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Docker Series 8: Trick, build old version software

Posted on Edited on In Disqus:
Docker can do a lot more than you might think, I'll show you how to do those things.

Background

I’m in charge of a system with Debian8 + Ruby2.1 + Puppet3.7. We need to migrate to Debian9. It relies on Puppet3.7 so much that we couldn’t change it. We need to build a static linked Ruby+Puppet, and ensure it will run in Debian9 or Debian10

Why Docker?

Why would we bother building with Docker instead of simply using a Debian8 machine?

  1. Unless we get a pure Debian8 host, there are plenty of dependencies bound to the system
  2. It seems that Virtual Machine could do this job, but it’s a little overweight.

The official Debian image is pure and easy to start and stop; what’s more, we could use the cached layers.

Dockerfile

Here is the dockerfile to build Ruby and Puppet.

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FROM debian:jessie

# upgrade & install required packages
RUN echo "deb http://mirrors.163.com/debian/ jessie main non-free contrib\n \
deb-src http://mirrors.163.com/debian/ jessie main non-free contrib\n \
deb http://mirrors.163.com/debian-security/ jessie/updates main non-free contrib\n \
deb-src http://mirrors.163.com/debian-security/ jessie/updates main non-free contrib" > /etc/apt/sources.list

# Ruby build system
RUN apt-get update && apt-get upgrade && apt-get install -y wget ruby-build

WORKDIR /home

# Download source package
RUN wget http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.5.tar.gz
RUN wget https://downloads.puppetlabs.com/puppet/puppet-3.7.2.tar.gz
RUN tar -zxf ruby-2.1.5.tar.gz
RUN tar -zxf puppet-3.7.2.tar.gz

RUN cd ruby-2.1.5 \
    && ./configure --prefix=/opt/puppet37 --disable-install-doc --disable-install-rdoc --disable-install-capi \
    && make -j8 \
    && make install

# In debian9, there is no library, wo need copy it.
RUN cp /usr/lib/x86_64-linux-gnu/libcrypto.so.1.0.0 /opt/puppet37/lib/
RUN cp /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0 /opt/puppet37/lib/

# Must specify the version, newer facter will block the puppet.
RUN /opt/puppet37/bin/gem install hiera -v 1.3.4
RUN /opt/puppet37/bin/gem install facter -v 2.2.0

# Install Puppet
RUN /opt/puppet37/bin/ruby /home/puppet-3.7.2/install.rb --no-rdoc

# make a package
RUN tar -cf puppet37_2_1_5.tar /opt/puppet37
RUN xz -9 puppet37_2_1_5.tar

# 构建
# docker build -t pp37 .
# docker run --rm --entrypoint cat pp37 /home/puppet37_2_1_5.tar.xz > ./puppet37_2_1_5.tar.xz

# 安装
# cp puppet37_2_1_5.tar.xz /tmp
# xz -d /tmp/puppet37_2_1_5.tar.xz 
# tar -xf /tmp/puppet37_2_1_5.tar -C /

Conclusion

As you can see, we create a building system with only a Dockerfile. It helps a lot with our migration.

We also use this method to build Nginx+Lua and ss5 inside the docker. Hope it could help you.

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