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BUILD.md

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Building Heroku Base Images Locally

Prepare your local environment

The build scripts in this repository require:

Build

To build the base images locally, run this from the repo root:

bin/build.sh STACK_VERSION

For example:

./bin/build.sh 24

Adding packages to the base image

Add the package you want to the appropriate setup.sh for example heroku-24/setup.sh:

+    libc6-dev

Once done, run bin/build.sh locally to generate the corresponding installed-packages* files. Multi-arch base images (heroku-24 and beyond) will produce an installed-packages-$ARCH.txt for each architecture, while single architecture images will produce a singular installed-packages.txt.

The *-build variants include all the packages from the non-build variant by default. This means that if you're adding a package to both, you only need to add them to the non-build variant. The example above will add libc6-dev to both heroku-24 and heroku-24-build.

The *cnb* variants (which only exist for heroku-22 and prior) inherit the installed packages from the non-*cnb* variant. Add packages to a non-*cnb* variant to add them to the *cnb* variant.

Releasing Heroku Base Images

We use GitHub Actions to build and release Heroku Base Images:

  • Any push to main will build the images and push the nightly Docker tag variants (such as heroku/heroku:24-build.nightly).
  • Any new Git tag will build the image and push the latest Docker tag (such as heroku/heroku:24-build), as well as a versioned tag (such as heroku/heroku:24-build.v123). The arm64 images will then also be converted to a Heroku-specific .img format and uploaded to S3 for consumption by the runtime hosts.

Generating .img format Base Images locally

To test the generation of the Heroku-specific, amd64-only .img file:

  1. Build the Docker images for your chosen stack as normal above.
  2. docker build --platform=linux/amd64 ./tools -t heroku-image-tools
  3. docker run -it --rm --platform=linux/amd64 --privileged -v /var/run/docker.sock:/var/run/docker.sock heroku-image-tools STACK_VERSION (where STACK_VERSION is a integer version like 24)