Welcome to your CDK TypeScript project

This is a blank project for CDK development with TypeScript.

The cdk.json file tells the CDK Toolkit how to execute your app.

Useful commands

npm run build compile typescript to js
npm run watch watch for changes and compile
npm run test perform the jest unit tests
cdk deploy deploy this stack to your default AWS account/region
cdk diff compare deployed stack with current state
cdk synth emits the synthesized CloudFormation template

To Bootstrap

cdk bootstrap aws://837984857695/us-east-1

To update all the packages to the same version

npx npm-check-updates -u

and then run

npm install

This will solve the error of

Multiple Environments

https://docs.aws.amazon.com/cdk/v2/guide/environments.html

TO Synth a particular stack we can just pass that as props

cdk synth stackid1
cdk deploy stackid2

Its' good to have Eslint Set up

GEnerate diagram for your project

First install the dependency

npm install ckd-dia

Then install Graphviz for Mac

brew install graphviz

First synth the project then run the following command

npx cdk-dia

or for an interactive html

npx cdk-dia --rendering cytoscape-html

Handling invalid values

const vpcId = process.env.VPC_ID;
if (!vpcId || !isValidVpcId(vpcId)) {
  throw new Error("Please provide a valid VPC_ID environment variable");
}

We can load the configuration from a remote server

axios.get("https://someconfig.mycompany.com/dev").then((devConfig) => {
  const app = new App();
  const stack = new DbStack(app, "DevDb", results);
  app.synth();
});

But if the results are not given properly we can face trouble.

So what we can do is we can create a config loader file named refreshConfig.js

axios.get("https://someconfig.mycompany.com/dev").then((devConfig) => {
  fs.readFileSync("./env/dev.json", devConfig);
});

ANd create an npm script for that.

{
  "scripts": {
    "refresh:config": "node refreshConfig.js"
  }
}

Multiple environments

We can use the cdk.json file to change the context values to provide values for different environments

Hotswapping

If only the code of the lambda changes we don't want don't need to re-deploy the whole thing. In these cases we can just update the function without changing any cloudformation

cdk synth --hotswap

Invoking lambda function locally

sam-beta-cdk local invoke CDKStackName/FunctionID -e events/mock.json -n envlocal.json

Running the local api gateway using aws sam

sam-beta-cdk local start-api -n env-local --warm-containers EAGER

Resolving cdk synth error

cdk automatically want's docker to run the synthesis. If you don't have docker installed on your machine you will get an error.

The solution is either you install docker and start it or you can just install esbuild

npm install esbuild

because it's the default thing. It will resolve your error on the pipeline

CDK Topics

Lambda triggered by sns
Lambda pushing to sns
Lambda triggered by sqs
Lambda pushing to sqs
SNS pushing to sqs
Lambda responding to Api gateway
Lambda responding to s3 upload
How to share resources between stacks
How to share resources between regions
How to setup VPC
How to setup VPC peering
Hpw to create pipeline for lambda
How to add security authorizer for lambda
How to create RDS with cdk
How to upload values to SSM parameter
How to use multiple environments
How to load environment variables dynamically
How to create a layer and use it across multiple lambda

Mohammad-Faisal/cdk-v2-template-project