$ show corretto/corretto-docker
This repository contains the official Dockerfiles and automation tooling for building and publishing Amazon Corretto Docker images across multiple versions (8, 11, 17, 21, 25, 26, 27) and base operating systems (Amazon Linux 2, Amazon Linux 2023, Alpine, Debian). The codebase does not contain a running application but instead acts as a build configuration and CI/CD orchestration layer. The Dockerfiles are meticulously crafted: they verify package signatures via RPM or APT keys, install dependencies (e.g., fontconfig), clean temporary files, and set environment variables. Notable 'slim' variants use `jlink` to produce smaller runtime images by stripping debug symbols, man pages, and header files—a non-obvious optimization. The repository also includes Python scripts (`bin/apply-template.py`, `bin/tag-generator.py`) and shell scripts (`bin/update-dockerfiles.sh`, `bin/test-image.sh`) that automate Dockerfile generation, version propagation, and image validation via container-structure-test. CI/CD is implemented in GitHub Actions and validates images for every push/PR. The repository is the authoritative source for the official amazoncorretto Docker images on Docker Hub and ECR, and its primary purpose is to produce reproducible, secure JDK containers.
The LLM identified 3 files worth highlighting for reuse:
Demonstrates a pattern for creating a slim JDK image using `jlink` to produce a custom runtime that excludes man pages, header files, and debug symbols, saving ~113MB. The pattern is reusable across any JDK version and base image: install full JDK + binutils, run jlink with all modules, then remove the full JDK and binutils, leaving only the minimal runtime. This is a non-trivial optimization that can be applied to any project wanting smaller Java container images.
A Jinja2 template that generates Dockerfiles for multiple Corretto versions and Alpine variants. Uses conditional logic for JRE vs JDK and sets OS_VERSION. This approach decouples version-specific parameters from the Dockerfile structure, making it trivial to add new base OS versions or Corretto releases. The template is reusable for any project that needs to maintain a matrix of Dockerfiles with shared logic.
A shell script that integrates Google's container-structure-test tool into the build pipeline. It fetches the appropriate binary for the host OS, builds the Docker image from a given Dockerfile, derives the Corretto version and install type from the file path, and runs predefined test suites. This pattern is self-contained: any project building Docker images can reuse this script to automate structural testing with minimal modification.