AWS CDK Advanced Topics

1. Introduction

AWS Cloud Development Kit (CDK) is a powerful framework for defining cloud infrastructure using programming languages. This lesson delves into advanced topics to enhance your infrastructure as code (IaC) skills.

2. Understanding Constructs

Constructs are the basic building blocks of AWS CDK applications. They encapsulate AWS resources and provide a higher-level abstraction.

Creating a Construct Example

import * as cdk from 'aws-cdk-lib';
import { Construct } from 'constructs';

export class MyBucketConstruct extends Construct {
    public readonly bucket: s3.Bucket;

    constructor(scope: Construct, id: string) {
        super(scope, id);
        this.bucket = new s3.Bucket(this, 'MyBucket', {
            versioned: true,
        });
    }
}
    

3. Working with Stacks and Stages

Stacks are the fundamental units of deployment in AWS CDK. Stacks can be organized into stages for better management.

Creating and Deploying Stacks

import * as cdk from 'aws-cdk-lib';
import { MyStack } from './my-stack';

const app = new cdk.App();
new MyStack(app, 'MyStack');
    

4. Using Context and Environment Variables

Context variables help customize your app's behavior based on the environment.

Accessing Context Variables

const myValue = this.node.tryGetContext('myKey');
console.log(myValue);
    

5. Creating Custom Resources

Custom resources allow you to extend CDK capabilities. They can be used to perform actions not directly supported by the CDK.

Example of a Custom Resource

import * as cdk from 'aws-cdk-lib';
import * as lambda from 'aws-cdk-lib/aws-lambda';
import * as customResources from 'aws-cdk-lib/custom-resources';

const myFunction = new lambda.Function(this, 'MyFunction', {
    runtime: lambda.Runtime.NODEJS_14_X,
    handler: 'index.handler',
    code: lambda.Code.fromAsset('lambda'),
});

new customResources.AwsCustomResource(this, 'MyCustomResource', {
    onCreate: {
        service: 'S3',
        action: 'createBucket',
        parameters: {
            BucketName: 'my-custom-bucket',
        },
        physicalResourceId: customResources.PhysicalResourceId.of(Date.now().toString()),
    },
});
    

6. FAQ