Error when creating a Docker image for Ruby On Rails environment (from a Dockerfile)

Question

I guess it's a environment problem. When I do it manually (without a Dockerfile) it works.

Here's my Dockerfile:

FROM ubuntu:14.04
RUN apt-get update
RUN apt-get upgrade --assume-yes
RUN apt-get install wget vim git --assume-yes
# install RVM
RUN apt-get install build-essential curl --assume-yes
RUN curl -L https://get.rvm.io | bash -s stable
RUN echo 'source /etc/profile.d/rvm.sh' >> ~/.bashrc
RUN /usr/local/rvm/bin/rvm-shell -c "rvm requirements"
# install Ruby
RUN /usr/local/rvm/bin/rvm-shell -c "rvm autolibs enable"
RUN /usr/local/rvm/bin/rvm-shell -c "rvm install 2.1.2"
# install Rails
RUN echo "gem: --no-rdoc --no-ri" >> ~/.gemrc
RUN gem install rails -v 4.1.5
# install nodeJS
RUN sudo apt-get install nodejs --assume-yes
EXPOSE 3000

Than I build with:

sudo docker build -t="james/rails" .

I get that error:

Step 11 : RUN gem install rails -v 4.1.5
 ---> Running in 44efc6b7c254
/bin/sh: 1: gem: not found
2014/09/04 18:33:52 The command [/bin/sh -c gem install rails -v 4.1.5] returned a non-zero code: 127

Answer 1

Try RUN /bin/bash -l -c "gem install rails -v 4.1.5" instead of the line you've got in there. Does that change anything?

Answer 2

With the help from Alex Lynham, here's a working Dockerfile:

FROM ubuntu:14.04

RUN apt-get update
RUN apt-get install wget vim git --assume-yes

# install RVM
RUN apt-get install build-essential curl --assume-yes
RUN curl -L https://get.rvm.io | bash -s stable
RUN echo 'source /etc/profile.d/rvm.sh' >> ~/.bashrc
RUN /usr/local/rvm/bin/rvm-shell -c "rvm requirements"

# install Ruby
RUN /bin/bash -l -c "rvm autolibs enable"
RUN /bin/bash -l -c "rvm install 2.1.2"

# install Rails
RUN echo "gem: --no-rdoc --no-ri" >> ~/.gemrc
RUN /bin/bash -l -c "gem install rails -v 4.1.5"

# install nodeJS
RUN sudo apt-get install nodejs --assume-yes

EXPOSE 3000