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Create a customer managed key. Use the key to encrypt the RDS databases.

Use an AWS managed key to encrypt the RDS databases. Enable automatic key rotation.

Import an external KMS key with custom key material. Use the key to encrypt the RDS databases.

Use an AWS owned key to encrypt the RDS databases.

Add an X-API-Key header in the HTTP request for authentication.

Use an interface endpoint for AWS Lambda.

Configure a gateway endpoint for AWS Lambda.

Introduce an Amazon SNS topic between the API Gateway and Lambda.

Assess the on-premises workloads by deploying AWS Application Discovery Agent on the bare-metal servers and virtual machines.

Assess the on-premises workloads by deploying AWS Systems Manager Agent on the bare-metal servers and virtual machines.

Organize servers into migration groups by using AWS Systems Manager Application Manager.

Organize servers into migration groups by using AWS Migration Hub.

Generate suggested EC2 instance types and associated pricing by using AWS Migration Hub.

Import server sizing data into AWS Trusted Advisor and implement its cost-optimization recommendations.

Implement an internal Network Load Balancer (NLB) linked to a target group pointing to the Lambda functions. Use the NLB's DNS name for API calls from the VPC.

Delete the current API's public DNS record. Create a private hosted zone in Route 53 with a new CNAME record pointing to the API. Update the API Gateway configuration to use this CNAME. Access the API via the new DNS record from the VPC.

Change the API endpoint type to private in API Gateway. Establish an interface VPC endpoint in the VPC. Apply a resource policy to the API restricting access to the VPC endpoint. Use the VPC endpoint to invoke the API from within the VPC.

Migrate the Lambda functions to run within the VPC. Set up an EC2 instance with Nginx as a reverse proxy. Configure the Nginx server to forward requests to the Lambda functions. Use the EC2 instance's private DNS to access the API internally.

Remove the API key from the Lambda environment. Use IAM roles for API authentication.

Move the API key from Lambda environment variables to AWS Systems Manager Parameter Store.

Move the API key from Lambda environment variables to AWS Key Management Service (AWS KMS).

Move the API key from the Lambda environment to an encrypted .txt file. Store the file in an S3 bucket.

Use Amazon Cognito user pools to manage user accounts. Configure an Amazon Cognito user pool authorizer in API Gateway to control access. Use Lambda to store e-books and metadata directly in DynamoDB. Retrieve e-books directly from DynamoDB.

Use Amazon Cognito user pools to manage user accounts. Configure an Amazon Cognito user pool authorizer in API Gateway to control access. Use Lambda to store e-books in Amazon S3 and record the S3 keys in DynamoDB. Retrieve e-books by querying DynamoDB for the S3 keys.

Create an IAM user for each application user during sign-up. Use IAM authentication for API Gateway. Use Lambda to store e-books in Amazon S3 and record the S3 keys in DynamoDB. Retrieve e-books by querying DynamoDB for the S3 keys.

Create a DynamoDB table to manage user accounts. Implement a Lambda authorizer to validate credentials against the table and integrate it with API Gateway. Use Lambda to store e-books in Amazon S3 and record the S3 keys in DynamoDB. Retrieve e-books by querying DynamoDB for the S3 keys.