How do I assign alarms to scaling policies in scaling group using aws-sdk

Question

I'm using a ruby script to help facilitate managing AutoScaling on AWS EC2. I've managed to create AMIs, create LaunchConfigurations, create ScalingGroups, and associating one another.

I'm trying to clone a scaling group, copying its launch configurations, load balancers, etc. and its scaling policies.

To copy its scaling policy I have this code:

orig_scaling_group.scaling_policies.each do |policy|
  props = Hash[%i(adjustment_type scaling_adjustment cooldown min_adjustment_step alarms).map { |s| [s, policy.send(s)] }.reject { |k, v| v.nil? }]
  clone_scaling_group.scaling_policies[policy.name].put(props)
end

(scaling_groups are instances of AWS::AutoScaling::Group)

This goes over the original's scaling policies, and extracts the data from it, and sets it as a new policy in the clone scaling group.

This works fine, except that it does not copy the alarms to the new policy. I could not find anyway in which I can programmatically assign an alarm to a scaling policy.

How can I do it?

Answer 1

I could not find anyway in which I can programmatically assign an alarm to a scaling policy.

I will be restricting my response to above statement.

In AWS Core Ruby SDK, under put_metric_alarm-instance_method API, you can use alarm_actions method. From above referred documentation:

Please note that, above information is relevant to AWS CORE SDK Ruby and not the older AWS ruby SDK.

Also for AWS-CLI, the similar settings can be found with put-metric-alarm for --alarm-actions option.

Not sure whether this what you are looking for, but here I can certainly see a programmatic way of assigning an alarm to an Autoscaling policy.

Hope this helps.