KMS ARNs and SecretManager ARNs append unique-ids or some sort of hashes to the end of the ARN. To create a data lake for example. First, we need to ensure that the original account will allow the new account to perform the action of assuming a role. After thinking about this for a while, I realised that we can always import the bucket. entity to the bucket. Why do some images depict the same constellations differently? This action configures AWS credentials and Region environment variables for use in the GitHub Actions workflow. Upon installing AWS CDK, we can do a quick test using the. How can I reference a resource from other region in AWS CDK? In this example, the Queue Construct creates a single AWS::SQS::Queue resource. The CDK will generate a name for the export (as they have to be unique in a given AWS account-region combination) in the producing Stack, and then use that same name in the consuming Stack in the Fn::ImportValue expression. We will use Projen to create and manage our project. Re-running projen regenerates the files for you. Cross-account AWS resource access with AWS CDK. Create resources conditionally with CDK - Loige The custom resource After this, we can go on to the CDK part of the new account. Here we are using cdk.Fn.conditionEquals to indicate that the condition will be true if shouldCreateBucket matches the string 'true'. A few resources in AWS, such as Amazon S3 buckets and IAM roles, also have a resource To create an instance of a resource using its corresponding construct, pass in the scope as the first argument, the logical ID of the construct, and a set of configuration properties (props). The legacy way is still the default and creates just an S3 bucket into which assets are published when deploying, but the new way creates some additional resources, such as an ECR repository (for storing Docker images that are the result of building Docker assets) and IAM roles which may be assumed by CDK when synthesizing and deploying resources. The IAM module provides you with the tools you need to use these 2023, Amazon Web Services, Inc. or its affiliates. You implement the creation, update, and deletion logic to define the custom resource deployment. To go back to the intial request, I think the best way is to provide a native solution to retrieve these outputs/references between Cross Account Stacks directly. Repeat this step to add two more secrets: Check out the code from the repo, for which we use a standard Git action, Install your prerequisites. its name. Throughout this article, we will discuss these concepts with a practical example: creating or importing an S3 bucket based on the value of an SSM parameter. Custom Resources allow you to write custom logic in your CloudFormation deployment. available, but currently provides the same functionality as to the role's default policy; if it has none, one is created. If you use AWS IAM Identity Center (successor to AWS Single Sign-On) to authenticate as a user, then the single sign-on provider supplies Yes you could just use any value for physical name. Permissions PDF RSS The basic flow that the AWS CDK CLI takes when obtaining credentials is as follows: In this walkthrough, you use the cdk-assume-role-credential plugin to read information from multiple AWS accounts as part of the synthesis process. I recently needed to do that and finding a viable solution for this problem took me longer than I originally anticipated. Make sure that you use secrets to store your sensitive workflow configurations, as specified in the section Configuring secrets. For example, to cover that we use a resolver doing a simple describe (example) : So, in the code we just have to put the Arn of the Role to assume on the Account A, the Name of the Stack & the Cfn Output; like that : {{AppRoleArn}}:::{{AppPath}}/sns/topic-AutoScaling:::Arn. Best practices for sharing resources between multiple AWS cdks? I am still learning many of the CDK nuances, so Id appreciate any feedback. the infrastructure we wish to actually deploy to the other accounts). For more information about referencing secrets in the workflow, see Creating and storing encrypted secrets. In case you want to deploy 2 different resources within the same stack to 2 different accounts, this is not supported yet. The following code creates a new role, trusting the Amazon EC2 CloudFormation will assume the powerful execution roles that were defined when bootstrapping. Can you gave us an update about that Feature Request ? In the next section, you check in the code provided by the post to deploy a Lambda-based API CDK stack into this repo. The AWS Cloud Development Kit (AWS CDK) is an open-source software development framework to model and provision your cloud application resources using familiar programming languages. The method