cdk-assets

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The APIs of higher level constructs in this module are experimental and under active development. They are subject to non-backward compatible changes or removal in any future version. These are not subject to the Semantic Versioning model and breaking changes will be announced in the release notes. This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

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A tool for publishing CDK assets to AWS environments.

Overview

cdk-assets requires an asset manifest file called assets.json, in a CDK CloudAssembly (cdk.out/assets.json). It will take the assets listed in the manifest, prepare them as required and upload them to the locations indicated in the manifest.

Currently the following asset types are supported:

• Files and archives, uploaded to S3
• Docker Images, uploaded to ECR

S3 buckets and ECR repositories to upload to are expected to exist already.

We expect assets to be immutable, and we expect that immutability to be reflected both in the asset ID and in the destination location. This reflects itself in the following behaviors:

• If the indicated asset already exists in the given destination location, it will not be packaged and uploaded.
• If some locally cached artifact (depending on the asset type a file or an image in the local Docker cache) already exists named after the asset's ID, it will not be packaged, but will be uploaded directly to the destination location.

Usage

The cdk-asset tool can be used programmatically and via the CLI. Use programmatic access if you need more control over authentication than the default aws-sdk implementation allows.

Command-line use looks like this:

$ cdk-assets /path/to/cdk.out [ASSET:DEST] [ASSET] [:DEST] [...]

Credentials will be taken from the AWS_ACCESS_KEY... environment variables or the default profile (or another profile if AWS_PROFILE is set).

A subset of the assets and destinations can be uploaded by specifying their asset IDs or destination IDs.

Manifest Example

An asset manifest looks like this:

{
  "version": "1.22.0",
  "files": {
    "7aac5b80b050e7e4e168f84feffa5893": {
      "source": {
        "path": "some_directory",
        "packaging": "zip"
      },
      "destinations": {
        "us-east-1": {
          "region": "us-east-1",
          "assumeRoleArn": "arn:aws:iam::12345789012:role/my-account",
          "bucketName": "MyBucket",
          "objectKey": "7aac5b80b050e7e4e168f84feffa5893.zip"
        }
      }
    },
  },
  "dockerImages": {
    "b48783c58a86f7b8c68a4591c4f9be31": {
      "source": {
        "directory": "dockerdir",
      },
      "destinations": {
        "us-east-1": {
          "region": "us-east-1",
          "assumeRoleArn": "arn:aws:iam::12345789012:role/my-account",
          "repositoryName": "MyRepository",
          "imageTag": "b48783c58a86f7b8c68a4591c4f9be31",
          "imageUri": "123456789012.dkr.ecr.us-east-1.amazonaws.com/MyRepository:1234567891b48783c58a86f7b8c68a4591c4f9be31",
        }
      }
    }
  }
}

Placeholders

The destination block of an asset manifest may contain the following region and account placeholders:

• ${AWS::Region}
• ${AWS::AccountId}

These will be substituted with the region and account IDs currently configured on the AWS SDK (through environment variables or ~/.aws/... config files).

• The ${AWS::AccountId} placeholder will not be re-evaluated after performing the AssumeRole call.
• If ${AWS::Region} is used, it will principally be replaced with the value in the region key. If the default region is intended, leave the region key out of the manifest at all.