部署 Ruby on Rails 6 - AWS Elastic Beanstalk - Docker: ArgumentError: Missing `secret_key_base`

Question

我似乎无法找到为 Ruby on Rails 6 - AWS Elastic Beanstalk - Docker 部署设置 secret_key_base 的正确方法。因此，部署不断失败。我一直在尝试遵循本教程：https://dev.to/fdoxyz/elastic-beanstalk-apps-using-docker-containers-56l8

系统：

• Ubuntu 18.04
• ruby 2.6.5p114（2019-10-01 修订版 67812）[x86_64-linux]
• 捆绑器版本 2.1.4
• Rails 6.0.2.1
• Docker 版本 18.09.7，构建 2d0083d
• 节点 v12.16.1

以下是我从空目录到部署的步骤：

mkdir new_project && cd new_project
eb init
     2) us-west-1 : US West (N. California)
     2) [ Create new Application ]
     (default is "new_project")
     8) Docker
     Do you want to set up SSH for your instances? Y
     Select a keypair.

eb create
     Enter Environment Name (default is new-project-dev)
     Enter DNS CNAME prefix (default is new-project-dev)
     Select a load balancer type: 2) application
     enable Spot Fleet? n
     download the sample application into the current directory? n

eb setenv SECRET_KEY_BASE=$(ruby -e "require 'securerandom';puts SecureRandom.hex(64)")
eb setenv RAILS_ENV=production

cat .gitignore
rails new .
vim .gitignore (paste old contents of gitignore)
touch Dockerfile
vim Dockerfile

===============
FROM ruby:2.6.5

# Install NodeJS & Yarn
RUN apt-get update && \
    apt-get install apt-transport-https && \
    curl -sL https://deb.nodesource.com/setup_12.x | bash - && \
    apt-get purge nodejs && \
    apt-get update && \
    apt-get install nodejs -y && \
    npm install yarn -g  && \
    gem install bundler -v 2.1.4

# Workdir and add dependencies
WORKDIR /app/
ADD Gemfile Gemfile.lock /app/

# Throw errors if Gemfile has been modified since Gemfile.lock
RUN bundle config --global frozen 1

# Install dependencies
ARG RAILS_MASTER_KEY
ENV RAILS_ENV=production NODE_ENV=production RAILS_SERVE_STATIC_FILES=1
RUN bundle install --without development test

# Add the app code, precompile assets and use non-root user
ADD . /app/
RUN rake assets:precompile DISABLE_SPRING=1 && \
    chown -R nobody:nogroup /app
USER nobody
ENV HOME /app

# Make sure to explicitly bind to port & interface
CMD ["bundle", "exec", "rails s -p 3000 -b 0.0.0.0"]
===============

vim config/environments/production.rb
insert at the top of the file:
    config.secret_key_base = ENV["SECRET_KEY_BASE"]

git add . && git commit -m "Initial commit"
eb use new_project-dev
eb deploy

这是从 ssh 到 '/var/log/eb-activity.log' 实例的完整日志：

https://raw.githubusercontent.com/maxtocarev/eb-log/master/eb-activity.log

Answer 1

secret_key_base 是存储在Rails encrypted credentials 中的值。构建 Docker 映像时，来自 Dockerfile 内部的命令 rake assets:precompile 似乎失败，因为它需要 secret_key_base 值。我相信发生这种情况是因为它在您的本地项目中没有config/master.key。我建议使用以下方式将其传递给docker build：

docker build  --build-arg RAILS_MASTER_KEY=${RAILS_MASTER_KEY} ...

出于安全原因，我绝对不建议在项目本身中包含config/master.key，这就是为什么我会使用 ENV 变量。

在这种情况下，您似乎正在使用 Elastic Beanstalk“自动构建”（这意味着 Docker 映像是在您的源代码的每次部署上构建的），因此您无需手动构建映像。这可以通过使用 eb setenv RAILS_MASTER_KEY=XXXXXXXX 或从 AWS Web 控制台添加 RAILS_MASTER_KEY 环境变量来解决。