does nothing if the construct is an external resource, and it calls the Yes, this is possible. The workflow has four steps: You can check in the code into the master branch of your repo. The AWS Cloud Development Kit (AWS CDK) is an open-source software development framework to model and provision your cloud application resources using familiar programming languages. I hope you will find this useful and please let me know if you end up implementing something like this. In AWS CDK Custom Resources this is the Provider class that uses a Lambda event handler to carry out the create, update and delete operations. Semantics of the `:` (colon) function in Bash when used in a pipe? The way to solve this problem is to use the concept of condition in CloudFormation. from s3.Bucket to s3.CfnBucket) attach the condition to the lower level construct using cfnResource . Citing my unpublished master's thesis in the article that builds on top of it. First story of aliens pretending to be humans especially a "human" family (like Coneheads) that is trying to fit in, maybe for a long time? maintenance on June 1, 2022 and will now receive only critical bug fixes and security patches. What is the difference then? In order to execute the lookup, the user running CDK synth requires AWS credentials and these credentials need to be scoped to the target account. That example uses CDK to create a stack which defines the role which is given an AWS managed policy called ReadOnlyAccess. I try to merge from Sceptre (Troposphere) to CDK but I have to admit that actually CDK can't cover & offer a full alternative. It is not a templating tool, where the generated templates then immediately start to rot. Making statements based on opinion; back them up with references or personal experience. which you couldn't easily guess. $ git clone https://github.com/aws-samples/cdk-assume-role-credential-plugin.git, $ npm install -g git+https://github.com/aws-samples/cdk-assume-role-credential-plugin.git. Is there a reliable way to check if a trigger being fired was the result of a DML action from another *specific* trigger? It'll be a must have to be able to retrieve Stacks outputs from Cloudformation cross-accounts natively with CDK. Record the secret to use later. Built with Gatsby, Coffee and a lot of .css-12awzcx{color:#d26ac2;}.css-12awzcx:hover{color:red;}. @Cloudrage you should be able to simply reference loadBalancerDnsName in the consuming stack and if everything works as expected, the ALB will get a physical name, a dependency will be created between the stacks and the DNS name will be hard-coded in the consuming side. User.fromUserArn(). All rights reserved. methods. If the resource is created outside the context of CDK (like via console), then you might as well hardcode the names/arns/etc. You can schedule the trigger based on the cron settings or trigger it upon code pushed to a specific branch in the repo. But CreateGrant need the Key Arn & it's not possible to bypass that. Sometimes permissions must be applied while your stack is being deployed. Support for CDK v1 will end entirely on June 1, 2023. Well occasionally send you account related emails. Modify your cross-account IAM role's trust policy to allow your Lambda function to assume the role. That was quite easy! An example might be where you are compiling some Lambdas (Rust or GoLang, perhaps) and you then want to use those compiled binaries in a CDK deployment. The bootstrap will create several roles that can be used to deploy, manage assets and look up resource Amazon Resource Names (ARNs). Instead of trying to work all that out, it would be best left untouched and let CFn generate whatever random name/arn it chooses. This interface represents entities that can be granted permissions. How to correctly use LazySubsets from Wolfram's Lazy package? GitHub Actions is a feature on GitHubs popular development platform that helps you automate your software development workflows in the same place you store code and collaborate on pull requests and issues. How to deploy public ACM certificates across multiple AWS accounts and New features will be developed for CDK v2 exclusively. time. SSM doesn't have resource based policy that I know of. Well, the first (and for us most important) difference is, not all resources do support a resource-based policy. An example of creating a static website using AWS CDK and Java, --cloudformation-execution-policies arn:aws:iam::aws:policy/AdministratorAccess aws://, 'cdk-assume-role-credential-plugin@^1.2.1', 'arn:aws:iam::*:role/cdk-hnb659fds-deploy-role-*', 'arn:aws:iam::*:role/cdk-hnb659fds-file-publishing-*', 'yarn --cwd pipeline install --frozen-lockfile && yarn --cwd pipeline projen', 'npm install -g aws-cdk cdk-assume-role-credential-plugin', // add whatever build command you want