Container exiting and log says only 'Switch to inspect mode'

General Discussions
#1

I’m trying to create and run a Rails app in container (Ruby image), however it exits 3 seconds after starting and the log is empty.

I’m creating the app using: docker-compose.exe run -d web rails new . --force --database=mysql --skip-bundle and run it with: docker-compose.exe up -d.

Here is my docker-compose.yml and rails.dockerfile:
version: ‘2’

services:
  web:
    build: 
      context: .
      dockerfile: .docker/rails.dockerfile
    volumes: 
      - .:/var/www
    ports: 
      - "3000:3000"
    depends_on:
      - 'mysql'
    networks:
      - ddoc-network


  mysql:
    image: mysql
    environment: 
      MYSQL_ROOT_PASSWORD: 'SOMETHING'
    networks:
      - ddoc-network


networks:
  ddoc-network:
    driver: bridge

rails.dockerfile

    FROM ruby:2.3.1

    MAINTAINER Juliano Nunes

    RUN apt-get update -qq && apt-get install -y build-essential mysql-client libmysqlclient-dev nodejs
    RUN mkdir /var/www
    WORKDIR /var/www

    ADD Gemfile /var/www/Gemfile
    ADD Gemfile.lock /var/www/Gemfile.lock
    RUN bundle install
    ADD . /var/www

    CMD ['bundle', 'exec', 'rails', 'server', '-b', '0.0.0.0']

And this is the output of docker ps -a:

And the output of docker-compose logs web:

What is wrong?

#2

I had a similar issue with unicorn. Dropping bundle exec, and calling the Ruby script directly fixed this issue for me. Try rails server -b 0.0.0.0.