docker 容器上的连接被拒绝 [英] Connection refused on docker container

问题描述

我是 Docker 的新手，正在尝试制作一个演示 Rails 应用程序.我制作了一个如下所示的 dockerfile:

I'm new to Docker and trying to make a demo Rails app. I made a dockerfile that looks like this:

FROM ruby:2.2
MAINTAINER [e-mail]

# 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 8080 to the Docker host, so we can access it 
# from the outside.
EXPOSE 8080

# 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", "-p", "8080"]

然后我像这样构建它:

docker build -t demo . 

并调用一个命令来启动服务器，该服务器在端口 8080 上启动服务器:

And call a command to start the server which does start the server on port 8080:

Johns-MacBook-Pro:demo johnkealy$ docker run -it demo
=> Booting WEBrick
=> Rails 4.2.5 application starting in development on http://0.0.0.0:8080
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
[2016-04-23 16:50:34] INFO  WEBrick 1.3.1
[2016-04-23 16:50:34] INFO  ruby 2.2.4 (2015-12-16) [x86_64-linux]
[2016-04-23 16:50:34] INFO  WEBrick::HTTPServer#start: pid=1 port=8080

然后我尝试找到要导航到的正确 IP:

I then try to find the correct IP to navigate to:

Johns-MacBook-Pro:demo johnkealy$ docker-machine ip default
192.168.99.100

我导航到 http://192.168.99.100:8080 并收到错误此站点不能到达 192.168.99.100 拒绝连接.

I navigate to http://192.168.99.100:8080 and get the error This site can’t be reached 192.168.99.100 refused to connect.

我可能做错了什么?

推荐答案

您需要使用以下选项发布暴露的端口:

You need to publish the exposed ports by using the following options:

-P(大写)或 --publish-all 会告诉 Docker 使用来自主机的随机端口并将它们映射到公开容器的端口.

-P (upper case) or --publish-all that will tell Docker to use random ports from your host and map them to the exposed container's ports.

-p(小写)或 --publish=[] 将告诉 Docker 使用您手动设置的端口并将它们映射到公开容器的端口.

-p (lower case) or --publish=[] that will tell Docker to use ports you manually set and map them to the exposed container's ports.

首选第二个选项，因为您已经知道映射了哪些端口.如果您使用第一个选项，那么您将需要调用 docker inspect demo 并在 Ports 部分检查您的主机正在使用哪些随机端口.

The second option is preferred because you already know which ports are mapped. If you use the first option then you will need to call docker inspect demo and check which random ports are being used from your host at the Ports section.

只需运行以下命令:

docker run -it -p 8080:8080 demo

之后您的网址就可以使用了.

After that your url will work.

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