amazon web services - How to configure EC2 autoscaling based on multiple limits on same metric? -


my primary requirement follows:

when cpu consumption on instance exceeds 50 % adjust capacity of autoscaling group 5 instances, when cpu consumption exceeds 80% adjust capacity 10 instances.

however if use cloudwatch alarms set capacity can imagine following race condition:

  • 5 instances exist
  • cpu consumption exceeds 80 %
  • alarm triggered
  • capacity changed 19 instances
  • cpu consumption drops below 50 %
  • eventually cpu consumption again exceeds 50% capacity changed 5 instances (which don't want happen)

so ideally happen in response alarm triggers ensure capacity altleast corresponding threshold.

i aware can done manually setting capacity through aws sdk - triggered in response lifecycle events monitored supervisor, there better approach, preferably 1 not require setting additional supervisors or webhooks alarms ?

i suggest looking aws lambda function, triggered sns message cloudwatch - should give free reign put logic scaling decision want.

good luck!


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