无权执行sts:AssumeRoleWithWebIdentity-403

我一直在尝试使用 k8s-sig 组提供的指南运行外部 dns pod。我遵循了指南的每一步，并得到了以下错误。

time="2021-02-27T13:27:20Z" level=error msg="records retrieval failed: failed to list hosted zones: WebIdentityErr: failed to retrieve credentialsncaused by: AccessDenied: Not authorized to perform sts:AssumeRoleWithWebIdentityntstatus code: 403, request id: 87a3ca86-ceb0-47be-8f90-25d0c2de9f48"

我使用 Terraform 创建了 AWS IAM 策略，并成功创建了它。除了我使用过的服务帐户的 IAM 角色之外eksctl，其他所有内容都是通过 Terraform 生成的。

但是后来我看到了这篇文章，它说使用 awscli 创建 AWS IAM 策略可以消除这个错误。所以我删除了使用 Terraform 创建的策略，并使用 awscli 重新创建它。然而，它抛出了同样的错误错误。

下面是我的外部 dns yaml 文件。

apiVersion: v1
kind: ServiceAccount
metadata:
  name: external-dns
  # If you're using Amazon EKS with IAM Roles for Service Accounts, specify the following annotation.
  # Otherwise, you may safely omit it.
  annotations:
    # Substitute your account ID and IAM service role name below.
    eks.amazonaws.com/role-arn: arn:aws:iam::268xxxxxxx:role/eksctl-ats-Eks1-addon-iamserviceaccoun-Role1-WMLL93xxxx
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  name: external-dns
rules:
- apiGroups: [""]
  resources: ["services","endpoints","pods"]
  verbs: ["get","watch","list"]
- apiGroups: ["extensions","networking.k8s.io"]
  resources: ["ingresses"]
  verbs: ["get","watch","list"]
- apiGroups: [""]
  resources: ["nodes"]
  verbs: ["list","watch"]
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: external-dns-viewer
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: external-dns
subjects:
- kind: ServiceAccount
  name: external-dns
  namespace: default
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: external-dns
spec:
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: external-dns
  template:
    metadata:
      labels:
        app: external-dns
    spec:
      serviceAccountName: external-dns
      containers:
      - name: external-dns
        image: k8s.gcr.io/external-dns/external-dns:v0.7.6
        args:
        - --source=service
        - --source=ingress
        - --domain-filter=xyz.com # will make ExternalDNS see only the hosted zones matching provided domain, omit to process all available hosted zones
        - --provider=aws
        - --policy=upsert-only # would prevent ExternalDNS from deleting any records, omit to enable full synchronization
        - --aws-zone-type=public # only look at public hosted zones (valid values are public, private or no value for both)
        - --registry=txt
        - --txt-owner-id=Z0471542U7WSPZxxxx
      securityContext:
        fsGroup: 65534 # For ExternalDNS to be able to read Kubernetes and AWS token files

我正在挠头，因为网络中的任何地方都没有针对此错误的适当解决方案。希望在本论坛中找到解决此问题的方法。

最终结果必须显示如下内容并填写托管区域中的记录。

time="2020-05-05T02:57:31Z" level=info msg="All records are already up to date"

回答

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Federated": "arn:aws:iam::${AWS_ACCOUNT_ID}:oidc-provider/${OIDC_PROVIDER}"
      },
      "Action": "sts:AssumeRoleWithWebIdentity",
      "Condition": {
        "StringEquals": {
          "${OIDC_PROVIDER}:sub": "system:serviceaccount:<my-namespace>:<my-service-account>"
        }
      }
    }
  ]
}

eksctl create iamserviceaccount 
                --name my-serviceaccount 
                --namespace <your-ns> 
                --cluster <your-cluster-name> 
                --attach-policy-arn arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess 
                --approve