設定服務帳戶的 IAM 角色

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設定服務帳戶的 IAM 角色 - Amazon Managed Service for Prometheus

自 Amazon EKS 叢集設定指標擷取作業的服務角色設定服務帳戶的 IAM 角色，以查詢指標

透過服務帳戶的 IAM 角色，您可以產生 IAM 角色與 Kubernetes 服務帳戶的關聯。然後，此服務帳戶可以為使用該服務帳戶的任何 Pod 中的容器提供 AWS 許可。如需詳細資訊，請參閱服務帳戶的 IAM 角色。

服務帳戶的 IAM 角色也稱為服務角色。

在 Amazon Managed Service for Prometheus 中，使用服務角色可協助您取得在 Amazon Managed Service for Prometheus、Prometheus 伺服器和 Grafana 伺服器之間授權和驗證所需的角色。

先決條件

此頁面的程序需要您安裝 AWS CLI 和 EKSCTL 命令列界面。

自 Amazon EKS 叢集設定指標擷取作業的服務角色

若要在 Amazon EKS 叢集設定服務角色以讓 Amazon Managed Service for Prometheus 自 Prometheus 伺服器擷取指標，您必須登入具有下列許可的帳戶：

iam:CreateRole
iam:CreatePolicy
iam:GetRole
iam:AttachRolePolicy
iam:GetOpenIDConnectProvider

設定 Amazon Managed Service for Prometheus 擷取作業的服務角色

建立名為 createIRSA-AMPIngest.sh 且具有下列內容的檔案。將 <my_amazon_eks_clustername> 替換為您的叢集名稱，並將 <my_prometheus_namespace> 替換為 Prometheus 命名空間。


#!/bin/bash -e
CLUSTER_NAME=<my_amazon_eks_clustername>
SERVICE_ACCOUNT_NAMESPACE=<my_prometheus_namespace>
AWS_ACCOUNT_ID=$(aws sts get-caller-identity --query "Account" --output text)
OIDC_PROVIDER=$(aws eks describe-cluster --name $CLUSTER_NAME --query "cluster.identity.oidc.issuer" --output text | sed -e "s/^https:\/\///")
SERVICE_ACCOUNT_AMP_INGEST_NAME=amp-iamproxy-ingest-service-account
SERVICE_ACCOUNT_IAM_AMP_INGEST_ROLE=amp-iamproxy-ingest-role
SERVICE_ACCOUNT_IAM_AMP_INGEST_POLICY=AMPIngestPolicy
#
# Set up a trust policy designed for a specific combination of K8s service account and namespace to sign in from a Kubernetes cluster which hosts the OIDC Idp.
#
cat <<EOF > TrustPolicy.json
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Federated": "arn:aws:iam::${AWS_ACCOUNT_ID}:oidc-provider/${OIDC_PROVIDER}"
      },
      "Action": "sts:AssumeRoleWithWebIdentity",
      "Condition": {
        "StringEquals": {
          "${OIDC_PROVIDER}:sub": "system:serviceaccount:${SERVICE_ACCOUNT_NAMESPACE}:${SERVICE_ACCOUNT_AMP_INGEST_NAME}"
        }
      }
    }
  ]
}
EOF
#
# Set up the permission policy that grants ingest (remote write) permissions for all AMP workspaces
#
cat <<EOF > PermissionPolicyIngest.json
{
  "Version": "2012-10-17",
   "Statement": [
       {"Effect": "Allow",
        "Action": [
           "aps:RemoteWrite", 
           "aps:GetSeries", 
           "aps:GetLabels",
           "aps:GetMetricMetadata"
        ], 
        "Resource": "*"
      }
   ]
}
EOF

function getRoleArn() {
  OUTPUT=$(aws iam get-role --role-name $1 --query 'Role.Arn' --output text 2>&1)

  # Check for an expected exception
  if [[ $? -eq 0 ]]; then
    echo $OUTPUT
  elif [[ -n $(grep "NoSuchEntity" <<< $OUTPUT) ]]; then
    echo ""
  else
    >&2 echo $OUTPUT
    return 1
  fi
}

#
# Create the IAM Role for ingest with the above trust policy
#
SERVICE_ACCOUNT_IAM_AMP_INGEST_ROLE_ARN=$(getRoleArn $SERVICE_ACCOUNT_IAM_AMP_INGEST_ROLE)
if [ "$SERVICE_ACCOUNT_IAM_AMP_INGEST_ROLE_ARN" = "" ]; 
then
  #
  # Create the IAM role for service account
  #
  SERVICE_ACCOUNT_IAM_AMP_INGEST_ROLE_ARN=$(aws iam create-role \
  --role-name $SERVICE_ACCOUNT_IAM_AMP_INGEST_ROLE \
  --assume-role-policy-document file://TrustPolicy.json \
  --query "Role.Arn" --output text)
  #
  # Create an IAM permission policy
  #
  SERVICE_ACCOUNT_IAM_AMP_INGEST_ARN=$(aws iam create-policy --policy-name $SERVICE_ACCOUNT_IAM_AMP_INGEST_POLICY \
  --policy-document file://PermissionPolicyIngest.json \
  --query 'Policy.Arn' --output text)
  #
  # Attach the required IAM policies to the IAM role created above
  #
  aws iam attach-role-policy \
  --role-name $SERVICE_ACCOUNT_IAM_AMP_INGEST_ROLE \
  --policy-arn $SERVICE_ACCOUNT_IAM_AMP_INGEST_ARN  
else
    echo "$SERVICE_ACCOUNT_IAM_AMP_INGEST_ROLE_ARN IAM role for ingest already exists"
fi
echo $SERVICE_ACCOUNT_IAM_AMP_INGEST_ROLE_ARN
#
# EKS cluster hosts an OIDC provider with a public discovery endpoint.
# Associate this IdP with AWS IAM so that the latter can validate and accept the OIDC tokens issued by Kubernetes to service accounts.
# Doing this with eksctl is the easier and best approach.
#
eksctl utils associate-iam-oidc-provider --cluster $CLUSTER_NAME --approve

請輸入下列命令，賦予指令碼必要權限。
```
chmod +x createIRSA-AMPIngest.sh
```
執行指令碼。