amazon web services - how to autoscale node kubernetes -

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as know can autoscale on pods here have 2 question:
1. how autoscaling nodes on kubernetes ?
2. how trigger autoscaling group aws ?

if go aws asg in web console , select minion asg

example: https://us-west-2.console.aws.amazon.com/ec2/autoscaling/home?region=us-west-2#autoscalinggroups:id=kubernetes-dev-minion-group-us-west-2a;view=details

then edit asg's min,max should more/less nodes:

adjusting num nodes in asg


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