Help to build a base Fedora Docker image

[Keith Sharp]

I've been trying to get to grips with Docker over the last few days, and as learning exercise I've been trying to build a chain of images from scratch, however I've run into some problems and I hope someone can put me on the right track.

I working in a VM running Fedora 21 Beta Server, fully up to date.  My Docker version is docker-io 1.3.2-2.fc21.

The steps I've taken are:

1) Downloaded Fedora-Docker-Base-20141029-21_Beta.x86_64.tar.gz to a directory called fedora and created a file in that directory called Dockerfile with only three lines:

FROM scratch
MAINTAINER Keith Sharp <kms at passback.co.uk>

ADD Fedora-Docker-Base-20141029-21_Beta.x86_64.tar.gz /

2) Used the docker command to build a new image:

$ sudo docker build -t passback/fedora:21beta .
Sending build context to Docker daemon 83.58 MB
Sending build context to Docker daemon 
Step 0 : FROM scratch
Pulling repository scratch
511136ea3c5a: Pulling image (latest) from scratch, endpoint: https://registry-1.511136ea3c5a: Download complete 
Status: Downloaded newer image for scratch:latest
 ---> 511136ea3c5a
Step 1 : MAINTAINER Keith Sharp <kms at passback.co.uk>
 ---> Running in 9091a442001f
 ---> bbcce511a8de
Removing intermediate container 9091a442001f
Step 2 : ADD Fedora-Docker-Base-20141029-21_Beta.x86_64.tar.gz /
 ---> 7058f928f119
Removing intermediate container de568a0cb7f8
Successfully built 7058f928f119

3) So far so good, the images show up as expected:

$ sudo docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
passback/fedora     21beta              7058f928f119        2 minutes ago       225.7 MB
scratch             latest              511136ea3c5a        17 months ago       0 B

4) However, when I try to launch my new image I hit a problem:

$ sudo docker run --rm -ti passback/fedora:21beta /bin/sh
2014/11/26 14:15:10 Error response from daemon: Cannot start container 19fad5c0c8e1a11784b616d17d632c9a8978bdfed2fb2aca75252e28619ef5c1: exec: "/bin/sh": stat /bin/sh: no such file or directory

5) I had thought it was because I was missing a CMD or ENTRYPOINT instruction so I tried creating a new image based on this Dockerfile:

FROM passback/fedora:21beta
MAINTAINER Keith Sharp <kms at passback.co.uk>

CMD ["/bin/bash"]

6) The build works, but when I try to run I get the same error:

$ sudo docker run --rm -ti passback/test
2014/11/26 14:19:24 Error response from daemon: Cannot start container 1a20d7ceade9f4bc2d729ca081c10d849fe941e748de804fb1ad75abbf4d4941: exec: "/bin/bash": stat /bin/bash: no such file or directory

I'm sure I'm missing something simple, but no amount of searching is helping.  Could someone point me in the right direction?

Thanks,

Keith.