feat: create VPC and subnets

infra/bin/infra.ts

@@ -3,12 +3,30 @@ import "source-map-support/register";
 import * as cdk from "aws-cdk-lib";
 import { InfraStack } from "../lib/infra-stack";
 
+// CIDR allocation strategy:
+// Top: 10.15.0.0/16
+// VPCs: 10.15.0.0/18, 10.15.64.0/18, 10.15.128.0/18, 10.15.192.0/18 (16382 addresses)
+// Subnets: ...
+
 const accounts = {
-  dev: { account: "682033502734", region: "eu-west-1" },
+  dev: {
+    account: "682033502734",
+    region: "eu-west-1",
+  },
+  network: {
+    cidrs: {
+      dev: "10.15.0.0/18",
+    },
+    maxAzs: {
+      dev: 2,
+    },
+  },
 };
 
 const app = new cdk.App();
 
-new InfraStack(app, "InfraStack", {
+const devStack = new InfraStack(app, "InfraStack", {
   env: accounts.dev,
+  cidrBlock: accounts.network.cidrs.dev,
+  maxAzs: accounts.network.maxAzs.dev,
 });

infra/cdk.context.json

@@ -0,0 +1,7 @@
+{
+  "availability-zones:account=682033502734:region=eu-west-1": [
+    "eu-west-1a",
+    "eu-west-1b",
+    "eu-west-1c"
+  ]
+}

infra/lib/infra-stack.ts

@@ -1,8 +1,19 @@
 import * as cdk from "aws-cdk-lib";
 import { Construct } from "constructs";
+import * as ec2 from "aws-cdk-lib/aws-ec2";
+
+export interface InfraStackProps extends cdk.StackProps {
+  cidrBlock: string;
+  maxAzs: number;
+}
 
 export class InfraStack extends cdk.Stack {
-  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
+  constructor(scope: Construct, id: string, props: InfraStackProps) {
     super(scope, id, props);
+
+    const vpc = new ec2.Vpc(this, "Vpc", {
+      ipAddresses: ec2.IpAddresses.cidr(props.cidrBlock),
+      maxAzs: props.maxAzs,
+    });
   }
 }