无法在 Go 代码中获取 AWS EKS 集群的 kubeconfig

Unable to obtain kubeconfig of an AWS EKS cluster in Go code

我已经创建了一个 AWS EKS 集群。为了获取它的kubeconfig,我通常运行 aws eks update-kubeconfig --name cluster-name --region us-west-2 使用shell.

但是,我现在希望在 Go 中获取 kubeconfig 而不必 运行 shell 中的任何内容(目标是在 Go 测试中创建然后操作 EKS 集群)。我能够使用以下代码描述 EKS 集群:

package main

import (
    "fmt"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/eks"
)

func main() {
    sess := session.Must(session.NewSession(&aws.Config{
        Region: aws.String("us-west-2"),
    }))
    eksSvc := eks.New(sess, aws.NewConfig().WithRegion("us-west-2"))


    clusterOutput, err := eksSvc.DescribeCluster(&eks.DescribeClusterInput{
        Name: aws.String("cluster-name"),
    })
    if err != nil {
        panic(err)
    }
    fmt.Printf("%#v\n", clusterOutput)
}

在那之后,我目前不知道如何获取该集群的 kubeconfig,然后将其与 Kubernetes 的 Go 客户端一起使用,而无需单独使用 aws eks

我已经检查了 AWS 文档、AWS CLI 代码库和 eksctl 代码库,但到目前为止都没有成功。与 EKS 集群的连接仅记录在此网页中,它使用 shell:https://aws.amazon.com/premiumsupport/knowledge-center/eks-cluster-connection/

有什么想法吗?

一般流程是这样的:

  1. DescribeCluster(正如您所做的那样)并提取一些必要的数据
  2. 使用必要的数据,使用 aws-iam-authenticatorpackage token
  3. 获取令牌
  4. 使用该令牌,在 client-go 的帮助下创建 Kubernetes 客户端集。
package main

import (
    "encoding/base64"
    "log"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"

    "github.com/aws/aws-sdk-go/service/eks"
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "k8s.io/client-go/kubernetes"
    "k8s.io/client-go/rest"

    "sigs.k8s.io/aws-iam-authenticator/pkg/token"
)

func newClientset(cluster *eks.Cluster) (*kubernetes.Clientset, error) {
    log.Printf("%+v", cluster)
    gen, err := token.NewGenerator(true, false)
    if err != nil {
        return nil, err
    }
    opts := &token.GetTokenOptions{
        ClusterID: aws.StringValue(cluster.Name),
    }
    tok, err := gen.GetWithOptions(opts)
    if err != nil {
        return nil, err
    }
    ca, err := base64.StdEncoding.DecodeString(aws.StringValue(cluster.CertificateAuthority.Data))
    if err != nil {
        return nil, err
    }
    clientset, err := kubernetes.NewForConfig(
        &rest.Config{
            Host:        aws.StringValue(cluster.Endpoint),
            BearerToken: tok.Token,
            TLSClientConfig: rest.TLSClientConfig{
                CAData: ca,
            },
        },
    )
    if err != nil {
        return nil, err
    }
    return clientset, nil
}

func main() {
    name := "wonderful-outfit-1583362361"
    region := "us-east-2"
    sess := session.Must(session.NewSession(&aws.Config{
        Region: aws.String(region),
    }))
    eksSvc := eks.New(sess)

    input := &eks.DescribeClusterInput{
        Name: aws.String(name),
    }
    result, err := eksSvc.DescribeCluster(input)
    if err != nil {
        log.Fatalf("Error calling DescribeCluster: %v", err)
    }
    clientset, err := newClientset(result.Cluster)
    if err != nil {
        log.Fatalf("Error creating clientset: %v", err)
    }
    nodes, err := clientset.CoreV1().Nodes().List(metav1.ListOptions{})
    if err != nil {
        log.Fatalf("Error getting EKS nodes: %v", err)
    }
    log.Printf("There are %d nodes associated with cluster %s", len(nodes.Items), name)
}

这是我的 go.mod 版本:

module github.com/swoldemi/sandbox

go 1.14

require (
    github.com/aws/aws-sdk-go v1.29.19
    k8s.io/apimachinery v0.0.0-20190612125636-6a5db36e93ad
    k8s.io/client-go v0.0.0-20190425172711-65184652c889
    sigs.k8s.io/aws-iam-authenticator v0.5.0
)

添加到 ,您可能还想在 GetTokenOptions 结构中传递会话,如下所示:

opts := &token.GetTokenOptions{
        ClusterID: aws.StringValue(cluster.Name),
        Session: sess,
    }
    tok, err := gen.GetWithOptions(opts)

否则 gen.GetWithOptions(opts) 调用将尝试从本地来源(例如 ~/.aws/credentials)读取您的 AWS 凭证,并且可能会失败并出现此错误:

NoCredentialProviders: no valid providers in chain. Deprecated.
    For verbose messaging see aws.Config.CredentialsChainVerboseErrors