docker-cleanroom

This tools is designed to produce minimal busybox-based Docker container images using a cleanroom-style build environment.

Usage

First up, clone yourself a copy of the repository

git clone https://github.com/GreyDev/docker-cleanroom.git
cd docker-cleanroom

Next up we need to create our base build environment. This image contains a full image of Ubuntu, and building this will take care of the heavy lifting in installing build-essentials and other tools. This will speed up our builds considerably.

./contrib/build-ubuntu-dev/build.sh

Once we have our base build container, we can start being productive. Let's build our first container.

./build.sh <build scripts> <output container>
./build.sh busybox mybusybox
./build.sh httpd myhttpd

Hopefully, if all goes well we should see Building Docker image busybox complete..
We can test our image using standard Docker commands:

docker images
docker run -t -i mybusybox /bin/ash
docker run -t -i -p 80:80 myhttpd /bin/thttpd -D

And we're done!

Custom Containers

Custom containers can be created very simply. An example build-httpd has been supplied.
The process is as follows:

A clean build environment is created using our custom ubuntu-dev as a base
A working directory for our Busybox root filesystem is created in /rootfs
We add install/install.sh into our build evironment
We create a container from the image, and run the install scrips.
/rootfs.tar is created from /rootfs
/rootfs.tar is extracted from the build environment
A final image is produced using the rootfs.tar