Читать книгу AWS Certified Solutions Architect Study Guide - Ben Piper, David Higby Clinton - Страница 79

When you create an instance manually, you have to specify many configuration parameters, including an AMI, instance type, SSH key pair, security group, instance profile, block device mapping, whether it's EBS optimized, placement tenancy, and user data, such as custom scripts to install and configure your application. A launch configuration is essentially a named document that contains the same information you'd provide when manually provisioning an instance.

You can create a launch configuration from an existing EC2 instance. Auto Scaling will copy the settings from the instance for you, but you can customize them as needed. You can also create a launch configuration from scratch.

Launch configurations are for use only with EC2 Auto Scaling, meaning you can't manually launch an instance using a launch configuration. Also, once you create a launch configuration, you can't modify it. If you want to change any of the settings, you have to create an entirely new launch configuration.