here, 'pushd infra && cdk deploy --app cdk.out/ --require-approval never "*" && popd', // some log group - name it as you see fit and retain the logs for as long as needed, // define where our CI/CD environment will run, // note that we add a normal CodeBuild stage here, but we can use addApplicationStage if we just want to build and deploy a pure CDK application, // we can pass different build artifacts to the latter stages if we wish, there's not always a need to pass the entire source code, // some CDK dependencies here, whatever you need for your project, cdk deploy --profile my-profile-allowing-context-lookups-and-deployments, 'yarn --cwd pipeline run build --debug -v -v -v', 'yarn --cwd infra run build --debug -v -v -v', cdk-assume-role-credential-plugin repository on GitHub. members) write access to an Amazon RDS table. Permissions - AWS Cloud Development Kit (AWS CDK) v2 The entity doesn't have to know exactly which Amazon S3 IAM permissions are Usage: Do you mind creating us a bug for it in the main CDK repo? cf-GitActionDeploymentUserStack creates the IAM user with permission to assume git-action-cross-account-role (which you create in the next step). Now simply use these. I've tested that workaround (with & without PhysicalName.GENERATE_IF_NEEDED) but it seems that I've made something wrong : The initial deployment of our pipeline needs to be done with credentials that permit the user to deploy the pipeline to the CI/CD account: This onetime call to CDK deploy is something that you will need to riff on: its highly dependent on the permissions you have defined within your CI/CD account. In this post, we show you how to use GitHub Actions to deploy an AWS Lambda-based API to an AWS account and Region using the cross-account deployment strategy. Familiarity with running AWS commands from the AWS CLI. resource in one account (or a stage in CDK) referenced by other stages. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. can use that IAM object in your AWS CDK app. Create project directory # Create an empty directory on your system: mkdir cdk-workshop && cd cdk-workshop cdk init # We will use cdk init to create a new C# CDK project: cdk init sample-app --language csharp Output should look like this (you can safely ignore warnings about initialization of a git repository, this probably means you don't have git installed, which is fine for this workshop . 1 Answer Sorted by: 1 By utilizing the fromArn functions where they are available. We accept as input some artifact, which we will define later (well use the output from the source stage). The last stanza is important though, and doesnt appear fully in the docs. I think it's not an isolated pb, I've faced the same pb between VpcEndpointService & InterfaceVpcEndpoint. Create a native "resolver" and an assume role feature like the "cdk-assume-role-plugin" (ok that last point is another feature request :p) ! You signed in with another tab or window. In order to use CDK, we need to have bootstrapped the accounts and regions to which we want to deploy stuff. Advanced Custom Resources with AWS CDK - Medium And another thing, it's not possible to set the PhysicalName of our own ? Not the answer you're looking for? Cross-account and cross-region deployment using GitHub actions and AWS CDK They should be your private profiles and only be used during the course of this use case. What you dont see in the normal logs is the heavy lifting that is being done for you by cdk-assume-role-credential-plugin: for each stack, it will retrieve credentials if the standard ones wont suffice for the target accounts (111111111111 and 222222222222) by assuming the arn:aws:iam::*:role/cdk-hnb659fds-deploy-role-* and arn:aws:iam::*:role/cdk-hnb659fds-file-publishing-* roles in the target accounts to publish CDK assets as required then create and execute the changesets. The IAM roles provide Lambda functions with the permissions needed. Its really important you add these. Same for me, not found an easy and beautifful way to do that; again, the only workaround "viable" I've found is to use output-file. Connect and share knowledge within a single location that is structured and easy to search. We will get those fixed. Clone the GitHub repo aws-cross-account-cicd-git-actions-prereq and navigate to folder tools-account. How you create this is up to you: there is an example inside the cdk-assume-role-credential-plugin repository on GitHub, look for the required-resources.ts files. To decouple services on AWS, it's a common pattern to use Amazon SQS and Amazon SNS.With AWS Key Management Service, you can encrypt the messages stored in the SNS topic and SQS queue.For the AWS Cloud Development Kit using TypeScript, you can easily create an architecture for secure message processing.. Resources. starting with grant. Cross-stack references only apply within the same region. Also note that we set a context value: this will be added to the cdk.json file when we run projen. We're sorry we let you down. As the architecture for your application becomes more complex, so too can your release pipelines. