Eric Yang created HDDS-1648:
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Summary: Reduce Ozone docker image bloat
Key: HDDS-1648
URL: https://issues.apache.org/jira/browse/HDDS-1648
Project: Hadoop Distributed Data Store
Issue Type: Sub-task
Reporter: Eric Yang
Docker image can be more lean if multiple steps are group together and run by a
shell script. For example, all the install commands can be wrapped by a setup
shell script for Hadoop-runner.
{code}
#!/bin/bash
rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum install -y sudo python2-pip wget nmap-ncat jq java-11-openjdk
pip install robotframework
wget -O /usr/local/bin/dumb-init
https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64
chmod +x /usr/local/bin/dumb-init
mkdir -p /etc/security/keytabs && chmod -R a+wr /etc/security/keytabs
wget -O /opt/byteman.jar
https://repo.maven.apache.org/maven2/org/jboss/byteman/byteman/4.0.4/byteman-4.0.4.jar
chmod o+r /opt/byteman.jar
mkdir -p /opt/profiler && \
cd /opt/profiler && \
curl -L
https://github.com/jvm-profiling-tools/async-profiler/releases/download/v1.5/async-profiler-1.5-linux-x64.tar.gz
| tar xvz
yum install -y krb5-workstation
mkdir -p /etc/hadoop && mkdir -p /var/log/hadoop && chmod 1777 /etc/hadoop &&
chmod 1777 /var/log/hadoop
{code}
And Dockerfile is simplified to:
{code}
FROM centos
ADD setup.sh /
RUN /setup.sh
ADD scripts /opt/
ADD scripts/krb5.conf /etc/
WORKDIR /opt/hadoop
ENV HADOOP_LOG_DIR=/var/log/hadoop
ENV HADOOP_CONF_DIR=/etc/hadoop
ENTRYPOINT ["/usr/local/bin/dumb-init", "--", "/opt/starter.sh"]
{code}
This arrangement can drastically improve the rebuild performance of Docker
image. The end result of the image is 150MB less than current hadoop-runner
image on Github. The reduced intermediate layers shrinks the reference count
number to improve space usage.
We can also have two scripts, one for install binaries, and another one for
configure the image. This can even further reduce the build time, if the third
party binaries rarely changes.
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