CLojure dockerfile

Dockerfile

FROM clojure:openjdk-13-tools-deps-slim-buster as builder

WORKDIR /usr/src/app

# install cambada builder, as it will not change
RUN clj -Sdeps '{:deps {luchiniatwork/cambada {:mvn/version "1.0.0"}}}' -e :ok

# install main deps, sometimes change
COPY deps.edn /usr/src/app/deps.edn
RUN clj -e :ok

# add files and build, change often
COPY resources/ /usr/src/app/resources
COPY src/ /usr/src/app/src
RUN clj -A:uberjar

# use clean base image
FROM openjdk:13-slim-buster
# set static config
ENV PORT 8080
EXPOSE 8080
# set the command, with proper container support
CMD ["java","-XX:+UseContainerSupport","-XX:MaxRAMPercentage=85","-XX:+UnlockExperimentalVMOptions","-XX:+UseZGC","-jar","/usr/src/app/app.jar"]
# copy the ever changing artifact
COPY --from=builder /usr/src/app/target/app-1.0.0-SNAPSHOT-standalone.jar /usr/src/app/app.jar

Dockerfile.native

FROM clojure:openjdk-11-tools-deps as builder

WORKDIR /usr/src/app

RUN clj -Sdeps '{:deps {luchiniatwork/cambada {:mvn/version "1.0.0"}}}' -e :ok 

COPY deps.edn /usr/src/app/deps.edn
RUN clj -e :ok

COPY resources/ /usr/src/app/resources
COPY src/ /usr/src/app/src

RUN clj -A:uberjar# the native-image tool
FROM oracle/graalvm-ce:19.3.1-java11 as native

RUN gu install native-image

WORKDIR /usr/src/app

COPY --from=builder /usr/src/app/target/app-1.0.0-SNAPSHOT-standalone.jar /usr/src/app/app.jar# lots of specific flags
RUN native-image --allow-incomplete-classpath --static --enable-http --no-fallback  --no-server --initialize-at-build-time --report-unsupported-elements-at-runtime  --initialize-at-run-time=io.netty.channel.epoll.EpollEventArray,io.netty.channel.unix.Errors,io.netty.channel.unix.IovArray,io.netty.channel.unix.Socket,io.netty.channel.epoll.Native,io.netty.channel.epoll.EpollEventLoop,io.netty.util.internal.logging.Log4JLogger -jar app.jar app

# use clean image
FROM scratch

COPY --from=native /usr/src/app/app /app

CMD ["/app"]