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. you need to pass environment config object to stack props. using an environment variable or a value in the CDK context) then things are easy and we should be able to do something like this: But what if we try to replace our expression (process.env['CREATE_BUCKET'] === 'true') with something that depends on other resources on our AWS account? Since we are working with CDK, we can use the concept of condition with the low level CfnCondition construct. 1 Answer Sorted by: 2 Yes, this is possible. The older CDK v1 entered Change of equilibrium constant with respect to temperature. Let the construct create a new role for you, trusting the appropriate service Not sure to understand how PhysicalName.GENERATE_IF_NEEDED works. Workflows are custom automated processes that you can set up in your repository to build, test, package, release, or deploy any code project on GitHub. https://aws.amazon.com/premiumsupport/knowledge-center/lambda-function-assume-iam-role/, https://docs.aws.amazon.com/IAM/latest/UserGuide/tutorial_cross-account-with-roles.html, https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_compare-resource-policies.html, https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_identity-vs-resource.html, https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html, https://jayendrapatil.com/aws-iam-roles-vs-resource-based-policies/, https://stackoverflow.com/questions/60310575/how-to-add-s3-bucketpolicy-with-aws-cdk, https://aws.amazon.com/blogs/security/iam-share-aws-resources-groups-aws-accounts-aws-organizations/. Deployment is carried out by these pipelines across other AWS accounts, which may correspond to dev, staging, or prod. Would be better if i could use CDK to add the records in TypeScript. The synthesize command tells CDK to . The AWS Construct Library uses a few common, widely implemented idioms to manage access In the course of doing this, the actor will assume one or more IAM Identities An example might be to query Route53 HostedZone details by way of HostedZone.fromLookup(), for instance. If you are automatically creating accounts into which you wish your CI/CD account to be able to deploy, youll probably create these roles at this point right after creating the account. The IAM user in the tools account can assume this role and perform the following tasks: AWS CDK passes git-action-cf-execution-role to AWS CloudFormation to create, update, and delete the CloudFormation stack. In this article I will try to summarise what I learned and present my solution. Hosted on GitHub, accelerated by Cloudflare. Maybe there are other ways to achieve the same results. Amazon DynamoDB table, has methods that grant access to another entity. Did you ever need to create a resource based on a condition in CDK? (A number of AWS services do this to make sure that you didn't forget to set the You can turn on additional logging by mutating your pipeline (just make the changes, then push: the pipeline will take care of rebuilding itself) to add logging to either the pipeline or infra project buildscripts (or both): Youll now have pretty verbose logs which should assist with tracking down any issues. AWS: Encrypted SQS with SNS Subscription using KMS GitHub Actions automatically identifies the workflow in this location and triggers it if conditions match. how to grant a CodeBuild project access to an Amazon S3 bucket. We will use a CDK plugin called cdk-assume-role-credential-plugin to retrieve credentials for us, but we need to tell this plugin what role to assume when retrieving STS credentials by way of sts:AssumeRole. The second use case is an extension of the first one: The assumed role may have permissions to create, update and delete resources in a third AWS account. Well assume that you have 2 accounts into which you would like to deploy some infrastructure, where that infrastructure has been defined using CDK. Name of the Stack ? For the purposes of this example, we will assume a role called cdk-readOnlyRole exists in each of our 2 target accounts, where those accounts trust our CI/CD account, i.e. