main.ts

import { Construct } from 'constructs'
import { App, Chart, ChartProps } from 'cdk8s'

// imported constructs
import { KubeDeployment, KubeService, IntOrString } from './imports/k8s'

export class SampleChart extends Chart {
    constructor(scope: Construct, id: string, props: ChartProps = {}) {
        super(scope, id, props)

        // define resources here
        const label = { app: 'cdk8s-sample' }

        // notice that there is no assignment necessary when creating resources.
        // simply instantiating the resource is enough because it adds it to the construct tree via
        // the first argument, which is always the parent construct.
        // its a little confusing at first glance, but this is an inherent aspect of the constructs
        // programming model, and you will encounter it many times.
        // you can still perform an assignment of course, if you need to access
        // attributes of the resource in other parts of the code.

        new KubeService(this, 'service', {
            spec: {
                type: 'LoadBalancer',
                ports: [{ port: 80, targetPort: IntOrString.fromNumber(8080) }],
                selector: label,
            },
        })

        new KubeDeployment(this, 'deployment', {
            spec: {
                replicas: 2,
                selector: {
                    matchLabels: label,
                },
                template: {
                    metadata: { labels: label },
                    spec: {
                        containers: [
                            {
                                name: 'hello-kubernetes',
                                image: 'paulbouwer/hello-kubernetes:1.7',
                                ports: [{ containerPort: 8080 }],
                            },
                        ],
                    },
                },
            },
        })
    }
}

const app = new App()
new SampleChart(app, 'cdk8s-sample')
app.synth()