Custom Resources
Custom Resources are user-defined resources in AWS CloudFormation that are created using Amazon S3, AWS Lambda, or other custom endpoints. They serve to extend the functionality of CloudFormation by allowing you to manage custom resources using AWS CloudFormation that are not natively provided by AWS, such as third-party tools or in-house software. Custom resources follow the same management principles as other AWS resources, including creation, update, and deletion through stack operations. With custom resources, you can achieve greater flexibility and control over your templates while keeping your infrastructure and application components in a single, unified configuration.
Guide: AWS CloudFormation Custom Resources
What are AWS CloudFormation Custom Resources?
AWS CloudFormation Custom Resources are an adaptable feature of AWS CloudFormation that allows you to write custom provisioning logic and have it triggered by the AWS CloudFormation stack operation.
Importance:
They are important because they let operators provision anything. If you have software provisions that are not AWS resources, or if you want to perform hints that AWS resources do not support, you can design your AWS CloudFormation template to use custom resources.
How does AWS CloudFormation Custom Resources work?
When AWS CloudFormation encounters a custom resource within your template it sends a request to a service token - the location where the real work is executed. The function you are calling is responsible for returning a response to CloudFormation.
Exam Tips:
For the exam, remember that Custom Resources provide a way for writing custom provisioning logic and they do interact with AWS CloudFormation directly - the service token provides the respone to AWS CloudFormation. Understand how they operate and how they can be used within an AWS CloudFormation template. Think about practical examples like triggering notifications, packaging code etc.
Answering Questions on Custom Resources:
In an exam setting, look for cues in the question that suggest a need for custom provisioning logic or non-AWS resources. Always provide clear and specific examples of how AWS CloudFormation Custom Resources can be utilized for effective provisioning logic.
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