Auto-scaling is useful to easily scale the number of EC2 instances up or down at need.
After deploying the Weka cluster via CloudFormation, it is possible to create an auto-scaling group to ease the Weka cluster size management.
You can create an auto-scaling group for your cluster by running the wekactl utility.
You can control the number of instances by either changing the desired capacity of instances from the AWS auto-scaling group console or defining your custom metrics and scaling policy in AWS. Once the desired capacity has changed, Weka will take care of safely scaling the instances.
For more information and documentation on the utility, refer to the wekactl GitHub repository.