CODEWITHSUNDEEP
amazon-web-servicesamazon-cloudwatchalarm
Muditha Perera
Muditha Perera

Reputation: 1252

AWS Composite Alarm - Auto scaling action

I have created two Alarms to scale up my instance count,

  1. Cpu Utilization > 20
  2. Target Response Time > 10

Then I have created a Composite alarm to go to ALARM state if Alarm 1 or 2 Triggered. Now I want to remove the above-mentioned Alarms from Scaling policies and use the composite alarm for Auto Scaling. Is it possible? If so, how can we do it?

Upvotes: 3

Views: 1806

Answers (3)

pavan
pavan

Reputation: 61

when we want to create custom alerts with mutliple metrics we can use math expressions. for ex: i want to create an alert with the combination of mem and cpu utilization so check the both mem and cpu metrics of service and click on the Add math -> conditional -> AND . then it will give you a new metric like e1 expression. and also we can edit that expression by using if conditions.

math expression example e1: IF( m1 < 30 && c1 < 30 , 1,0) which means when memory avg and cpu avg are less than 30 then only you graph on 1 else go to 0. now you can setup alarm between 0 and 1 and add an action to this alaram.

Upvotes: 6

Riz
Riz

Reputation: 1167

As Milan has already mentioned, composite alarms cannot be used in autoscaling policies. However, you can make a conditional alarm (if cpu>20 || target response >10) for 'n' minutes, go in alarm state. This way you can use this alarm in your autoscaling policy.

Upvotes: 1

Milan Muňko
Milan Muňko

Reputation: 51

It seems that Composite alarms cannot be used in Autoscaling Policies.

Upvotes: 0

Related Questions