communitycloud/docker-builder repository overview

This image contains debian:jessie base image with added wget and vim and a statically built docker binary (taken from boot2docker). Use this image to build a disposable docker build environment on CoreOS, avoiding the pollution of the CoreOS host.

Mount the host's docker server socket into the image:

# docker run -it --rm -v /var/run/docker.sock:/var/run/docker.sock communitycloud/docker-builder
Unable to find image 'communitycloud/docker-builder:latest' locally
Pulling repository communitycloud/docker-builder
a1be0046a8dc: Download complete 
511136ea3c5a: Download complete 
16386e29a1f4: Download complete 
835c4d274060: Download complete 
1c801018fb2f: Download complete 
21982675376f: Download complete 
be614e31068e: Download complete 
Status: Downloaded newer image for communitycloud/docker-builder:latest

Now we can work with the host's docker server:

root@042c9197b157:/# docker images

REPOSITORY                     TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
communitycloud/docker-builder   1.4.1               a1be0046a8dc        25 hours ago        215.6 MB
communitycloud/docker-builder   latest              a1be0046a8dc        25 hours ago        215.6 MB

Once the image boots, we have access to the host docker server and images. Any images built or ran from the disposable build environment will be stored and run on the host.

The workflow is thus:

• Run a new disposable docker builder
• Build the binary if needed by apt-getting necessary files, etc.
• Build the docker image
• Test the image by running containers from the disposable environment
• Push the docker image to the repository
• Dispose the environment.
• The image will already be available on the host, since the environment was mapped to its docker server through the socket.