FROM alpine:3.8

MAINTAINER Newnius <newnius.cn@gmail.com>

USER root

# Prerequisites
RUN apk add --no-cache openssh openssl openjdk8-jre rsync bash procps

ENV JAVA_HOME /usr/lib/jvm/java-1.8-openjdk
ENV PATH $PATH:$JAVA_HOME/bin

# Passwordless SSH
RUN ssh-keygen -q -N "" -t dsa -f /etc/ssh/ssh_host_dsa_key
RUN ssh-keygen -q -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key
RUN ssh-keygen -q -N "" -t rsa -f /root/.ssh/id_rsa
RUN cp /root/.ssh/id_rsa.pub /root/.ssh/authorized_keys

ADD ssh_config /root/.ssh/config
RUN chmod 600 /root/.ssh/config
RUN chown root:root /root/.ssh/config

RUN echo "Port 2122" >> /etc/ssh/sshd_config

# Install Hadoop
ENV HADOOP_VER 2.9.1

RUN wget -O hadoop.tar.gz https://archive.apache.org/dist/hadoop/common/hadoop-$HADOOP_VER/hadoop-$HADOOP_VER.tar.gz && \
	tar -xzf hadoop.tar.gz -C /usr/local/ && rm hadoop.tar.gz

RUN ln -s /usr/local/hadoop-$HADOOP_VER /usr/local/hadoop

ENV HADOOP_HOME /usr/local/hadoop
ENV PATH $PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin

ENV HADOOP_PREFIX $HADOOP_HOME
ENV HADOOP_COMMON_HOME $HADOOP_HOME
ENV HADOOP_HDFS_HOME $HADOOP_HOME
ENV HADOOP_MAPRED_HOME $HADOOP_HOME
ENV HADOOP_YARN_HOME $HADOOP_HOME
ENV HADOOP_CONF_DIR $HADOOP_HOME/etc/hadoop
ENV YARN_CONF_DIR $HADOOP_PREFIX/etc/hadoop

# Default Conf Files
ADD config/* $HADOOP_HOME/etc/hadoop/

RUN sed -i "/^export JAVA_HOME/ s:.*:export JAVA_HOME=${JAVA_HOME}\nexport HADOOP_HOME=${HADOOP_HOME}\nexport HADOOP_PREFIX=${HADOOP_PREFIX}:" ${HADOOP_HOME}/etc/hadoop/hadoop-env.sh

RUN sed -i '/^export HADOOP_CONF_DIR/ s:.*:export HADOOP_CONF_DIR=$HADOOP_PREFIX/etc/hadoop/:' $HADOOP_PREFIX/etc/hadoop/hadoop-env.sh

WORKDIR $HADOOP_HOME

ADD bootstrap.sh /etc/bootstrap.sh

CMD ["/etc/bootstrap.sh"]