feat(ec2): add privateIpAddress to Instance

Add an optional privateIpAddress prop to the Instance class to allow the specification of a Private IP address

Fixes #4004

packages/@aws-cdk/aws-ec2/lib/instance.ts

@@ -167,6 +167,15 @@ export interface InstanceProps {
    * @default true
    */
   readonly sourceDestCheck?: boolean;
+
+  /**
+   * Defines a private IP address to associate with an instance.
+   *
+   * Private IP should be available within the VPC that the instance is build within.
+   *
+   * @default - no association
+   */
+  readonly privateIpAddress?: string
 }
 
 /**
@@ -284,6 +293,7 @@ export class Instance extends Resource implements IInstance {
       subnetId: subnet.subnetId,
       availabilityZone: subnet.availabilityZone,
       sourceDestCheck: props.sourceDestCheck,
+      privateIpAddress: props.privateIpAddress
     });
     this.instance.node.addDependency(this.role);
 

packages/@aws-cdk/aws-ec2/test/test.instance.ts

@@ -100,6 +100,27 @@ export = {
       },
     }));
 
+    test.done();
+  },
+  'instance can be created with Private IP Address'(test: Test) {
+    // GIVEN
+    const stack = new Stack();
+    const vpc = new Vpc(stack, 'VPC');
+
+    // WHEN
+    new Instance(stack, 'Instance', {
+      vpc,
+      machineImage: new AmazonLinuxImage(),
+      instanceType: InstanceType.of(InstanceClass.T3, InstanceSize.LARGE),
+      privateIpAddress: "10.0.0.2"
+    });
+
+    // THEN
+    expect(stack).to(haveResource('AWS::EC2::Instance', {
+      InstanceType: 't3.large',
+      PrivateIpAddress: '10.0.0.2'
+    }));
+
     test.done();
   },
 };