A Couchbase cluster can be created on Amazon Web Services (AWS) using the AWS Command Line Interface (CLI). The process involves creating a security group, configuring the CLI, creating an AWS key pair, and then provisioning two instances to form the cluster. Each node in the cluster needs to be configured with specific details such as memory, services, authentication credentials, and loads. The script provided can be used to configure each Couchbase node. Once the nodes are added to a cluster, they need to be rebalanced to ensure data is evenly distributed across the nodes. The final step involves terminating the instances when no longer needed. This guide demonstrates how to spin up, scale, and rebalance a Couchbase cluster using AWS CLI.