docker executable file not found in $PATH

问题:

Trying to run a rails migration on a running docker compose container throws this error:

$ docker-compose run webapp rails db:migrate 

ERROR: Cannot start service webapp: invalid header field value "oci runtime error: container_linux.go:247: starting container process caused \"exec: \\"rails\\": executable file not found in $PATH\"\n"

However, I can access rails from inside the container:

$ docker-compose run webapp bash root@3fd3a87275a1:/home/app/webapp# which rails /usr/local/rvm/gems/ruby-2.3.1/bin/rails 

My container is already running and I can GET the page:

$ curl http://localhost -i HTTP/1.1 200 OK Content-Type: text/html; charset=utf-8 Transfer-Encoding: chunked Connection: keep-alive Status: 200 OK Cache-Control: max-age=0, private, must-revalidate ETag: W/"b62d4f67b7b823c017534cd9727752cd" X-Frame-Options: SAMEORIGIN X-XSS-Protection: 1; mode=block X-Content-Type-Options: nosniff X-Runtime: 0.019881 X-Request-Id: eb32ec21-3a8f-4caa-a27b-2e42f0b2bce9 Date: Thu, 15 Dec 2016 15:15:59 GMT X-Powered-By: Phusion Passenger 5.0.29 Server: nginx/1.10.1 + Phusion Passenger 5.0.29 

How do I run rails db:migrate in my container?

Dockerfile

FROM phusion/passenger-ruby23  # Set correct environment variables. ENV HOME /root  # Use baseimage-docker's init process. CMD ["/sbin/my_init"]  # additional packages RUN apt-get update  # Active nginx RUN rm -f /etc/service/nginx/down  # Install bundle of gems WORKDIR /tmp ADD Gemfile /tmp/ ADD Gemfile.lock /tmp/ RUN bundle install  # Copy the nginx template for configuration and preserve environment variables RUN rm /etc/nginx/sites-enabled/default  # Add the nginx site and config ADD webapp.conf /etc/nginx/sites-enabled/webapp.conf  RUN mkdir /home/app/webapp COPY . /home/app/webapp RUN usermod -u 1000 app RUN chown -R app:app /home/app/webapp WORKDIR /home/app/webapp  # Clean up APT when done. RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* EXPOSE 80 

Docker Compose

version: '2' services:   webapp:     build: .     container_name: myapp     working_dir: /home/app/webapp     ports:       - "80:80"     environment:       - PASSENGER_APP_ENV=development     volumes:       - .:/home/app/webapp     networks:       - back-end   db:     container_name: db     image: postgres:9.4     networks:       - back-end networks:   back-end:     driver: bridge 

回答1:

I don't know why this is happening, and I've filed an issue, but in the meantime, here's a workaround:

docker-compose run webapp bundle exec rails db:migrate 

Please answer this question with a proper fix, and I'll accept your answer.

文章来源: docker executable file not found in $PATH