aussieade/docker-buildroot repository overview

⁠docker-buildroot-x86_64

Use this image to build really small docker images.

To use it clone the buildroot system somewhere on your machine

$ git clone git://git.buildroot.net/buildroot

Run the container with

$ docker run -t -i -v ~/buildroot:/buildroot aussieade/docker-buildroot-x86_64

This will drop you into a bash shell ready to build your image.

For an example of how to use this to build something see Even Smaller Docker OpenVPN Container⁠

The included .config is set for x86_64 and presumes there is a /buildroot/docker/post.sh file to fix up the generated image present containing

#!/bin/bash

if [ "$TARGET_DIR" = "" ]; then
echo "POST: TARGET_DIR not set"
exit 1
fi

rm $TARGET_DIR/etc/resolv.conf $TARGET_DIR/sbin/init
touch $TARGET_DIR/etc/resolv.conf $TARGET_DIR/sbin/init

Note: if you are using this with virtualbox builds will fail as symlinking is not allowed on shared volumes (see this ticket⁠).

Allegedly for a vm called default and share called /Users you can fix this with

$ VBoxManage getextradata default enumerate | grep Symlinks
Key: VBoxInternal2/SharedFoldersEnableSymlinksCreate/Users, Value: 0

$ VBoxManage setextradata default VBoxInternal2/SharedFoldersEnableSymlinksCreate/Users 1

you will need to restart the guest before this takes effect. This didn't seem to work for me with virtualbox 5.0.4, ymmv.