Docker Image Builder

A Docker image that is used to build other Docker images using other resources.

Building the Docker Image

To build the image, from the repository root:

docker build -t runnable/image-builder .

Building an Image

This builds an image from the following resources:

• Dockerfile (stored on S3, versioned)
• Source directory (on S3, with versions)
• Repository:
  • From Github private repo - using a deploy key
  • From Github public repo - using https

Building an image with this image is a simple as using docker run and setting up environment variables in the command. An example script is included (example.sh), the contents of which are here (with some notes on each below):

docker run \
  -e RUNNABLE_AWS_ACCESS_KEY='AWS-ACCESS-KEY' \
  -e RUNNABLE_AWS_SECRET_KEY='AWS-SECRET-KEY'  \
  -e RUNNABLE_FILES_BUCKET='aws.bucket.name'  \
  -e RUNNABLE_PREFIX='source/' \
  -e RUNNABLE_FILES='{ "source/Dockerfile": "Po.EGeNr9HirlSJVMSxpf1gaWa5KruPa" }'  \
  -e RUNNABLE_KEYS_BUCKET='aws.keys.bucket.name'  \
  -e RUNNABLE_DEPLOYKEY='path/to/a/id_rsa'  \
  -e RUNNABLE_REPO='[email protected]:visionmedia/express'  \
  -e RUNNABLE_COMMITISH='master'  \
  -e RUNNABLE_DOCKER='tcp://192.168.59.103:2375' \
  -e RUNNABLE_DOCKERTAG='docker-tag' \
  -e RUNNABLE_DOCKER_BUILDOPTIONS='' \
  -v /host/path/to/cache:/cache:rw  \
  runnable/image-builder

• RUNNABLE_AWS_ACCESS_KEY: your AWS access key
• RUNNABLE_AWS_SECRET_KEY: your AWS secret access key
• RUNNABLE_FILES_BUCKET: bucket where the Dockerfile/source files are stored
• RUNNABLE_PREFIX: prefix of the source path of the files in S3
• RUNNABLE_FILES: a string representing a JSON object with S3 Key: VersionId. This MUST include a Dockerfile, and optionally can contain other files for the source directory
• RUNNABLE_KEYS_BUCKET: for a private repository, this is the bucket where deploy keys are stored
• RUNNABLE_REPO: repository to checkout using git. Must be in the SSH format, w/ no .git at the end
• RUNNABLE_COMMITISH: something to checkout in the repository
• RUNNABLE_DOCKER: Docker connection information, best formatted tcp://ipaddress:port
• RUNNABLE_DOCKERTAG: Tag for the built Docker image
• RUNNABLE_DOCKER_BUILDOPTIONS: other Docker build options
• -v /host/path/to/cache:/cache:rw: cache for github repos

Multiple Repositories

This supports checking out multiple repositories, with multiple commitishes, and deploy keys. Set the variable using ; as the separator and it will download all of them.

The following variables support multiple values:

• RUNNABLE_DEPLOYKEY
• RUNNABLE_REPO
• RUNNABLE_COMMITISH

NOTE: RUNNABLE_REPO and RUNNABLE_COMMITISH need to be a one-to-one correspondence for it to work correctly (does NOT assume master or any other value).

Debugging the Builder

If you need to debug the builder, you can set the environment variables, then additionally set --rm -ti as run options, and put bash on the end of the command after runnable/image-builder. This will dump you into a shell where you can run ./dockerBuild.sh to manually run the build!