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Dockerfile
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# https://spring.io/guides/gs/spring-boot-docker/
# build the jar file to use
FROM eclipse-temurin:17-alpine
RUN apk update && apk upgrade && \
apk add --no-cache git
COPY . /javadocky/
RUN cd /javadocky && ./gradlew assemble --no-daemon
FROM eclipse-temurin:16-alpine as jlink
RUN jlink \
--add-modules java.base,java.desktop,java.management,java.xml,java.naming,java.net.http,java.sql,java.instrument \
--strip-java-debug-attributes \
--compress 2 \
--no-header-files \
--no-man-pages \
--output /jlink
FROM alpine:3.14
ENV LANG='en_US.UTF-8' LANGUAGE='en_US:en' LC_ALL='en_US.UTF-8'
ENV JAVA_HOME=/opt/jre
ENV PATH=${PATH}:${JAVA_HOME}/bin
# copied from https://github.com/AdoptOpenJDK/openjdk-docker/blob/master/15/jdk/alpine/Dockerfile.hotspot.releases.slim
RUN apk add --no-cache tzdata --virtual .build-deps curl binutils zstd \
&& GLIBC_VER="2.31-r0" \
&& ALPINE_GLIBC_REPO="https://github.com/sgerrand/alpine-pkg-glibc/releases/download" \
&& GCC_LIBS_URL="https://archive.archlinux.org/packages/g/gcc-libs/gcc-libs-10.1.0-2-x86_64.pkg.tar.zst" \
&& GCC_LIBS_SHA256="f80320a03ff73e82271064e4f684cd58d7dbdb07aa06a2c4eea8e0f3c507c45c" \
&& ZLIB_URL="https://archive.archlinux.org/packages/z/zlib/zlib-1%3A1.2.11-3-x86_64.pkg.tar.xz" \
&& ZLIB_SHA256=17aede0b9f8baa789c5aa3f358fbf8c68a5f1228c5e6cba1a5dd34102ef4d4e5 \
&& curl -LfsS https://alpine-pkgs.sgerrand.com/sgerrand.rsa.pub -o /etc/apk/keys/sgerrand.rsa.pub \
&& SGERRAND_RSA_SHA256="823b54589c93b02497f1ba4dc622eaef9c813e6b0f0ebbb2f771e32adf9f4ef2" \
&& echo "${SGERRAND_RSA_SHA256} */etc/apk/keys/sgerrand.rsa.pub" | sha256sum -c - \
&& curl -LfsS ${ALPINE_GLIBC_REPO}/${GLIBC_VER}/glibc-${GLIBC_VER}.apk > /tmp/glibc-${GLIBC_VER}.apk \
&& apk add --no-cache /tmp/glibc-${GLIBC_VER}.apk \
&& curl -LfsS ${ALPINE_GLIBC_REPO}/${GLIBC_VER}/glibc-bin-${GLIBC_VER}.apk > /tmp/glibc-bin-${GLIBC_VER}.apk \
&& apk add --no-cache /tmp/glibc-bin-${GLIBC_VER}.apk \
&& curl -Ls ${ALPINE_GLIBC_REPO}/${GLIBC_VER}/glibc-i18n-${GLIBC_VER}.apk > /tmp/glibc-i18n-${GLIBC_VER}.apk \
&& apk add --no-cache /tmp/glibc-i18n-${GLIBC_VER}.apk \
&& /usr/glibc-compat/bin/localedef --force --inputfile POSIX --charmap UTF-8 "$LANG" || true \
&& echo "export LANG=$LANG" > /etc/profile.d/locale.sh \
&& curl -LfsS ${GCC_LIBS_URL} -o /tmp/gcc-libs.tar.zst \
&& echo "${GCC_LIBS_SHA256} */tmp/gcc-libs.tar.zst" | sha256sum -c - \
&& mkdir /tmp/gcc \
&& zstd -d /tmp/gcc-libs.tar.zst --output-dir-flat /tmp \
&& tar -xf /tmp/gcc-libs.tar -C /tmp/gcc \
&& mv /tmp/gcc/usr/lib/libgcc* /tmp/gcc/usr/lib/libstdc++* /usr/glibc-compat/lib \
&& strip /usr/glibc-compat/lib/libgcc_s.so.* /usr/glibc-compat/lib/libstdc++.so* \
&& curl -LfsS ${ZLIB_URL} -o /tmp/libz.tar.xz \
&& echo "${ZLIB_SHA256} */tmp/libz.tar.xz" | sha256sum -c - \
&& mkdir /tmp/libz \
&& tar -xf /tmp/libz.tar.xz -C /tmp/libz \
&& mv /tmp/libz/usr/lib/libz.so* /usr/glibc-compat/lib \
&& apk del --purge .build-deps glibc-i18n \
&& rm -rf /tmp/*.apk /tmp/gcc /tmp/gcc-libs.tar* /tmp/libz /tmp/libz.tar.xz /var/cache/apk/*
RUN addgroup user && adduser -D -G user -h /home/user -s /bin/bash user && mkdir /home/user/.javadocky && chown -R user:user /home/user/.javadocky
WORKDIR /javadocky
USER user
VOLUME /javadocky/.javadocky
# for New Relic
ENV NEW_RELIC_APP_NAME="javadocky"
ENV NEW_RELIC_LOG_FILE_NAME="STDOUT"
RUN cd /home/user/.javadocky && \
wget https://download.newrelic.com/newrelic/java-agent/newrelic-agent/current/newrelic-java.zip && \
unzip newrelic-java.zip && rm newrelic-java.zip
COPY --from=0 /javadocky/build/libs/javadocky-*.jar /javadocky/javadocky.jar
COPY --from=1 /jlink $JAVA_HOME
ENTRYPOINT [ "sh", "-c", "java -Djava.security.egd=file:/dev/./urandom -javaagent:/home/user/.javadocky/newrelic/newrelic.jar -jar /javadocky/javadocky.jar" ]