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How to use this Image
You can pull and test the image with the following commands:
docker pull sapmachine:latest
docker run -it sapmachine:latest java -version
You can also use the SapMachine image as a base image to run your own jar file:
FROM sapmachine:latest
RUNmkdir /opt/myappCOPY myapp.jar /opt/myappCMD ["java", "-jar", "/opt/myapp/myapp.jar"]
You can then build and run your own Docker image:
docker build -t myapp .
docker run -it --rm myapp
Image Variants
The sapmachine images come in many flavors, each designed for a specific use case.
sapmachine:<version>
This is the defacto image. If you are unsure about what your needs are, you probably want to use this one. It is designed to be used both as a throw away container (mount your source code and start the container to start your app), as well as the base to build other images off of.
Some of these tags may have names like focal, jammy, or noble in them. These are the suite code names for releases of Ubuntu and indicate which release the image is based on. If your image needs to install any additional packages beyond what comes with the image, you'll likely want to specify one of these explicitly to minimize breakage when there are new releases of Ubuntu.
sapmachine:<version>-alpine
This image is based on the popular Alpine Linux project, available in the alpine official image. Alpine Linux is much smaller than most distribution base images (~5MB), and thus leads to much slimmer images in general.
This variant is useful when final image size being as small as possible is your primary concern. The main caveat to note is that it does use musl libc instead of glibc and friends, so software will often run into issues depending on the depth of their libc requirements/assumptions. See this Hacker News comment thread for more discussion of the issues that might arise and some pro/con comparisons of using Alpine-based images.
To minimize image size, it's uncommon for additional related tools (such as git or bash) to be included in Alpine-based images. Using this image as a base, add the things you need in your own Dockerfile (see the alpine image description for examples of how to install packages if you are unfamiliar).
License
The Dockerfiles and associated scripts are licensed under the Apache License 2.0.
Licenses for the SapMachine product installed within the images:
As with all Docker images, these likely also contain other software which may be under other 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.
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