容器化一个Ruby on Rails应用程序

先决条件

您已安装最新版本的 Docker Desktop。
您有一个 Git客户端。本节中的示例展示了Git CLI，但您可以使用任何客户端。

获取示例应用程序

示例应用程序使用了流行的 Ruby on Rails 框架。

克隆示例应用程序以与本指南一起使用。打开终端，将目录更改为您想要工作的目录，并运行以下命令来克隆存储库：

$ git clone https://github.com/falconcr/docker-ruby-on-rails.git

初始化 Docker 资源

现在你已经有了一个应用程序，你可以创建必要的Docker资源来容器化你的应用程序。你可以使用Docker Desktop内置的Docker Init功能来帮助简化这个过程，或者你也可以手动创建这些资源。

docker init，用于为项目引导Docker相关资产的命令，目前还不支持Ruby编程语言。这意味着如果你正在使用Ruby，你需要手动创建Dockerfiles和其他相关配置。

在docker-ruby-on-rails目录中，创建以下文件：

创建一个名为 Dockerfile 的文件，内容如下。

Dockerfile

# syntax=docker/dockerfile:1

# Use the official Ruby image with version 3.2.0
FROM ruby:3.2.0

# Install dependencies
RUN apt-get update -qq && apt-get install -y \
  nodejs \
  postgresql-client \
  libssl-dev \
  libreadline-dev \
  zlib1g-dev \
  build-essential \
  curl

# Install rbenv
RUN git clone https://github.com/rbenv/rbenv.git ~/.rbenv && \
  echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc && \
  echo 'eval "$(rbenv init -)"' >> ~/.bashrc && \
  git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build && \
  echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc

# Install the specified Ruby version using rbenv
ENV PATH="/root/.rbenv/bin:/root/.rbenv/shims:$PATH"
RUN rbenv install 3.2.0 && rbenv global 3.2.0

# Set the working directory
WORKDIR /myapp

# Copy the Gemfile and Gemfile.lock
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock

# Install Gems dependencies
RUN gem install bundler && bundle install

# Copy the application code
COPY . /myapp

# Precompile assets (optional, if using Rails with assets)
RUN bundle exec rake assets:precompile

# Expose the port the app runs on
EXPOSE 3000

# Command to run the server
CMD ["rails", "server", "-b", "0.0.0.0"]

创建一个名为 compose.yaml 的文件，内容如下。

compose.yaml

services:
  web:
    build: .
    command: bundle exec rails s -b '0.0.0.0'
    volumes:
      - .:/myapp
    ports:
      - "3000:3000"

创建一个名为 .dockerignore 的文件，内容如下。

.dockerignore

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git
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