ruby-on-rails - Docker compose-build 与 rake Assets :precompile

Question

我试图将我的应用程序设置为在生产模式下运行，但我在构建 Assets 文件夹时遇到了问题，特别是在我的 Dockerfile 中的这一行:

RUN bundle exec rake RAILS_ENV=production DATABASE_URL=postgresql://user:pass@127.0.0.1/dbname SECRET_TOKEN=dummytoken assets:precompile

数据库只是一个虚拟线。问题是当它运行 rake 时，它​​似乎没有看到 env 变量，并且在它初始化carrierwave.rb 时出现以下错误

rake aborted!
ArgumentError: Missing required arguments: aws_access_key_id, aws_secret_access_key
/usr/local/bundle/gems/fog-core-1.42.0/lib/fog/core/service.rb:244:in `validate_options'
/usr/local/bundle/gems/fog-core-1.42.0/lib/fog/core/service.rb:268:in `handle_settings'
/usr/local/bundle/gems/fog-core-1.42.0/lib/fog/core/service.rb:98:in `new'
/usr/local/bundle/gems/fog-core-1.42.0/lib/fog/core/services_mixin.rb:16:in `new'
/usr/local/bundle/gems/fog-core-1.42.0/lib/fog/storage.rb:27:in `new'
/usr/local/bundle/gems/carrierwave-0.11.2/lib/carrierwave/uploader/configuration.rb:83:in `eager_load_fog'
/usr/local/bundle/gems/carrierwave-0.11.2/lib/carrierwave/uploader/configuration.rb:96:in `fog_credentials='
/mnt/hgfs/Projects/livingrecipe/config/initializers/carrierwave.rb:3:in `block in <top (required)>'
/usr/local/bundle/gems/carrierwave-0.11.2/lib/carrierwave/uploader/configuration.rb:118:in `configure'
/usr/local/bundle/gems/carrierwave-0.11.2/lib/carrierwave.rb:14:in `configure'
/mnt/hgfs/Projects/livingrecipe/config/initializers/carrierwave.rb:1:in `<top (required)>'

错误还有几行，但第一行说明了一切，aws_access_key_id 和 aws_secret_access_key 的 ENV 变量似乎没有加载。如果我在不尝试预编译 Assets 的情况下运行它，一切正常，但我需要预编译 Assets 以使它们对 nginx 可见

我确实发现为了修复我可以用它们替换 ENV 变量，这是有问题的代码:

CarrierWave.configure do |config|

  config.fog_credentials = {
    provider:               'AWS',                             # required
    aws_access_key_id:      ENV['AWS_ACCESS_KEY_ID'],            # required
    aws_secret_access_key:  ENV['AWS_SECRET_ACCESS_KEY'],     # required
    region:                 'us-west-2'                        # optional, defaults to 'us-east-1'
  }
  config.fog_directory  = ENV['S3_BUCKET_NAME']               # required
  #config.fog_host       = 'https://assets.example.com'           # optional, defaults to nil
  #config.fog_public     = false                                  # optional, defaults to true
  config.fog_attributes = {'Cache-Control'=>'max-age=315576000'}  # optional, defaults to {}
end

所以我只需要输入键就可以使用它......但显然这不是一个很好的长期解决方案，让键被编程。

Answer 1

你的问题有点变化，所以我要解决你的最后一句话:

So I got it to work with just typing in the keys...but obviously that isn't a good solution long term to have the keys programmed in.

如果您确定要在构建期间处理此问题，而不是将您的 rake 任务添加到您的 command条目，您可以设置 build args在您的 docker-compose.yml 配置文件中。

# compose.yml
version: '2'
services:
  app:
    # ...
    build:
      context: .
      args:
        # This will make your variables available during the
        # "build" phase.
        # You can hardcode these values here, or better, 
        # add them to a .env file, whose contents  
        # Docker/Compose will make available during the build.
        - AWS_ACCESS_KEY_ID
        - AWS_SECRET_ACCESS_KEY
        - DATABASE_URL
        - SECRET_TOKEN
    environment:
      # You should also add these values to your application's 
      # environment.
      # You can hardcode these values here, or better, 
      # add them to a .env file, whose contents  
      # Docker/Compose will make available to your running container.
      - AWS_ACCESS_KEY_ID
      - AWS_SECRET_ACCESS_KEY
      - DATABASE_URL
      - SECRET_TOKEN

然后，您可以在 Dockerfile 中声明和使用构建参数:

# Dockerfile
# ...
ARG AWS_ACCESS_KEY_ID
ARG AWS_SECRET_ACCESS_KEY
ARG DATABASE_URL
ARG SECRET_TOKEN
# these values will now be available to your rake task 
# in ENV['AWS_ACCESS_KEY_ID'], etc.
RUN bundle exec rake RAILS_ENV=production assets:precompile