Dockerfile

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FROM openjdk:8-jre

# Install dependencies
RUN set -ex; \
  apt-get update; \
  apt-get -y install libsnappy1v5; \
  rm -rf /var/lib/apt/lists/*

# Grab gosu for easy step-down from root
ENV GOSU_VERSION 1.7
RUN set -ex; \
  wget -nv -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture)"; \
  wget -nv -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture).asc"; \
  export GNUPGHOME="$(mktemp -d)"; \
  gpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
  gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
  rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
  chmod +x /usr/local/bin/gosu; \
  gosu nobody true

# Configure Flink version
ENV FLINK_VERSION=1.4.2 \
    HADOOP_VERSION=27 \
    SCALA_VERSION=2.11

# Prepare environment
ENV FLINK_HOME=/opt/flink
ENV PATH=$FLINK_HOME/bin:$PATH
RUN groupadd --system --gid=9999 flink && \
    useradd --system --home-dir $FLINK_HOME --uid=9999 --gid=flink flink
WORKDIR $FLINK_HOME

ENV FLINK_URL_FILE_PATH=flink/flink-${FLINK_VERSION}/flink-${FLINK_VERSION}-bin-hadoop${HADOOP_VERSION}-scala_${SCALA_VERSION}.tgz
# Not all mirrors have the .asc files
ENV FLINK_TGZ_URL=https://www.apache.org/dyn/closer.cgi?action=download&filename=${FLINK_URL_FILE_PATH} \
    FLINK_ASC_URL=https://www.apache.org/dist/${FLINK_URL_FILE_PATH}.asc

# For GPG verification instead of relying on key servers
COPY KEYS /KEYS

# Install Flink
RUN set -ex; \
  wget -nv -O flink.tgz "$FLINK_TGZ_URL"; \
  wget -nv -O flink.tgz.asc "$FLINK_ASC_URL"; \
  \
  export GNUPGHOME="$(mktemp -d)"; \
  gpg --import /KEYS; \
  gpg --batch --verify flink.tgz.asc flink.tgz; \
  rm -rf "$GNUPGHOME" flink.tgz.asc; \
  \
  tar -xf flink.tgz --strip-components=1; \
  rm flink.tgz; \
  \
  chown -R flink:flink .;

# Configure container
COPY docker-entrypoint.sh /
ENTRYPOINT ["/docker-entrypoint.sh"]
EXPOSE 6123 8081
CMD ["help"]