Dockerfile-alpine.template

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FROM openjdk:8-jre-alpine

# Install dependencies, bash and su-exec for easy step-down from root
RUN apk add --no-cache bash libc6-compat snappy 'su-exec>=0.2'

# Configure Flink version
ENV FLINK_VERSION=%%FLINK_VERSION%% \
    HADOOP_SCALA_VARIANT=%%HADOOP_SCALA_VARIANT%%

# Prepare environment
ENV FLINK_HOME=/opt/flink
ENV PATH=$FLINK_HOME/bin:$PATH
RUN addgroup -S -g 9999 flink && \
    adduser -D -S -H -u 9999 -G flink -h $FLINK_HOME flink
WORKDIR $FLINK_HOME

ENV FLINK_URL_FILE_PATH=flink/flink-${FLINK_VERSION}/flink-${FLINK_VERSION}-bin-${HADOOP_SCALA_VARIANT}.tgz
# Not all mirrors have the .asc files
ENV FLINK_TGZ_URL=https://www.apache.org/dyn/closer.cgi?action=download&filename=${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; \
  apk add --no-cache --virtual .build-deps \
    ca-certificates \
    gnupg \
    openssl \
    tar \
  ; \
  \
  wget -nv -O flink.tgz "$FLINK_TGZ_URL"; \
  wget -nv -O flink.tgz.asc "$FLINK_ASC_URL"; \
  \
  export GNUPGHOME="$(mktemp -d)"; \
  gpg --batch --import /KEYS; \
  gpg --batch --verify flink.tgz.asc flink.tgz; \
  gpgconf --kill all; \
  rm -rf "$GNUPGHOME" flink.tgz.asc; \
  \
  tar -xf flink.tgz --strip-components=1; \
  rm flink.tgz; \
  \
  apk del .build-deps; \
  \
  chown -R flink:flink .;

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