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aws-terraform-ec2_asg

This module creates one or more autoscaling groups.

Basic Usage

module "asg" {
 source = "[email protected]:rackspace-infrastructure-automation/aws-terraform-ec2_asg//?ref=v0.0.11"

 ec2_os              = "amazon"
 subnets             = ["${module.vpc.private_subnets}"]
 image_id            = "${var.image_id}"
 resource_name       = "my_asg"
 security_group_list = ["${module.sg.private_web_security_group_id}"]
}

Full working references are available at examples

Inputs

Name Description Type Default Required
additional_tags Additional tags to be added to the ASG instance(s). Format: list of maps. Please see usage.tf.example in this repo for examples. list <list> no
addtional_ssm_bootstrap_list A list of maps consisting of main step actions, to be appended to SSM associations. Please see usage.tf.example in this repo for examples. list <list> no
addtional_ssm_bootstrap_step_count Count of steps added for input 'addtional_ssm_bootstrap_list'. This is required since 'addtional_ssm_bootstrap_list' is a list of maps string "0" no
asg_count Number of identical ASG's to deploy string "1" no
asg_wait_for_capacity_timeout A maximum duration that Terraform should wait for ASG instances to be healthy before timing out. string "10m" no
backup_tag_value Value of the 'Backup' tag, used to assign te EBSSnapper configuration string "False" no
cloudwatch_log_retention The number of days to retain Cloudwatch Logs for this instance. string "30" no
custom_cw_agent_config_ssm_param SSM Parameter Store name that contains a custom CloudWatch agent configuration that you would like to use as an alternative to the default provided. string "" no
cw_high_evaluations The number of periods over which data is compared to the specified threshold. string "3" no
cw_high_operator Math operator used by CloudWatch for alarms and triggers. string "GreaterThanThreshold" no
cw_high_period Time the specified statistic is applied. Must be in seconds that is also a multiple of 60. string "60" no
cw_high_threshold The value against which the specified statistic is compared. string "60" no
cw_low_evaluations The number of periods over which data is compared to the specified threshold. string "3" no
cw_low_operator Math operator used by CloudWatch for alarms and triggers. string "LessThanThreshold" no
cw_low_period Time the specified statistic is applied. Must be in seconds that is also a multiple of 60. string "300" no
cw_low_threshold The value against which the specified statistic is compared. string "30" no
cw_scaling_metric The metric to be used for scaling. string "CPUUtilization" no
detailed_monitoring Enable Detailed Monitoring? true or false string "true" no
ec2_os Intended Operating System/Distribution of Instance. Valid inputs are ('amazon', 'rhel6', 'rhel7', 'centos6', 'centos7', 'ubuntu14', 'ubuntu16', 'windows2008', 'windows2012R2', 'windows2016') string n/a yes
ec2_scale_down_adjustment Number of EC2 instances to scale down by at a time. Positive numbers will be converted to negative. string "-1" no
ec2_scale_down_cool_down Time in seconds before any further trigger-related scaling can occur. string "60" no
ec2_scale_up_adjustment Number of EC2 instances to scale up by at a time. string "1" no
ec2_scale_up_cool_down Time in seconds before any further trigger-related scaling can occur. string "60" no
enable_ebs_optimization Use EBS Optimized? true or false string "false" no
enable_rolling_updates Should this autoscaling group be targeted by the ASG Instance Replacement tool to ensure all instances are using thelatest launch configuration. string "true" no
enable_scaling_notification true or false. If 'scaling_notification_topic' is set to a non-empty string, this must be set to true. Otherwise, set to false. This variable exists due to a terraform limitation with using count and computed values as conditionals string "false" no
encrypt_secondary_ebs_volume Encrypt secondary EBS Volume? true or false string "false" no
environment Application environment for which this network is being created. Preferred value are Development, Integration, PreProduction, Production, QA, Staging, or Test string "Development" no
final_userdata_commands Commands to be given at the end of userdata for an instance. This should generally not include bootstrapping or ssm install. string "" no
health_check_grace_period Number of seconds grace during which no autoscaling actions will be taken. string "300" no
health_check_type Define the type of healthcheck for the AutoScaling group. string "EC2" no
