docker-clojure

by Quantisan

Quantisan / docker-clojure

Official Docker image for Clojure

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docker-clojure

This is the repository for the official Docker image for Clojure. It is automatically pulled and built by Stackbrew into the Docker registry. This image runs on OpenJDK 8, 11, 14, 15, and 16 and includes Leiningen, boot, and/or tools-deps (see below for tags and building instructions).

Leiningen vs. boot vs. tools-deps

The version tags on these images look like

(openjdk-major-version-)lein-N.N.N(-distro)
,
(openjdk-major-version-)boot-N.N.N(-distro)
, and
(openjdk-major-version-)tools-deps(-distro)
. These refer to which version of leiningen, boot, or tools-deps is packaged in the image (because they can then install and use any version of Clojure at runtime). The
lein
(or
lein-slim-buster
,
openjdk-14-lein
, etc.) images will always have a recent version of leiningen installed. If you want boot, specify either
clojure:boot
,
clojure:boot-slim-buster
, or
clojure:boot-N.N.N
,
clojure:boot-N.N.N-slim-buster
,
clojure:openjdk-14-boot-N.N.N-slim-buster
, etc. (where
N.N.N
is the version of boot you want installed). If you want to use tools-deps, specify either
clojure:tools-deps
,
clojure:tools-deps-slim-buster
or other similar variants.

Note about the latest tag

As of 2020-3-20 the

clojure:latest
(also
clojure
because
latest
is the default) now has leiningen, boot, and tools-deps installed.

Previously this tag only had leiningen installed. Installing the others is helpful for quick start examples, newcomers, etc. as leiningen is by no means the de facto standard build tool these days. The downside is that the image is larger. But for the

latest
tag it's a good trade off because for anything real we have always recommended using more specific tags. No other tags are affected by this change.

JDK versions

Java has recently introduced a new release cadence of every 6 months and dropped the leading

1
major version number. As of 2019-9-25, our images will default to the latest LTS release of OpenJDK (currently 11). But we also now provide the ability to specify which version of Java you'd like via Docker tags:

JDK 1.8 tools-deps image:

clojure:openjdk-8-tools-deps
JDK 11 variant of that image:
clojure:openjdk-11-tools-deps
or
clojure:tool-deps
JDK 14 with the latest release of leiningen:
clojure:openjdk-14
JDK 15 with boot 2.8.3:
clojure:openjdk-15-boot-2.8.3

Linux distro

The upstream OpenJDK images are built on a few different variants of Debian Linux, so we have exposed those in our Docker tags as well. The default is now Debian slim-buster. But you can also specify which distro you'd like by appending it to the end of your Docker tag as in the following examples (but note that not every combination is provided upstream and thus likewise for us):

JDK 1.8 leiningen on Debian slim-buster:

clojure:openjdk-8
or
clojure:openjdk-8-lein
or
clojure:openjdk-8-lein-stretch
JDK 1.8 leiningen on Debian buster:
clojure:openjdk-8-buster
or
clojure:openjdk-8-lein-buster
JDK 11 tools-deps on Debian slim-buster:
clojure:tools-deps
or
clojure:openjdk-11-tools-deps
or
clojure:openjdk-11-tools-deps-slim-buster
JDK 15 tools-deps on Alpine:
clojure:openjdk-15-tools-deps-alpine

Alpine Linux

Most of the upstream alpine-based openjdk builds have been deprecated, so we have followed suit. As of 2020-8-14 we provide an alpine variant for OpenJDK 16 builds, but that's it. And it is likely that that build will go away once OpenJDK 17 is released (as has happened with other recent releases).

For other versions of OpenJDK, we recommend migrating to the

slim-buster
variant instead. The older
alpine
images won't go away, but neither will they receive security updates, version bumps, etc. We recommend that you cease using them until / unless official upstream support resumes.

clojure:slim-buster

These images are based on the Debian buster distribution but have fewer packages installed and are thus much smaller than the

stretch
or
buster
images. Their use is recommended.

Examples

Interactive Shell

Run an interactive shell from this image.

docker run -i -t clojure /bin/bash

Then within the shell, create a new Leiningen project and start a Clojure REPL.

lein new hello-world
cd hello-world
lein repl

Builds

The Dockerfiles are generated by the

docker-clojure
Clojure app in this repo.

You'll need the

tools-deps
distribution of Clojure installed to run the build. Often this just means installing the
clojure
package for your system.

The

./build-images.sh
script will generate the Dockerfiles and build all of the images.

Tests

The

docker-clojure
build tool has a test suite that can be run via the
./test.sh
script.

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