Modifying golang Docker Container using the running shell

Question

I'm using Docker to deploy my web service to Google Compute Engine and I'm following the instructions given here: https://blog.golang.org/docker

I want to install ffmpeg in the golang container and my approach is to get access to the shell as

docker run -t -i my-webservice /bin/bash

In contrary to the ubuntu:14.04 image, I don't get access to the bash shell. How can that be?

I have also found an image, where the ffmpeg is already configured and installed (https://registry.hub.docker.com/u/cellofellow/ffmpeg/). Is it possible to get access to the container from the golang container or do I have to install ffmpeg into my own docker image?

Did you try /bin/sh? Bash is not a must on Linux. There might be other shell installed, probably dash. — Grzegorz Żur
– Grzegorz Żur, Commented Nov 18, 2014 at 19:19
Unfortunately, that doesn't work either. I have tried csh, tcsh, ksh, sh (assumed installed in /bin) — borrel
– borrel, Commented Nov 18, 2014 at 19:45
Although you probably should be incorporating the ffmpeg installation as much as possible into the Dockerfile, if you really need access to the container use docker-enter from the nsenter package. Install using docker run --rm -v /usr/local/bin:/target jpetazzo/nsenter. See github.com/jpetazzo/nsenter for more info. — Intermernet
– Intermernet, Commented Nov 20, 2014 at 13:01

frvi · Accepted Answer · 2014-11-18 22:35:00Z

1

A better approach would be to install ffmpeg to your golang container by adding a RUN to your Dockerfile, like

RUN apt-get update RUN apt-get install -y ffmpeg

The words modifying, Docker Container, running shell, kind of contradicts the meaning of Docker.

answered Nov 18, 2014 at 22:35

frvi

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borrel · Accepted Answer · 2014-11-19 16:50:07Z

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Installing ffmepeg is not as simple if additional codecs need to be installed as well, being the reason that I would like to play around using the shell before writing the docker script (copying the Docker script from cellofellow/ffmpeg works).

An answer to the problems are described here: https://github.com/docker-library/golang/issues/27

answered Nov 19, 2014 at 16:50

borrel

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