I have a docker image which installs grunt, but when I try to run it, I get an error:
Error response from daemon: Cannot start container foo_1: \
exec: "grunt serve": executable file not found in $PATH
If I run bash in interactive mode, grunt is available.
What am I doing wrong?
Here is my Dockerfile:
# https://registry.hub.docker.com/u/dockerfile/nodejs/ (builds on ubuntu:14.04)
FROM dockerfile/nodejs
MAINTAINER My Name, me@email.com
ENV HOME /home/web
WORKDIR /home/web/site
RUN useradd web -d /home/web -s /bin/bash -m
RUN npm install -g grunt-cli
RUN npm install -g bower
RUN chown -R web:web /home/web
USER web
RUN git clone https://github.com/repo/site /home/web/site
RUN npm install
RUN bower install --config.interactive=false --allow-root
ENV NODE_ENV development
# Port 9000 for server
# Port 35729 for livereload
EXPOSE 9000 35729
CMD ["grunt"]
When you use the exec format for a command (e.g., CMD ["grunt"], a JSON array with double quotes), it will be executed without a shell. This means that most environment variables will not be present.
If you specify your command as a regular string (e.g. CMD grunt) then the string after CMD will be executed with /bin/sh -c.
More info on this is available in the CMD section of the Dockerfile reference.