Fig up error exec: "bundle": executable file not found in $PATH - sinatra

Question

I'm trying to run a Dockerized sinatra app with no database using fig, but I keep getting this error:
$ fig up
Recreating my_web_1...
Cannot start container 93f4a091bd6387bd28d8afb8636d2b14623a08d259fba383e8771fee811061a3: exec: "bundle": executable file not found in $PATH
Here is the Dockerfile
FROM ubuntu-nginx
MAINTAINER Ben Bithacker ben#bithacker.org
COPY Gemfile /app/Gemfile
COPY Gemfile.lock /app/Gemfile.lock
WORKDIR /app
RUN ["/bin/bash", "-l", "-c", "bundle install"]
ADD config/container/start-server.sh /usr/bin/start-server
RUN chmod +x /usr/bin/start-server
ADD . /app
EXPOSE 9292
CMD ["/usr/bin/start-server"]
The config/container/start-server.sh looks like this
#!/bin/bash
cd /app
source /etc/profile.d/rvm.sh
bundle exec rackup config.ru
The fig.yml looks like this:
web:
build: .
command: bundle exec rackup config.ru
volumes:
- .:/app
ports:
- "3000:3000"
environment:
- SOME_VAR=adsfasdfgasdfdfd
- SOME_VAR2=ba2gezcjsdhwzhlz24zurg5ira

Answer 1

I think there are a couple problems with this setup. Where is bundler installed? Normally you would apt-get install ruby-bundler and it would always be on your path.
I believe your immediate problem is that you're overriding the CMD from the Dockerfile with the command in the fig.yml. I'm assuming (based on the contents of start-server.sh) that you need the path to be set? You should remove the command line from the fig.yml.
You're also overriding the /app directory in the container with the volumes: .:/app in the fig.yml. You probably also want to remove that line.