When I use the AWS private link versus VPC peering for establishing private connectivity between different services or VPcs?
I am currently designing a network architecture for a multi-tiered application on AWS. Discuss with me when I use the AWS private link versus VPC peering to establish private connectivity between different services or VPCs within your environment. What are the considerable factors such as security, scalability, manageability, and use cases for each approach?
In the context of AWS, here is the technical term given for using AWS Private Link versus VPC peering, along with relevant code snippet:-
AWS private link
You can use the AWS private link when you need to securely expose services privately for other VPCs or AWS accounts without exposing them to the public internet.
Resource “aws_vpc_endpoint” “private_link_endpoint” {
Vpc_id = “vpc-12345678”
Service_name = “com.amazonaws.region.s3”
Private_dns_enabled = true
}
Resource “aws_security_group” “private_link_sg” {
Vpc_id = “vpc-12345678”
Ingress {
From_port = 443
To_port = 443
Protocol = “tcp”
Cidr_blocks = [“10.0.0.0/16”] # CIDR block of the VPC accessing the PrivateLink endpoint
}
Egress {
From_port = 0
To_port = 0
Protocol = “-1”
Cidr_blocks = [“0.0.0.0/0”]
}
}
VPC peering
You can use the VPC peering when you need for the purpose of establishing private communication between VPCs which would belong to the same AWS account or different AWS account:-
Resource “aws_vpc_peering_connection” “peering_connection” {
Peer_vpc_id = “vpc-abcdefg”
Vpc_id = “vpc-12345678”
Auto_accept = true
Peer_region = “us-west-2” # Specify if peering with a VPC in a different region
Accepter {
Allow_remote_vpc_dns_resolution = true
}
Requester {
Allow_remote_vpc_dns_resolution = true
}
}
Resource “aws_route” “peer_route” {
Route_table_id = “rtb-12345678” # Route table ID of the local VPC
Destination_cidr_block = “10.1.0.0/16” # CIDR block of the peered VPC
Vpc_peering_connection_id = aws_vpc_peering_connection.peering_connection.id
}