能否在cdk8s中指定AWS资源？可否通过单文件代码同时管理AWS资源与Kubernetes对象？

Great questions — let's break them down one by one to clarify how these tools work together:

1. Can you specify AWS resources directly in cdk8s? #

Short answer: No, not directly. cdk8s is purpose-built to generate Kubernetes manifest files (YAML/JSON) — its entire focus is on defining Kubernetes objects like deployments, services, and CRDs. It doesn't have native support for creating or managing AWS resources like EKS clusters, S3 buckets, or IAM roles on its own.

That said, you can indirectly integrate with AWS services through Kubernetes constructs that AWS provides. For example:

• Use annotations to set up IAM Roles for Service Accounts (IRSA), linking your Kubernetes service accounts to AWS IAM roles so pods can access AWS resources.
• Define resources using CRDs from AWS-managed controllers (like the AWS Load Balancer Controller) to provision AWS load balancers via Kubernetes.
• Configure storage classes that map to AWS EBS volumes for persistent storage.

But in all these cases, cdk8s is just defining Kubernetes objects that trigger AWS to provision the underlying resources — it's not managing the AWS resources directly.

2. Can you manage both AWS resources and Kubernetes objects in a single code file? #

Absolutely! You can combine AWS CDK and cdk8s in the same project (even the same code file) to handle both cloud infrastructure and Kubernetes workloads seamlessly. Here's how it works:

• Use AWS CDK as your foundation: AWS CDK lets you create and manage all your AWS resources (like EKS clusters, security groups, IAM policies) natively. It also has built-in support for integrating cdk8s, so you can define your Kubernetes objects right alongside your AWS infrastructure.
• Share context between tools: For example, you can pass your EKS cluster's OIDC provider ARN from AWS CDK to your cdk8s code to set up IRSA correctly, ensuring your Kubernetes pods have the exact AWS permissions they need.
• Single deployment workflow: When you run cdk deploy, AWS CDK will provision your AWS resources and deploy the cdk8s-generated Kubernetes manifests to your EKS cluster in one step — no separate commands needed.

Here's a quick TypeScript example to show this in action:

import * as cdk from 'aws-cdk-lib';
import * as eks from 'aws-cdk-lib/aws-eks';
import * as cdk8s from 'cdk8s';
import { Deployment, Service } from 'cdk8s-plus-27';

class CombinedStack extends cdk.Stack {
  constructor(scope: cdk.App, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    // 1. Provision an EKS cluster with AWS CDK
    const eksCluster = new eks.Cluster(this, 'MyCluster', {
      version: eks.KubernetesVersion.V1_27,
    });

    // 2. Define Kubernetes resources with cdk8s
    const k8sApp = new cdk8s.App();
    const k8sChart = new cdk8s.Chart(k8sApp, 'WorkloadChart');

    // Nginx deployment
    new Deployment(k8sChart, 'NginxDeploy', {
      containers: [{ image: 'nginx:alpine' }],
    });

    // Load balancer service to expose Nginx
    new Service(k8sChart, 'NginxService', {
      type: cdk8s.ServiceType.LOAD_BALANCER,
      selector: { app: 'NginxDeploy' },
      ports: [{ port: 80 }],
    });

    // 3. Deploy the cdk8s chart to our EKS cluster
    eksCluster.addCdk8sChart('DeployedWorkload', k8sChart);
  }
}

const app = new cdk.App();
new CombinedStack(app, 'MyCombinedInfraStack');
app.synth();

This single file creates an EKS cluster (AWS resource) and deploys an Nginx deployment + load balancer service (Kubernetes objects) to it, all managed through one codebase.

内容的提问来源于stack exchange，提问作者seeker7