Bonus: ejemplo de stack

How are the resources in a Stack composed?

In this article we will unravel how the various components of a Stack are organized and work in the context of AWS development. It is critical to understand the role that each resource plays, from databases to Lambda functions, and how they are integrated to form a robust and efficient system. This not only prepares you to manage stacks on AWS but extends your cloud development capabilities.

What is a metadata interface?

When implementing a stack, one of the first elements we encounter is the metadata interface. This interface is used to organize critical parameters that will be entered later in the resource configuration.

• Parameter properties: For efficient organization, it is recommended to distinguish between DynamoDB parameters and Lambda functions.
• Examples of parameters: Table name, primary key, and Lambda function name.
• Purpose: Simplifies management and avoids errors by displaying only allowed items using drop-down lists.

What resources make up the Stack?

An effective Stack gathers multiple resources and here we show you some of the most common and necessary ones:

1. DynamoDB: Highly flexible database that works with the parameters defined for its correct creation.
2. API Gateway: Tool that handles the requests made to the databases.
3. Lambda Function: Function that offers serverless computing allowing to execute code in response to events.

Each of these resources is configured with specific parameters that have been previously loaded, thus guaranteeing a robust construction of the service.

How are policies and roles handled?

Policies and roles are essential within a stack to define permissions and give security to each resource.

• Lambda Role: Contains policies that allow the Lambda function to interact with different services.
• Associated policies:
  • Permissions for S3 when extracting code.
  • Permissions to access logs in CloudWatch.
  • Permissions to query DynamoDB.

Proper role and policy mapping ensures that the Lambda function can operate frictionlessly within AWS.

Additional details on policies and permissions

In addition to basic roles and policies, it is essential to understand how the following aspects are handled:

• Execution permissions- Defined so that a service (e.g. API Gateway) can trigger a Lambda function.
• Specific restrictions: Determined according to the services that the Lambda function will need to query or log events.

Each resource within a stack has specific configurations that must be taken into account to ensure a secure and efficient operation of the infrastructure.

Why are nested stacks important?

Understanding nested stacks is essential for larger scale and more complex projects. They allow a large stack to be broken down into smaller, more manageable components, making it easier to maintain, upgrade and reuse certain components.

Get on the path of continuous learning and discover how these tools and frameworks can simplify your cloud projects. The AWS infrastructure adventure is just beginning!