how to test scalling of aws beanstalk environment?

To test scaling of an AWS Elastic Beanstalk environment, you can follow these steps:

1. First, ensure that your environment is configured for load balancing and auto scaling. You can do this by setting the Environment type to "Load balanced" in the Elastic Beanstalk console under the Configuration > Capacity section.

2. Configure appropriate Auto Scaling triggers based on metrics that are relevant to your application. Common metrics for benchmarking and scaling include:

   • NetworkOut (default)
   • CPUUtilization
   • RequestCount
   • TargetResponseTime

3. Set appropriate minimum and maximum instance counts. For example, you could set a minimum of 2 instances and a maximum of 4 instances.

4. Use a load testing tool to simulate high traffic or workload on your application. This is crucial for properly evaluating performance and triggering auto scaling.

5. Monitor your environment closely during the load test. You can use the Elastic Beanstalk console, CloudWatch, or other monitoring tools to observe when new instances are launched.

If you're not seeing new instances start up despite generating a lot of requests, it's possible that:

• Your scaling triggers are not configured correctly
• The thresholds for scaling are set too high
• The breach duration (the time a metric must exceed a threshold before scaling occurs) is too long

To address this, review and adjust your Auto Scaling trigger settings. You may need to lower the thresholds or adjust the breach duration to make the environment more responsive to increased load.

Remember, simply changing the instance health status to warning doesn't necessarily trigger scaling. The actual metrics you've configured for scaling (like CPU utilization or request count) need to exceed the defined thresholds for the specified duration to initiate scaling actions.

If you want to force the environment to start a new instance for testing purposes, you can manually increase the minimum number of instances in your Auto Scaling group configuration. This will cause Elastic Beanstalk to immediately launch new instances to meet the new minimum requirement.
Sources
Benchmark and scale an application in AWS Elastic Beanstalk | AWS re:Post
Auto Scaling triggers - AWS Elastic Beanstalk
Auto Scaling group for your Elastic Beanstalk environment - AWS Elastic Beanstalk
Configure your Elastic Beanstalk environment - AWS Elastic Beanstalk