Launch Configurations
Launch Configurations are templates that define the settings for new instances that will be created as part of an Auto Scaling group. This includes the AMI (Amazon Machine Image) ID, instance type, key pair, security groups, and other instance settings such as instance storage or instance metadata. When an Auto Scaling group needs to scale up, it references the Launch Configuration to determine how to create new instances. Launch Configurations cannot be modified after they have been created, and a new Launch Configuration must be created and applied to the Auto Scaling group to modify settings for new instances.
AWS Solution Architect: Launch Configurations Guide
Launch Configurations are an essential part of the Amazon Web Services (AWS) ecosystem.
Why are they important?
They are vital because they provide templates that an Auto Scaling group uses to launch EC2 instances. They define instance configuration details which contribute to the smooth and efficient scaling of your applications.
What are they?
A launch configuration is a template that Auto Scaling uses to launch Amazon EC2 instances. When you create a launch configuration, you specify information for the instances such as the ID of the Amazon Machine Image (AMI), the instance type, key pairs, and security groups.
How do they work?
AWS uses the information in the launch configuration to launch instances. When you create an Auto Scaling group, you must specify a launch configuration. You can specify your launch configuration when you create an Auto Scaling group, and you can change it after the group is created.
Exam Tips: Answering Questions on Launch Configurations
It's vital to understand that Launch Configurations once made cannot be edited. This could be often asked in the exam. Another key point is that when we have to change the launch configuration, an entirely new configuration must be created and then updated in the Auto Scaling Group. This change does not affect existing instances, but all new instances will have the updated configuration.
Note: A keen understanding of the concepts and practice with the AWS kitchen is crucial to answering questions about Launch Configurations in the exam effectively. Each scenario-based question might need a unique approach based on the requirements specified.
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