image_id The AMI ID to be used to build the EC2 Instance. If not provided, an AMI ID will be queried with an OS specified in variable ec2_os. string "" no
initial_userdata_commands Commands to be given at the start of userdata for an instance. This should generally not include bootstrapping or ssm install. string "" no
install_codedeploy_agent Install codedeploy agent on instance(s)? true or false string "false" no
instance_profile_override Optionally provide an instance profile. Any override profile should contain the permissions required for Rackspace support tooling to continue to function if required. string "false" no
instance_profile_override_name Provide an instance profile name. Any override profile should contain the permissions required for Rackspace support tooling to continue to function if required. To use this set instance_profile_override to true. string "" no
instance_role_managed_policy_arn_count The number of policy ARNs provided/set in variable 'instance_role_managed_policy_arns' string "0" no
instance_role_managed_policy_arns List of IAM policy ARNs for the InstanceRole IAM role. IAM ARNs can be found within the Policies section of the AWS IAM console. e.g. ['arn:aws:iam::aws:policy/AmazonEC2FullAccess', 'arn:aws:iam::aws:policy/service-role/AmazonEC2RoleforSSM', 'arn:aws:iam::aws:policy/service-role/AmazonEC2SpotFleetRole'] list <list> no
instance_type EC2 Instance Type e.g. 't2.micro' string "t2.micro" no
key_pair Name of an existing EC2 KeyPair to enable SSH access to the instances. string "" no
load_balancer_names A list of Classic load balancers associated with this Auto Scaling group. list <list> no
notification_topic List of SNS Topic ARNs to use for customer notifications. list <list> no
perform_ssm_inventory_tag Determines whether Instance is tracked via System Manager Inventory. string "True" no
primary_ebs_volume_iops Iops value required for use with io1 EBS volumes. This value should be 3 times the EBS volume size string "0" no
primary_ebs_volume_size EBS Volume Size in GB string "60" no
primary_ebs_volume_type EBS Volume Type. e.g. gp2, io1, st1, sc1 string "gp2" no
provide_custom_cw_agent_config Set to true if a custom cloudwatch agent configuration has been provided in variable custom_cw_agent_config_ssm_param. string "false" no
rackspace_alarms_enabled Specifies whether alarms will create a Rackspace ticket. Ignored if rackspace_managed is set to false. string "false" no
rackspace_managed Boolean parameter controlling if instance will be fully managed by Rackspace support teams, created CloudWatch alarms that generate tickets, and utilize Rackspace managed SSM documents. string "true" no
resource_name Name to be used for the provisioned EC2 instance(s), ASG(s), and other resources provisioned in this module string n/a yes
scaling_max The maximum size of the Auto Scaling group. string "2" no
scaling_min The minimum count of EC2 instances in the Auto Scaling group. string "1" no
scaling_notification_topic SNS Topic ARN to notify if there are any scaling operations. OPTIONAL string "" no
secondary_ebs_volume_iops Iops value required for use with io1 EBS volumes. This value should be 3 times the EBS volume size string "0" no
secondary_ebs_volume_size EBS Volume Size in GB string "" no
secondary_ebs_volume_type EBS Volume Type. e.g. gp2, io1, st1, sc1 string "gp2" no
security_group_list A list (type list, not string) of EC2 security IDs to assign to this resource. list n/a yes
ssm_association_refresh_rate A cron or rate pattern to define the SSM Association refresh schedule, defaulting to once per day. See https://docs.aws.amazon.com/systems-manager/latest/userguide/sysman-cron.html for more details. Schedule can be disabled by providing an empty string. string "rate(1 day)" no
ssm_patching_group Group ID to be used by System Manager for Patching string "" no
subnets List of subnets for Application. e.g. ['subnet-8da92df7', 'subnet-9e5dc5f6', 'subnet-497eaf33'] list n/a yes
target_group_arns A list of Amazon Resource Names (ARN) of target groups to associate with the Auto Scaling group. list <list> no
tenancy The placement tenancy for EC2 devices. e.g. host, default, dedicated string "default" no
terminated_instances Specifies the maximum number of instances that can be terminated in a six hour period without generating a Cloudwatch Alarm. string "30" no

Outputs

Name Description
asg_image_id Image ID used for EC2 provisioning
asg_name_list List of ASG names
iam_role Name of the created IAM Instance role.

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