ec2-autoscale-group/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  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"
}

Available targets:

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

list(object({
    device_name  = string
    no_device    = bool
    virtual_name = string
    ebs = object({
      delete_on_termination = bool
      encrypted             = bool
      iops                  = number
      kms_key_id            = string
      snapshot_id           = string
      volume_size           = number
      volume_type           = string
    })
  }))

object({
    enabled             = bool
    namespace           = string
    environment         = string
    stage               = string
    name                = string
    delimiter           = string
    attributes          = list(string)
    tags                = map(string)
    additional_tag_map  = map(string)
    regex_replace_chars = string
    label_order         = list(string)
    id_length_limit     = number
  })

{
  "additional_tag_map": {},
  "attributes": [],
  "delimiter": null,
  "enabled": true,
  "environment": null,
  "id_length_limit": null,
  "label_order": [],
  "name": null,
  "namespace": null,
  "regex_replace_chars": null,
  "stage": null,
  "tags": {}
}

object({
    cpu_credits = string
  })

object({
    type = string
  })

[
  "GroupMinSize",
  "GroupMaxSize",
  "GroupDesiredCapacity",
  "GroupInServiceInstances",
  "GroupPendingInstances",
  "GroupStandbyInstances",
  "GroupTerminatingInstances",
  "GroupTotalInstances"
]

object({
    market_type = string
    spot_options = object({
      block_duration_minutes         = number
      instance_interruption_behavior = string
      max_price                      = number
      spot_instance_type             = string
      valid_until                    = string
    })
  })

object({
    instances_distribution = object({
      on_demand_allocation_strategy            = string
      on_demand_base_capacity                  = number
      on_demand_percentage_above_base_capacity = number
      spot_allocation_strategy                 = string
      spot_instance_pools                      = number
      spot_max_price                           = string
    })
    override = list(object({
      instance_type     = string
      weighted_capacity = number
    }))
  })

object({
    affinity          = string
    availability_zone = string
    group_name        = string
    host_id           = string
    tenancy           = string
  })

[
  "Default"
]

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Are you using this project or any of our other projects? Consider leaving a testimonial. =)

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

Got a question? We got answers.

File a GitHub issue, send us an email or join our Slack Community.

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Copyright © 2017-2020 Cloud Posse, LLC

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
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

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Erik Osterman	Andriy Knysh	Igor Rodionov