How to bind the docker container and the cuba process through localhost:9292 in Ubuntu 14

Question

I'm on ubuntu 14.04 and I have a super simple Cuba App which seems to be lacking something:

Gemfile:

source "https://rubygems.org"
gem 'cuba'

config.ru

require "./hello_world"
run Cuba

docker-compose.yml

web:
  build: .
  volumes:
    - .:/myapp
  ports:
    - "9292:9292"
  command: bundle exec rackup -p 9292

Dockerfile

FROM jruby:1.7.19

RUN mkdir /myapp
WORKDIR /myapp
ADD . /myapp

RUN bundle install

I've tryed to run it through the docker-compose up. Which builds the image and binds me the cuba process in the terminal. I can see the server listening to the port 9292. But I'm totally unable to access it through the localhost:9292 url.

Ok, what about if you do `docker exec -it CONTAINER /bin/bash` then try accessing localhost:9292 with curl, does that work? (Replace CONTAINER with the name of your container) — Adrian Mouat, Apr 21 '15 at 19:22
No, I wasn't able to do it. I think the host is not binded. Gonna check the rackup help. — Jorge de los Santos, Apr 21 '15 at 19:27
Ok, but then I would have expected you would have been able to access the port from inside the container... — Adrian Mouat, Apr 21 '15 at 19:36
I wasn't the container was not binded to any IP. I had to bind it to the host 0.0.0.0. I'm not still able to understand what's going on in the backstage. Any addition to my answer will be appreciated. — Jorge de los Santos, Apr 21 '15 at 19:39
Ok. I don't know ruby well enough to comment. I would have expected it to bind to127.0.0.1 by default. 0.0.0.0 listens to all interfaces, so that's why that works. — Adrian Mouat, Apr 21 '15 at 20:50

score 0 · Accepted Answer · answered Apr 21 '15 at 19:29

0

Seems like by default the host is not binded to the docker daemon ip. Changing the docker-compose.yml and adding the rackup option fixed it.

web:
  build: .
  volumes:
    - .:/myapp
  ports:
    - "9292:9292"
  command: bundle exec rackup -o 0.0.0.0

answered Apr 21 '15 at 19:29

Jorge de los Santos

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How to bind the docker container and the cuba process through localhost:9292 in Ubuntu 14

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