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Last active April 21, 2019 11:29
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Clojure tools.deps multi-stage Dockerfile setup to compile Clojure code inside Dockerfile
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Dockerfile
FROM clojure:openjdk-11-tools-deps-1.10.0.442 as builder
WORKDIR /app
# Install deps
COPY ./deps.edn ./
RUN clojure -Abuild -e "(clojure-version)"
# Compile Clojure code
ADD . /app
RUN clojure -Abuild
FROM openjdk:11.0.2-slim
COPY --from=builder /app/target/lib/lib /app/lib
COPY --from=builder /app/target/classes /app/classes
WORKDIR /app
CMD java $JAVA_OPTS -cp "classes:lib/*" our-app.core
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The builder stage tries to be smart about copying only the deps.edn file and executing a simple Clojure script (clojure-version) to get the dependencies. Only then does it copy over application files and start the actual build. This should help with caching.

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