Privately access a central AWS Service endpoint from multiple VPCs

This template shows a step-by-step design to privately connect to a central AWS service endpoint from multiple VPCs.
 

It does use three key AWS services:

• AWS Transit Gateway

• AWS PrivateLink

• VPC interface endpoints

With these, you can create a private link between various VPCs and an AWS shared service endpoint. All your traffic remains within AWS's private network. Nothing travels outside to the public internet. That means more secure data flow, greater control, and faster performance for your cloud configuration.

Why this template is a game changer ?

Typically, if you have 5 or 10 VPCs and each must be able to access a service, you will set up distinct public endpoints or replicate a bunch of setups. That creates additional costs, additional maintenance, and more opportunities for errors.
 

With this design, you create a central hub VPC with the necessary service endpoints. Then, via AWS Transit Gateway and AWS PrivateLink, each other VPC (a spoken VPC) is connected to that hub privately.
 

This template:

• Eliminates having to expose traffic to the internet.

• Lessens security threats because information remains private.

• Speeds up and decreases delays.

• Streamlines management because you only have one central location to manage services.

• Helps with compliance since data never actually leaves the private network.

For an expanding organisation, this is a significant improvement. Rather than fixing the same issue repeatedly in each VPC, you fix it once, properly.

Who can use this template, and when? 

This template is useful for:

•  Organisations that have workloads in numerous VPCs or AWS accounts.

• Teams who need to use AWS services such as S3, DynamoDB, or any other without relying on public internet routes.

Organisations who are concerned about security need an explicit method to route network traffic.

We should use this template when: 

• Your environment is expanding, and it's becoming difficult to manage individual endpoints.

• You require a secure and isolated connection for workloads across regions or accounts.

• You want to save money and time by centralizing access to your services.

What are the main components of the template ?

Here is a brief overview of each element of the template and what it does:

• AWS Transit Gateway – A gateway that connects many VPCs centrally in a secure way.
   
• AWS RAM (Resource Access Manager) – Enables sharing these resources between various accounts.
   
• Spoke VPC – Every individual VPC that runs your application workloads requires private access.
   
• Hub VPC – The central VPC where your common AWS service endpoints are configured.
   
• VPC Endpoints – These enable private access by connecting your VPC to AWS services using PrivateLink.
   
• Outbound Resolver – Manages DNS queries outgoing.
   
• Inbound Resolver – Manages DNS queries incoming.
   
•  EC2 Instance – An example application workload on your VPC.
   
• Security Groups – Regulate what traffic can come in or out.
   
• Attachment – The point of connection between each spoken VPC and the Transit Gateway.
   
• Availability Zones – Make your setup always available with backups in the event one zone goes down.
   
• Networking Policy – Establishes routing and traffic flow rules.

These all come together to provide you with a simple and secure mechanism to link multiple VPCs to one AWS service endpoint privately.

Getting started with Cloudairy? 

Cloudairy simplifies the use of this architecture. Below is how you can begin:

• Log in to your Cloudairy account.

• Go to the Templates section.

• Make use of the search box and enter Private Access AWS Service Endpoint.

• Select the template when it shows up in the search results.

• Press Open to load the architecture.

• Look over the diagram and follow the instructions.

• Configure your VPC attachment settings according to your own setup.

• Collaborate with your team to move security groups and routing policies.

• Use the visual flow to verify how each VPC is linked to the central endpoint.

• Once ready, you are able to export the design or deploy it directly.

Cloudairy lets you visualise everything clearly before you deploy. You can also make changes, save them, and share them with your team.

Summary 

Accessing an AWS Service endpoint from multiple VPCs allows organizations to simplify connectivity while enhancing security. This guide explains how to configure an AWS Service endpoint from multiple VPCs using PrivateLink or Transit Gateway to enable centralized and secure access. By connecting to an AWS Service endpoint from multiple VPCs, businesses can reduce network complexity, improve scalability, and avoid exposing traffic to the internet. The ability to share an AWS Service endpoint from multiple VPCs also supports cost efficiency and easier governance across multi-account environments. This architecture ensures resilient, private communication with critical AWS services.
 

This methodology saves time, minimizes risk, and maintains your cloud network tidy and organized. If you're on the lookout for a secure and scalable method to connect several VPCs to a core AWS service, this template is the perfect place to begin.