Linux personality (reported ex. via uname -m) is wrong #1
Description
You only have to set ENTRYPOINT ["linux32", "--"] to fix this.
Right now I use my own Dockerfile on top of yours:
FROM ioft/i386-ubuntu:14.04.3
ENTRYPOINT ["linux32", "--"]
Test:
$ docker run -ti --rm ioft/i386-ubuntu:14.04.3 uname -m
x86_64
$ docker build -t ubuntu32 - <Dockerfile
$ docker run -ti --rm ubuntu32 uname -m
i686