为 CDK 中的 EKS 构造检索 LoadBalancer URL

Question

我正在使用 EKS Construct to create an EKS cluster in CDK. I'm adding the NGINX helm chart to the cluster and I want to export the ingress LoadBalancer URL. The EKS Construct exposes a .getServiceLoadBalancer() 方法，但它需要一个服务名称。我不确定如何获取 LoadBalancer 服务的名称以将其传递给该方法。感觉就像我错过了什么。示例：

export class EksClusterStack extends cdk.NestedStack {
  elbUrl: string;

  constructor(scope: cdk.Construct, id: string, props?: cdk.NestedStackProps) {
    super(scope, id, props);

    const clusterAdmin = new iam.Role(this, 'AdminRole', {
      assumedBy: new iam.AccountRootPrincipal()
    });
    
    const cluster = new eks.Cluster(this, 'Cluster', {
      mastersRole: clusterAdmin,
      version: eks.KubernetesVersion.V1_18,
      defaultCapacity: 2,
    });
            
    const nginx = cluster.addHelmChart('NginxIngress', {
      chart: 'nginx-ingress',
      repository: 'https://helm.nginx.com/stable',
    });

    this.elbUrl = cluster.getServiceLoadBalancerAddress('{Where do I get the service name?}') //<- This is what I can't figure out
}

我查看了 helm chart 上的属性，它似乎没有暴露任何符合要求的东西。感谢任何见解。谢谢！

Answer 1

您部署的是入口控制器控制图，它本身不公开任何内容，而是扫描任何类型为 Ingress 的 K8S 对象。在这种情况下，您应该在部署入口控制器之后部署入口，并且您不能使用预建函数为您获取 LoadBalancerAddress。

示例：

        self.alb_domain_name = eks.KubernetesObjectValue(
            self, 'Query',
            cluster=cluster,
            object_type='Ingress',
            object_name='cluster-ingress', # this is your ingress name
            object_namespace='my-ingress-controller', # in which namespace your ingress is deployed
            json_path='.status.loadBalancer.ingress[0].hostname' # this json path will get you the hostname for the deployed AWS ELB/ALB
        )

Answer 2

在我的特定情况下，我只需要一种方法来定义入口控制器的名称，这样它就不会自动生成。这样做会让我查询入口控制器的 ELB 地址。解决方法是为入口控制器掌舵图提供一个发布名称。部署后，CDK 将 -nginx-ingress 附加到发布名称的末尾，但根据发布名称，您可以计算出 k8s 服务名称。这是一个工作版本：

import * as cdk from '@aws-cdk/core';
import * as eks from '@aws-cdk/aws-eks';
import * as iam from '@aws-cdk/aws-iam';

export class SimpleEks extends cdk.NestedStack {
  elbUrl: string;

  constructor(scope: cdk.Construct, id: string, props?: cdk.NestedStackProps) {
    super(scope, id, props);

    const ingressControllerReleaseName = 'ingress-controller'

    const clusterAdmin = new iam.Role(this, 'AdminRole', {
      assumedBy: new iam.AccountRootPrincipal()
    });

    const cluster = new eks.Cluster(this, 'cluster', {
      clusterName: 'cluster',
      mastersRole: clusterAdmin,
      version: eks.KubernetesVersion.V1_18,
      defaultCapacity: 2,
    });

    const ingressControllerChart = cluster.addHelmChart('IngressController', {
      chart: 'nginx-ingress',
      repository: 'https://helm.nginx.com/stable',
      release: ingressControllerReleaseName, //This fixes the service name so it's predictable and not auto-generated
    });

    const albAddress = new eks.KubernetesObjectValue(this, 'elbAddress', {
      cluster,
      objectType: 'Service',
      objectName: `${ingressControllerReleaseName}-nginx-ingress`, //This is what I was missing
      jsonPath: '.status.loadBalancer.ingress[0].hostname',
    });
    // I haven't tried the below code, but I suspect it might work as well as getSvcLBAddress is just a convenience method over `eks.KubernetesObjectValue()`
    //const elb = cluster.getServiceLoadBalancerAddress(`${ingressControllerReleaseName}-nginx-ingress`);


    const elb = albAddress.value; //This is what I needed to get.
  }
}

为 CDK 中的 EKS 构造检索 LoadBalancer URL

Retrieve the LoadBalancer URL for EKS construct in CDK

amazon-web-services

amazon-eks

aws-cdk