Build a CentOS 6.3 base image for docker

Modified from https://github.com/blalor/docker-centos-base

Building of the rootfs can only happen on a CentOS6.3 OS.

After installing the OS, install febootstrap

yum install febootstrap

Then run the build_centos_63.sh to generate the centos63.tar.xz file.

A binary blob of the tar is checked in but you can regenerate if you need.

Once you have the tar file with basic rootfs you can build the image.

From this folder call docker build on the Dockerfile.

docker build --rm -f c6.3base.dockerfile -t matrim/centos6.3:latest .

This image is available from https://hub.docker.com/r/matrim/centos6.3/