AWS ParallelCluster
AWS ParallelCluster User Guide

[aws] Section

Specifies AWS Region information.

These settings apply to all clusters and they are required.

To store credentials, you can use the environment, IAM roles for Amazon EC2, or the AWS CLI, rather than saving credentials into the AWS ParallelCluster config file.

[aws] # Defaults to us-east-1 if not defined in environment or below aws_region_name = #region