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How to skip DynamoDB Table creation if already exists #6762 - GitHub Hey CDK, how can I reference existing resources? We can take a detailed look at the code base. In this case, many times you wouldn't "know" the exact ARNs as the physical-id would be generated by CloudFormation and likely be a part of the ARN. Thanks! The cf-CrossAccountRolesStack creates the two IAM roles we discussed at the beginning of this step. The workflow then assumes the cross-account role and initiates deployment. The app is defined in app.ts under the repo root folder location. But otherwise feel free to just assign any name. For users, call User.fromUserArn() or User.fromUserName(). Because we trust the new account fully, we will use 22222:root as principal. Create a native "resolver" and an assume role feature like the "cdk-assume-role-plugin" (ok that last point is another feature request :p) ! Policies (including managed policies) can be used in similar fashion using the following Finally, we define the Git Actions workflow under the .github/workflows/ folder per the specifications defined by GitHub Actions. You can choose the workflow link and monitor the log for each individual step of the workflow. Finding it hard to pass the values needed for the NS records and zoneId. AWS Cloud Development Kit (AWS CDK) is a powerful tool that allows developers to define cloud infrastructure in code using familiar programming languages like TypeScript, Python, and Java. Then we will see how to attach condition to low level construct. To then reference these constructs/ARNs, just put them into SSM Parameters in the source/central account. object has numerous GitHub Actions uses the tools account IAM user credentials to the assume the cross-account role to carry out deployment. Other entities can also be granted permissions. Once done, there is no more maintenance - each time you add new environments/accounts to CDK (assuming its a cdk pipeline here), the "loop" construct that you will create will automatically add the new account into the trust relationship. Each job runs on a virtual machine called a runner, which can either be GitHub-hosted or self-hosted. Can someone please give some pointers? Group. To learn more, see our tips on writing great answers. You can invoke your API by choosing this URL on the browser. If a method like this is not available for the resouce you want to reference, then it's not possible to reference it in CDK. application that can call AWS APIs. So far, if we deployed this pipeline, it would build and redeploy itself and whilst this is cool, its not that useful, so lets add another stage where we actually do some work. However, not Hi @eladb ! For example, if you create an IAM group, you can grant the group (and thus its You need to create resources in Amazon SQS, Amazon SNS, AWS Key Management . Thanks for contributing an answer to Stack Overflow! The proposed solution (illustrated in Figure 1), deploys AWS CloudFormation stack sets to create necessary resources like AWS Identity and Access Management roles and Lambda functions in AWS accounts. Cross-account AWS resource access with AWS CDK - Luminis The AWS Construct Library supports specifying Is it possible to deploy resources to two different AWS accounts using CDK? Assuming that the build of the pipeline completes, successfully, our pipeline will becomes self aware and even if the latter stages fail, whenever we push changes to our Git repository, our pipeline will rebuild, redeploy itself, then perform whatever build stages we have defined, which for our example, is the deployment of more CDK infrastructure. This would require crafting IAM permissions in the final AWS account to allow an intermediate AWS account to create, update and delete resources in the final AWS account. Why is Bb8 better than Bc7 in this position? The CDK script will change slightly, but still is easy configurable as long as you are managing your accounts correctly by Organizations: All accounts under this organizationId will get the access you just defined. This allow us to evaluate the expression at deployment time when the actual value of the SSM parameter will be available, therefore this condition will work as intended. Based in our condition, one of two things can happen: In both cases, if we know the unique name of the bucket, we can import it using s3.Bucket.fromBucketAttributes: The code above will give us a valid reference to the bucket in both cases. To synthesize the application, complete the following steps: $ cdk synth -app "npx ts-node bin/sample-app.ts". For resources that don't have resource based policies, like SSM for eg., things are a bit roundabout as you will need to create a Role that can be assumed cross-account and then access the resource. Lets start with a practical example: we want to define a stack using CDK and we need to be able to import or create an S3 bucket depending on a specific condition. Scroll down to Resource-based policy and then choose View policy document. To learn more, see our tips on writing great answers. Our workflow .yml file is named in the format cicd-workflow-
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