autoscaling - how to set up scaling policies

[Sathiya Shunmugasundaram]

Hello,

Does terraform provide a hook yet to create scaling policies for auto scaling groups

Thx

[Jesse Merlin]

From what I can tell by looking at the AWS provider Terraform currently does not provide this support.

https://github.com/hashicorp/terraform/tree/master/builtin/providers/aws

It looks like the support is in the AWS API client Terraform is using, just not currently implemented.

https://github.com/hashicorp/aws-sdk-go/blob/master/gen/autoscaling/autoscaling.go#L411

I wonder if this is in the roadmap, as it's a pretty key feature for auto-scaling groups.

[Sanju Burkule]

Hi

Any idea on a workaround till the create scaling policies are implemented? 

Thx

[Sathiya S]

I am using a Local Provisioner to call CLI to add scaling policy, let me know if you need as sample code

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[Andrew Matheny]

Sathiya, Can you provide that example?

[Christophe Chaudier]

Hello.

I wan't do the same things.

Sathiya, I also need some sample code.

Thank's

Christophe Chaudier

[Sathiya Shunmugasundaram]

Check out this.

• Ensure that you have AWS CLI installed in your workstation wherever you run Terraform and is in path. Just type aws and you should be able to see something
• The command creates Scaleout and Scalein policies along with CloudWatch alarms. You need an SNS Topic for alarm.
• The command creates few transient files to process in next stage after each command. You can clean up those files as needed, doesn't hurt to leave them there.
• I only used CPU metrics, feel free to extend it to other metrics 

Let me know if this helps.

Thx

Sathiya

provisioner "local-exec" {

        command = "aws autoscaling put-scaling-policy --auto-scaling-group-name ${aws_autoscaling_group.oupf-app-as.name} --policy-name ScaleIn --scaling-adjustment ${var.scalein_adjustment} --adjustment-type ChangeInCapacity > ScaleIn.json;aws autoscaling put-scaling-policy --auto-scaling-group-name ${aws_autoscaling_group.oupf-app-as.name} --policy-name ScaleOut --scaling-adjustment ${var.scaleout_adjustment} --adjustment-type ChangeInCapacity > ScaleOut.json;export SCALEOUT_POLICY=$(cat ScaleOut.json | grep PolicyARN | awk -F'\"PolicyARN\": \"' '{print $2}' | awk -F'\"' '{print $1}');export SCALEIN_POLICY=$(cat ScaleIn.json | grep PolicyARN | awk -F'\"PolicyARN\": \"' '{print $2}' | awk -F'\"' '{print $1}');echo  $SCALEOUT_POLICY > scaleout_policy ;echo $SCALEIN_POLICY > scalein_policy;aws cloudwatch put-metric-alarm --alarm-name ${aws_autoscaling_group.oupf-app-as.name}-scaleout --metric-name CPUUtilization --namespace AWS/EC2 --statistic Average --period ${var.scaleout_alarm_cpu_interval_secs} --threshold ${var.scaleout_cpu_percent} --comparison-operator GreaterThanOrEqualToThreshold --dimensions \"Name=AutoScalingGroupName,Value=${aws_autoscaling_group.oupf-app-as.name}\" --evaluation-periods ${var.scaleout_evaluation_periods} --alarm-actions $SCALEOUT_POLICY ${var.sns_topic};aws cloudwatch put-metric-alarm --alarm-name ${aws_autoscaling_group.oupf-app-as.name}-scalein --metric-name CPUUtilization --namespace AWS/EC2 --statistic Average --period ${var.scalein_alarm_cpu_interval_secs} --threshold ${var.scalein_cpu_percent} --comparison-operator LessThanOrEqualToThreshold --dimensions \"Name=AutoScalingGroupName,Value=${aws_autoscaling_group.oupf-app-as.name}\" --evaluation-periods ${var.scalein_evaluation_periods} --alarm-actions $SCALEIN_POLICY ${var.sns_topic}}"

  }

  variable "sns_topic" {

    description = "SNS Topic ID"

    default = "arn:aws:sns:us-east-1:XXXXXXXXXXX"

}

variable "scaleout_cpu_percent" {

    description = "scaleout_cpu_percent"

    default = "80"

}

variable "scalein_cpu_percent" {

    description = "scaleout_cpu_percent"

    default = "5"

}

variable "scaleout_alarm_cpu_interval_secs" {

    description = "scaleout_cpu_percent"

    default = "3600"

}

variable "scalein_alarm_cpu_interval_secs" {

    description = "scaleout_cpu_percent"

    default = "3600"

}

variable "scaleout_evaluation_periods" {

    description = "scaleout_cpu_percent"

    default = "23"

}

variable "scalein_evaluation_periods" {

    description = "scaleout_cpu_percent"

    default = "23"

}

variable "scalein_adjustment" {

    description = "scalein_adjustment"

    default = "-1"

}

variable "scaleout_adjustment" {

    description = "scalein_adjustment"

    default = "1"

[Sathiya Shunmugasundaram]

Looks like 0.6 is released and you may not need this :)

[Christophe Chaudier]

So good ^^

Juste a the good time for me ^^.

thank's,
Christophe Chaudier

Cordialement,
Christophe Chaudier

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[SATHIYA SHUNMUGASUNDARAM]

Yes, good luck

You can always use this CLI approach to glue any missing features

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