Which solution will allow the Lambda functions to access Systems Manager parameters inside the VPC?
Configure security groups to allow access to Systems Manager.
Create an interface VPC endpoint for Systems Manager.
Use an Internet gateway from inside the VPC.
Create a gateway VPC endpoint for Systems Manager.
Explanations:
Configuring security groups alone will not enable access to Systems Manager parameters, as security groups control traffic to and from resources but do not provide the necessary endpoints to access AWS services from a VPC.
Creating an interface VPC endpoint for Systems Manager allows the Lambda functions to access Systems Manager parameters directly within the VPC without needing to traverse the public internet, which is essential for VPC resources that need to interact with AWS services.
Using an Internet gateway is not a viable solution in this case, as Lambda functions in private subnets cannot directly access the internet without NAT gateways or similar solutions. Additionally, Systems Manager is accessible via VPC endpoints, not through an internet gateway.
A gateway VPC endpoint is not applicable for Systems Manager. Systems Manager requires an interface VPC endpoint, as it is an AWS service that is accessed through a private connection rather than through a gateway endpoint.
It appears that the answer is:
Create an interface VPC endpoint for Systems Manager.