Webpacker: ActionController::RoutingError (No route matches [GET] "/packs/index-effb542be2baccc64610.js"

[krobi64]

We are trying to run Rails 5 with Webpacker in a Docker environment. We do not want the webpacker-dev-server; we want to pre-compile the assets.

Our docker file looks like the following:

FROM ruby:2.4.1
RUN apt-get update -qq && apt-get install -y \
    build-essential \
    libxml2-dev \
    libxslt1-dev \
    redis-tools \
        npm
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
RUN curl -sL https://deb.nodesource.com/setup_8.x | bash
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list

RUN apt-get install -y nodejs
RUN apt-get update && apt-get install yarn

# cleanup
RUN rm -rf /var/lib/apt/lists/*

RUN mkdir -p /landing_app
WORKDIR /landing_app
ADD Gemfile /landing_app
ADD Gemfile.lock /landing_app
RUN bundle install

COPY . /landing_app
RUN npm rebuild node-sass --force
RUN yarn install
RUN RAILS_ENV=beta NODE_ENV=production SKIP_REDIS=true bundle exec rails webpacker:compile

EXPOSE 3042
CMD bundle exec rails s -p 3042 -b '0.0.0.0'

Our webpacker.yaml file looks like this:

default: &default
  source_path: app/javascript
  source_entry_path: packs
  public_output_path: packs
  cache_path: tmp/cache/webpacker

  # Additional paths webpack should lookup modules
  # ['app/assets', 'engine/foo/app/assets']
  resolved_paths: []

  # Reload manifest.json on all requests so we reload latest compiled packs
  cache_manifest: false

  extensions:
    - .coffee
    - .erb
    - .js
    - .jsx
    - .ts
    - .vue
    - .sass
    - .scss
    - .css
    - .png
    - .svg
    - .gif
    - .jpeg
    - .jpg

development:
  <<: *default
  compile: true

  # Reference: https://webpack.js.org/configuration/dev-server/
  dev_server:
    https: false
    host: localhost
    port: 3035
    public: localhost:3035
    hmr: false
    # Inline should be set to true if using HMR (Hot Module Replacement)
    inline: false
    overlay: true
    disable_host_check: true
    use_local_ip: false

test:
  <<: *default
  compile: true

  # Compile test packs to a separate directory
  public_output_path: packs-test

beta:
  <<: *default
  compile: false
  cache_manifest: true

production:
  <<: *default

  # Production depends on precompilation of packs prior to booting for performance.
  compile: false

  # Cache manifest.json for performance
  cache_manifest: true

Inside the docker container, I see all of the compiled files in APP_HOME/public/packs, and the manifest.json looks correct in the same location.

However, whenever I try to access the page, the Rails app is returning with the above error message.

I don't understand why files in the public directory are not being served.

[gauravtiwari]

You have to enable config.public_file_server.enabled in Rails so it can serve static assets.

[krobi64]

nm, our config/environments/beta.rb
had config.public_file_server.enabled set to an environment variable we weren't passing in.