Docker build in any Docker container

This is useful for having containers with your build tools and then creating a runtime container for your application which is not polluted with the build tools and source code.

alias itsWhalesAllTheWayDown='docker run -v /var/run/docker.sock:/var/run/docker.sock -v $(which docker):$(which docker) '

Launch your builder and run bash.

itsWhalesAllTheWayDown --rm -it -v $(pwd):/myapp myapp-builder /bin/bash

Or if you have a build script as the ENTRYPOINT

itsWhalesAllTheWayDown -d -v $(pwd):/myapp myapp-builder ...args to your script...

Now run your docker commands from within the docker container you are running. It will talk to the external docker-daemon and build your image externally.

Add the alias to your .profile, .bash_profile, or .bashrc

docker build -t golang-dockerizer .

this may be broken right now

alias itsGophersAllTheWayDown='itsWhalesAllTheWayDown -e "APPDIR=$(pwd)" -e "EXTERNAL_GOPATH=$GOPATH" -v $(pwd):$(pwd)) --rm -it golang-dockerizer'

In your Golang project directory, create a Dockerfile like this:

FROM scratch

ADD GoappBinary /GoappBinary

ENTRYPOINT ["/GoappBinary"]

# include any other docker stuff you'd like
# ADD src/www /www
# EXPOSE 8080
# VOLUME /path/to/dir

Then run

itsGophersAllTheWayDown <image-name>

This will produce a Docker image with just your Golang app.

-- Image courtesy of https://ferrebeekeeper.files.wordpress.com/2015/03/discworld.jpg --