A debian-based Docker image bundling all the SDKs and tools required in order to package jsii projects in all supported languages.

View on Amazon ECR Public Gallery or Docker Hub.

Recommended image

We recommend the following image for most users. See Image tags for further details.

public.ecr.aws/jsii/superchain:1-bookworm-slim

Current image tags

The following image tags are actively maintained and updated regularly.

public.ecr.aws/jsii/superchain:<image-tag>

Image tag	Debian	Node	Python
1-trixie-slim	13 trixie	22	3.13
1-trixie-slim-node20	13 trixie	20	3.13
1-trixie-slim-node22	13 trixie	22	3.13
1-trixie-slim-node24	13 trixie	24	3.13
1-bookworm-slim	12 bookworm	22	3.11
1-bookworm-slim-node18	12 bookworm	18	3.11
1-bookworm-slim-node20	12 bookworm	20	3.11
1-bookworm-slim-node22	12 bookworm	22	3.11
1-bookworm-slim-node24	12 bookworm	24	3.11
1-bullseye-slim-node20	11 bullseye	20	3.9
1-bullseye-slim-node22	11 bullseye	22	3.9

Any other tags should be considered deprecated or in the case of nightly images experimental.

Image tags

Image tags are named using the following pattern:

public.ecr.aws/jsii/superchain:<JSII-MAJOR>-<BASE>(-node<NODE-MAJOR>)(-nightly)

• <JSII-MAJOR> is the major line of the jsii toolchain (currently only 1)
• <BASE> is the base image tag, currently supported base images are
• <NODE-MAJOR> is the major version of Node.js contained in the image
• -nightly images are released from the HEAD of the aws/jsii repository and should typically not be used for production workloads

Support policy

Generally only actively versions that are actively supported by upstream projects are maintained in superchain.

Debian

We only publish images for Debian releases under LTS (but not ELTS). All superchain images are based on the slim variant.

Node

We publish images variants for stable Node versions supported by the AWS CDK. Usually this means all even Node versions until six month after their EOL. We will only add new Node variants to the latest Debian release. We include the npm version that ships with the version of Node.

Python

The image includes the most recent Python version available for the respective Debian distribution. A complete list can be viewed on the Debian website.

Included Language SDKs

SDK	Version
OpenJDK 20	Amazon Corretto >= 20.0.2
.NET SDK	>= 6.0.14
mono	>= 6.12.0.200
Javascript	see Current image tags
PowerShell	pwsh >= 7.2.16
Python 3	see Current image tags
Go	go >= 1.25.0

Included Tools & Utilities

The following tools & utilities are available for your convenience. Versions are generally the latest available for the respective Debian distribution.

Tool / Utility	Version
aws	>= 2.11.17
bundler	>= 1.17.3 and >= 2.1.4
docker	>= 24.0.7-ce
git	>= 2.30.2
make	>= 4.3
maven	>= 6.4.15
openssl	>= 1.1.1w
rsync	>= 3.2.3
yarn	>= 1.22.19
zip & unzip	>= 6.0-19
gh	>= 1.13.1
sam	>= 1.102.0

Building

This docker image can be build locally:

docker build ./superchain -t jsii/superchain:local

In case the tests fail, skip the tests and inspect the image manually:

docker build ./superchain -t jsii/superchain:local --target=superchain

NodeJS and NPM

If you are building this image from source, you can control the Node version with the NODE_MAJOR_VERSION build argument:

docker build [...] --build-arg NODE_MAJOR_VERSION=22

Releasing

Changes are not automatically released. Instead a new preview images public.ecr.aws/jsii/superchain:1-bullseye-slim-nightly is released weekly.

A full release (the public.ecr.aws/jsii/superchain:1-bullseye-slim images) is done monthly, or whenever a new release is cut manually.

The latest release information (for both of the container image tags) can be seen on the Amazon ECR Public Gallery.

To manually kick-off a full or preview release, start the Tag Preview or Tag Release workflow respectively.

License

As with all Docker images, these also contain software which may be distributed under various licenses (such as Bash, etc from the base distribution, along with any direct or indirect dependencies of the primary software being contained).

As for any pre-built image usage, it is the image user's responsibility to ensure that any use of this image complies with any relevant licenses for all software contained within.

For more information, refer to the /NOTICE file that is present in the Docker image.

FAQ

Q: The docker build is failing because it cannot access proxy.golang.org, how do I fix this? A: By default, Go attempts to use a module proxy, which caches modules to accelerate downloads. However, some network configurations block this proxy. Run go env -w GOPROXY=direct to download from source.

Q: During docker image build, why do I see a warning like: "WARNING: Maven ${M2_VERSION} not found on downloads mirror, falling back to archive.apache.org"? A: This indicates that M2_VERSION has fallen behind the latest version of Maven. Update M2_VERSION to the latest version to address this. We first attempt to download the Maven version matching M2_VERSION from the regular distro: https://downloads.apache.org/maven/maven-3. However, when new versions are released, older versions are removed from that distro. We emit this warning and fall back to the archive link: https://archive.apache.org/dist/maven/maven-3.