OpenJDK and Docker

Dockerfiles and build scripts for generating various Docker Images related to OpenJDK. Currently this builds OpenJDK images with hotspot and Eclipse OpenJ9 on Ubuntu and Alpine Linux.

Supported Architectures

• Hotspot is supported on aarch64, ppc64le, s390x and x86_64.
• Eclipse OpenJ9 is supported on ppc64le, s390x and x86_64.

License

The Dockerfiles and associated scripts found in this project are licensed under the Apache License 2.0..

Supported builds and build types

1. There are two kinds of build images
   • Release build images
     • These are release tested versions of the JDKs.
     • Associated tags: latest, alpine, ${version}
   • Nightly build images
     • These are nightly builds with minimal testing.
     • Associated tags: nightly, alpine-nightly, ${version}-nightly
2. There are two build types
   • Full build images
     • This consists of the full JDK.
     • Associated tags: latest, alpine, ${version}
   • Slim build images
     • These are stripped down JDK builds that remove functionality not typically needed while running in a cloud.
     • Associated tags: slim, alpine-slim, ${version}-slim

Here is a listing of the image sizes for the various build images and types for JDK Version 8

VMs	latest	slim	nightly	nightly-slim	alpine	alpine-slim	alpine-nightly	alpine-nightly-slim
OpenJ9	339MB	251MB	344MB	250MB	208MB	120MB	213MB	118MB
Hotspot	324MB	238MB	324MB	238MB	193MB	106MB	193MB	106MB

Notes:

1. The alpine-slim images are about 60% smaller than the latest images.
2. The Alpine Linux and the slim images are not yet TCK certified.

Build and push the Images with multi-arch support

# Steps 1-2 needs to be run on all supported arches.
# i.e aarch64, ppc64le, s390x and x86_64.

# 1. Clone this github repo
     $ git clone https://github.com/AdoptOpenJDK/openjdk-docker

# 2. Build images and tag them appropriately
     $ cd openjdk-docker
     $ ./build_all.sh

# Steps 3 needs to be run only on x86_64

# 3. build_all.sh should be run on all supported architectures to build and push images to the
#    docker registry. The images should now be available on hub.docker.com but without multi-arch
#    support. To add multi-arch support, we need to generate the right manifest lists and push them
#    to hub.docker.com. The script generate_manifest_script.sh can be used to
#    generate the right manifest commands. This needs to be run only on x86_64 after docker images
#    for all architecures have been built and made available on hub.docker.com
     $ ./update_manifest_all.sh

# We should now have the proper manifest lists pushed to hub.docker.com to support multi-arch pulls.

Linting dockerfiles (via hadolint)

To lint generated dockerfiles run ./linter.sh - script will download hadolint binary and check all dockerfiles.

Info on other scripts

# Run generate_latest_sums.sh to get the shasums for the latest binaries on adoptopenjdk.net
  $ ./generate_latest_sums.sh $version

# You should now have two files, hotspot_shasums_latest.sh and openj9_shasums_latest.sh. These will
# have the shasums for the latest version for each of the supported arches for hotspot and
# Eclipse OpenJ9 respectively.

# You can now run update_multiarch.sh to generate the Dockerfiles for all supported arches for both
# hotspot and Eclipse OpenJ9.
  $ ./update_multiarch.sh $version

# build_latest.sh will do all of the above and build the docker images for the current arch with the
# right set of tags