Question

我是Docker的新手，并试图制作一个演示Rails应用程序。我创建了一个看起来像这样的dockerfile：

FROM ruby:2.2 

# Install apt based dependencies required to run Rails as 
# well as RubyGems. As the Ruby image itself is based on a 
# Debian image, we use apt-get to install those.
RUN apt-get update && apt-get install -y \ 
  build-essential \ 
  nodejs

# Configure the main working directory. This is the base 
# directory used in any further RUN, COPY, and ENTRYPOINT 
# commands.
RUN mkdir -p /app 
WORKDIR /app

# Copy the Gemfile as well as the Gemfile.lock and install 
# the RubyGems. This is a separate step so the dependencies 
# will be cached unless changes to one of those two files 
# are made.
COPY Gemfile Gemfile.lock ./ 
RUN gem install bundler && bundle install --jobs 20 --retry 5

# Copy the main application.
COPY . ./

# Expose port 3000 to the Docker host, so we can access it 
# from the outside.
EXPOSE 3000

# The main command to run when the container starts. Also 
# tell the Rails dev server to bind to all interfaces by 
# default.
CMD ["bundle", "exec", "rails", "server", "-b", "0.0.0.0"]

然后我构建它（没有错误）：

docker build -t demo .

然后运行它（也没有错误）：

docker run -itP demo
=> Booting Puma
=> Rails 5.1.1 application starting in development on http://0.0.0.0:3000
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.8.2 (ruby 2.2.7-p470), codename: Sassy Salamander
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:9292
Use Ctrl-C to stop

当我在一个单独的终端中运行docker ps命令以确定端口时，我得到：

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                     NAMES
55e8224f7c15        demo                "bundle exec rails..."   About an hour ago   Up About an hour    0.0.0.0:32772->3000/tcp   ecstatic_bohr

但是，当我尝试使用Chrome或curl命令在http://localhost:32772或http://192.168.99.100:32772连接到它时，我收到“拒绝连接”。

当我通过bundle exec rails server命令在本地计算机上的docker之外运行应用程序时，它运行正常。请注意，我在Win7机器上使用Docker Toolbox

我可能做错了什么？

Answer 1

我也花了几个小时，这个thread真的很有帮助。我现在正在做的是通过vm的ip地址访问这些服务。

您可以运行您的虚拟机地址：

docker-machine ls

然后尝试使用主机映射端口37772访问您的服务，如下所示：

http://<VM IP ADDRESS>:32772

希望这有帮助。

Answer 2

上述技巧的结合起作用了 -

我不得不使用http://<VM IP ADDRESS>:32772（localhost：32772不起作用），而且我必须修复暴露的端口以匹配9292的TCP侦听端口。

我仍然不明白为什么TCP监听端口默认为9292而不是3000，但我会分别研究它。

感谢您的帮助！

由docker容器ERR_CONNECTION_REFUSED

2 个答案: