VPC and VPC Interactions

In AWS, a Virtual Private Cloud (VPC) is a virtual network that closely resembles a traditional network infrastructure with the benefits of cloud computing. It allows you to launch AWS resources in a logically isolated section of the AWS Cloud. VPCs provide the foundation for building and managing highly scalable and secure cloud architectures.

VPCs can interact with each other through VPC peering, which establishes a private network connection between two VPCs. VPC peering allows resources in different VPCs to communicate with each other using private IP addresses.

Here's an example code snippet in Java that demonstrates how to create two VPCs, define subnets, attach internet gateways, and establish VPC peering between them:

1class Main {
2  public static void main(String[] args) {
3    // Define VPC 1
4    Vpc vpc1 = new Vpc("VPC1");
5    Subnet subnet1 = new Subnet("subnet-1", vpc1);
6    InternetGateway igw1 = new InternetGateway("igw-1");
7    igw1.attachToVpc(vpc1);
8    RouteTable routeTable1 = new RouteTable("route-table-1", vpc1);
9    Route route1 = new Route("0.0.0.0/0", igw1, routeTable1);
10    routeTable1.associateSubnet(subnet1);
11
12    // Define VPC 2
13    Vpc vpc2 = new Vpc("VPC2");
14    Subnet subnet2 = new Subnet("subnet-2", vpc2);
15    InternetGateway igw2 = new InternetGateway("igw-2");
16    igw2.attachToVpc(vpc2);
17    RouteTable routeTable2 = new RouteTable("route-table-2", vpc2);
18    Route route2 = new Route("0.0.0.0/0", igw2, routeTable2);
19    routeTable2.associateSubnet(subnet2);
20
21    // Peering
22    VpcPeeringConnection peering = vpc1.peerWithVpc(vpc2);
23  }
24}

This code creates two VPCs (VPC1 and VPC2), each with a subnet, an internet gateway, a route table, and a route for internet traffic. The VPCs are then peered using the peerWithVpc method, establishing a private network connection between them.

VPC peering is essential for scenarios where you need to enable communication between resources in different VPCs. It allows for secure and efficient data exchange between VPCs, enabling you to build complex and interconnected cloud architectures.

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class Main {

  public static void main(String[] args) {

    // Define VPC 1

    Vpc vpc1 = new Vpc("VPC1");

    Subnet subnet1 = new Subnet("subnet-1", vpc1);

    InternetGateway igw1 = new InternetGateway("igw-1");

    igw1.attachToVpc(vpc1);

    RouteTable routeTable1 = new RouteTable("route-table-1", vpc1);

    Route route1 = new Route("0.0.0.0/0", igw1, routeTable1);

    routeTable1.associateSubnet(subnet1);

​

    // Define VPC 2

    Vpc vpc2 = new Vpc("VPC2");

    Subnet subnet2 = new Subnet("subnet-2", vpc2);

    InternetGateway igw2 = new InternetGateway("igw-2");

    igw2.attachToVpc(vpc2);

    RouteTable routeTable2 = new RouteTable("route-table-2", vpc2);

    Route route2 = new Route("0.0.0.0/0", igw2, routeTable2);

    routeTable2.associateSubnet(subnet2);

​

    // Peering

    VpcPeeringConnection peering = vpc1.peerWithVpc(vpc2);

  }

}