Ruby on rails RubyonRails 6+；Docker=Webpacker:：Manifest:：MissingEntryError？

尝试将my Rails应用程序作为Docker容器运行，但在打开页面时出现以下错误：

Webpacker can't find application in /app/public/packs/manifest.json. Possible causes:
1. You want to set webpacker.yml value of compile to true for your environment
   unless you are using the `webpack -w` or the webpack-dev-server.
2. webpack has not yet re-run to reflect updates.
3. You have misconfigured Webpacker's config/webpacker.yml file.
4. Your webpack configuration is not creating a manifest.
Your manifest contains:
{
}

当我使用rails s运行应用程序时，它运行得很好，并且创建了public/packs文件夹。 在日志中还有

/usr/local/bundle/gems/webpacker-4.2.0/lib/webpacker/runner.rb:13:in ``': No such file or directory - yarn (Errno::ENOENT)

错误，尽管我检查了容器纱线-v显示已安装纱线

Dockerfile

FROM ruby:2.6.3
RUN apt-get update -qq \
    && curl -sL https://deb.nodesource.com/setup_12.x  | bash - \
    && apt-get install -y nodejs \
    && curl -o- -L https://yarnpkg.com/install.sh | bash
RUN mkdir /app
WORKDIR /app
COPY Gemfile /app/Gemfile
COPY Gemfile.lock /app/Gemfile.lock
RUN bundle install
COPY . /app

# Add a script to be executed every time the container starts.
COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

# Start the main process.
CMD ["rails", "server", "-b", "0.0.0.0"]

docker-compose.yml

version: '3'
services:
  webpacker:
    build: .
    env_file:
      - '.env.docker'
    command: ./bin/webpack-dev-server
    volumes:
      - .:/app
    ports:
      - '3035:3035'
  web:
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/app
    ports:
      - "3000:3000"

环境署署长

NODE_ENV=development
RAILS_ENV=development
WEBPACKER_DEV_SERVER_HOST=0.0.0.0

---

按照以下步骤操作

i） docker compose

run{rails\u app\u name}

然后再次使用

ii）

docker compose build{rails\u app\u name}

iii）

docker-compose-up

参考：

---

[1] ：

更新：我可以使用

docker exec-it sitemap\u web\u 1 bash-lc./bin/webpack dev server”

通过登录shell手动启动webpack dev server。看起来问题的根源在于环境的可视性你有没有弄明白这一点？现在用Rails 6.0.3和19.03.8来处理这个问题