Delete the sample code from your stack #

The project created by cdk init sample-app includes an SQS queue, and an SNS topic. We’re not going to use them in our project, so remove them from the CdkWorkshopStack constructor.

Open src/CdkWorkshop/CdkWorkshopStack.cs and clean it up. Eventually it should look like this:

using Amazon.CDK;
using Constructs;

namespace CdkWorkshop
{
    public class CdkWorkshopStack : Stack
    {
        public CdkWorkshopStack(Construct scope, string id, IStackProps props = null) : base(scope, id, props)
        {
            // Nothing here!
        }
    }
}

cdk diff #

Now that we modified our stack’s contents, we can ask the toolkit to show us the difference between our CDK app and what’s currently deployed. This is a safe way to check what will happen once we run cdk deploy and is always good practice:

cdk diff

Output should look like the following:

IAM Statement Changes
┌───┬─────────────────────────────────┬────────┬─────────────────┬───────────────────────────┬──────────────────────────────────────────────────┐
│   │ Resource                        │ Effect │ Action          │ Principal                 │ Condition                                        │
├───┼─────────────────────────────────┼────────┼─────────────────┼───────────────────────────┼──────────────────────────────────────────────────┤
│ - │ ${CdkWorkshopQueue50D9D426.Arn} │ Allow  │ sqs:SendMessage │ Service:sns.amazonaws.com │ "ArnEquals": {                                   │
│   │                                 │        │                 │                           │   "aws:SourceArn": "${CdkWorkshopTopicD368A42F}" │
│   │                                 │        │                 │                           │ }                                                │
└───┴─────────────────────────────────┴────────┴─────────────────┴───────────────────────────┴──────────────────────────────────────────────────┘
(NOTE: There may be security-related changes not in this list. See http://bit.ly/cdk-2EhF7Np)

Resources
[-] AWS::SQS::Queue CdkWorkshopQueue50D9D426 destroy
[-] AWS::SQS::QueuePolicy CdkWorkshopQueuePolicyAF2494A5 destroy
[-] AWS::SNS::Topic CdkWorkshopTopicD368A42F destroy
[-] AWS::SNS::Subscription CdkWorkshopTopicCdkWorkshopQueueSubscription88D211C7 destroy

As expected, all of our resources are going to be brutally destroyed.

cdk deploy #

Run cdk deploy and proceed to the next section (no need to wait):

cdk deploy

You should see the resources being deleted.