# Release: EB CLI 3.17.0 on December 20, 2019
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The AWS Elastic Beanstalk Command Line Interface (EB CLI) has a new version with better support for Auto Scaling and Spot Instances.

**Release date:** December 20, 2019

## Changes
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This release of the Elastic Beanstalk Command Line Interface (EB CLI) completes the support for Spot Instances that we [added on November 25, 2019](release-2019-11-25-spot.md).

Today's release adds support for the following **eb create** arguments.
+ `--min-instances` – The minimal number of instances you require the new environment to have.
+ `--max-instances` – The maximal number of instances you allow the new environment to have.
+ `--on-demand-base-capacity` – The minimal number of On-Demand Instances that your Auto Scaling Group provisions before considering Spot Instances as your environment scales up.
+ `--on-demand-above-base-capacity` – The percentage of On-Demand Instances as part of additional capacity that your Auto Scaling Group provisions beyond the number of instances specified by the `--on-demand-base-capacity` option. 

For more information about Auto Scaling and Spot support in Elastic Beanstalk, see [Auto Scaling Group for Your Elastic Beanstalk Environment](https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.managing.as.html) in the *AWS Elastic Beanstalk Developer Guide*.