Docker-无法连接到本地主机端口4000：连接被拒绝 [英] Docker - Failed to connect to localhost port 4000: Connection refused
问题描述
我是Docker的新手，我想通过遵循官方网站上的教程来熟悉Docker。现在，我陷入了教程的第2部分（您可以在此处查看链接=> https://docs.docker.com/get-started/part2/#run-the-app ）
Hi I'm very new to Docker, I'm trying to get familiar with Docker by following the tutorial on official site. Now I get stuck at part 2 of the tutorial (where you can check up the link here => https://docs.docker.com/get-started/part2/#run-the-app)
我有示例应用程序代码，Dockerfile和requirements.txt与官方教程完全相同
I have sample application code, Dockerfile, and requirements.txt exactly same as the offical tutorial
$ ls
app.py Dockerfile requriements.txt
我的Dockerfile看起来像这样
My Dockerfile looks like this
FROM python:2.7-slim
WORKDIR /app
ADD . /app
RUN pip install -r requriements.txt
EXPOSE 80
ENV NAME World
CMD ["python", "app.py"]
所有3个文件的文件内容/代码都与本教程完全相同。我能够使用此命令构建映像注册表
All 3 files have file content/code exactly same as the tutorial also. I was able to build image registry with this command
$ docker build -t friendlyhello .
一切看起来都很不错。现在我有示例项目图像注册表。
Everything looks great. Now I had sample project image registry.
$ docker images
REPOSITORY TAG IMAGE ID CREATED
friendlyhello latest 82b8a0b52e91 39 minutes ago
python 2.7-slim 1c7128a655f6 5 days ago
hello-world latest 48b5124b2768 4 months ago
然后我使用此命令根据官方教程运行应用程序
I then ran the app according to the official tutorial with this command
$ docker run -d -p 4000:80 friendlyhello
c1893f7eea9f1b708f639653b8eba20733d8a45d3812b442bc295b43c6c7dd5c
编辑：这是在执行上述命令后我的容器
Edit: This is my container after ran above command
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS
c1893f7eea9f friendlyhello "python app.py" 15 minutes ago Up 16 minutes
官方教程指导读者看一下 http：// localhost：4000 ，因为他们已经映射了机器端口 4000 到容器端口 80
And the official tutorial guides readers to have a look at http://localhost:4000 as they have already mapped machine port 4000 to container port 80
不幸的是，我无法从该URL得到任何响应。
Unfortunately, I couldn't get any response from that URL.
$ curl http://localhost:4000
curl: (7) Failed to connect to localhost port 4000: Connection refused
我是新手，我也不知道该怎么办...。如何我上班了吗？
预先感谢您的任何答复。
I'm totally newbie and I have no idea what to do....How can I get it to work ? Thanks in advance for any response.
编辑：我按照@ johnharris85的建议进行操作。下面是输出
Edit: I did as @johnharris85 suggested. Below is the output
$ curl http://$(echo docker-machine ip default):4000
curl: (6) Couldn't resolve host 'docker-machine'
curl: (6) Couldn't resolve host 'ip'
curl: (6) Couldn't resolve host 'default'
似乎也不起作用。
编辑：@ johnharris85更正了他的建议，@ user8023051阐明了此命令的来源以及幕后的情况。它现在正在工作:)谢谢
Edit: @johnharris85 corrected his suggestion and @user8023051 clarify how this command come from and what is going on under the hood. It is working now :) Thanks
$ curl http://$(docker-machine ip default):4000
<h3>Hello World!</h3><b>Hostname:</b> c1893f7eea9f<br/><b>Visits:</b> <i>cannot connect to Redis, counter disabled</i>
推荐答案
我对docker不太熟悉，但是它听起来您的设置是这样的：您的docker实例正在虚拟机中运行，并且您正尝试从Windows计算机访问绑定到localhost（即vm）的应用程序。您会在curl上被拒绝的原因是，实际上在主机（Windows）的端口4000上没有监听。
I'm not very familiar with docker, but it sounds like your setup is such that your docker instance is running in a virtual machine, and you're trying to access an application bound to localhost (the vm) from your Windows machine. The reason you would get a refusal here from curl is because nothing is actually listening on port 4000 on the host (Windows).
尝试通过以下方式查找您的Docker实例正在使用的IP：
Try to find the IP that your docker instance is using by:
$ docker-machine ip default
现在您知道IP地址，请再次尝试curl。您甚至可以像下面这样在命令中对其进行求值：
Now that you know the IP address, try curl again. You can even have it evaluated within the command like so:
$ curl http：// $（docker-machine ip默认值）：4000
这篇关于Docker-无法连接到本地主机端口4000：连接被拒绝的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
