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upsert-slr

v1.0.6

Published

Manage AWS service-linked roles in a better way.

Downloads

5,046

Readme

Upsert Service-Linked Role

AWS CDK construct to create a service-linked role (SLR) if there is no SLR for the same service, and if there is, skip the creation process.

architecture

Features

  • Create a service-linked role. If it is already created in the same AWS account, just skip the creation.
  • Standalone CFn template since no CDK assets are used. We use inline code for the Lambda function.
  • Sleep some time after role creation to wait for IAM propagation.

Usage

npm install upsert-slr
import { ServiceLinkedRole } from 'upsert-slr';

new ServiceLinkedRole(this, 'ElasticsearchSlr', {
    awsServiceName: 'es.amazonaws.com',
    description: 'Service linked role for Elasticsearch',
});

Why do we need this?

CloudFormation also supports a service-linked role (doc). Why do we need this?

Because the resource behaves strangely when there is already a role with the same name. All we need is to simply create a role, and skip it if it already exists. Such behavior as upsert is achieved by this construct, upsert-slr.

Also, even if CFn successfully creates a role, resources that depend on the role sometimes fail to be created because there is sometimes a delay before the role is actually available. See this stack overflow for more details.

To avoid the IAM propagation delay, this construct also waits for some time after a role is created.