Elastic Beanstalk ASG scaling instance from 0 to 1

Question

I'm new to Elastic Beanstalk

I want to achieve the following using Beanstalk's EC2 ASG

The number of instances is 0 when there is no request, and the number of instances is automatically expanded to 1 when there is a request

However, when there is no surviving EC2 instance, the commonly used indicators preset in the console (such as disk read and write network IO, number of requests, CPU usage, etc.) cannot collect data points, resulting in the failure of automatic scaling.

Is there any way to achieve this goal?

Accepted Answer

I thought it was too late to start EC2 after a request occurred.  
This means that if there are zero EC2s, the very first request will fail.  
So I thought it would be a good idea to activate at least one of them.

From the following documentation, I found it difficult to scale when there are no values in the metrics.  
https://repost.aws/knowledge-center/elastic-beanstalk-scaling-triggers  
https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/environments-cfg-autoscaling-triggers.html

I'm not sure if this is possible, but I was wondering if there is a way to create a mechanism to output ALB access logs to CloudWatch Logs, and then create a script to create a metrics filter to determine the number of accesses from that and scale it if it is more than 0.

Elastic Beanstalk ASG scaling instance from 0 to 1

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