Python-在Docker中部署最小化Flask应用-服务器连接问题

我有一个唯一依赖的应用程序是flask,它可以在docker外部正常运行并绑定到默认端口5000。这是完整的源代码:

from flask import Flask

app = Flask(__name__)

app.debug = True

@app.route('/')

def main():

return 'hi'

if __name__ == '__main__':

app.run()

问题是,当我在docker中部署此服务器时,服务器正在运行,但无法从容器外部访问。

以下是我的Dockerfile。该图像是装有烧瓶的ubuntu。焦油仅包含index.py上面列出的内容;

# Dockerfile

FROM dreen/flask

MAINTAINER dreen

WORKDIR /srv

# Get source

RUN mkdir -p /srv

COPY perfektimprezy.tar.gz /srv/perfektimprezy.tar.gz

RUN tar x -f perfektimprezy.tar.gz

RUN rm perfektimprezy.tar.gz

# Run server

EXPOSE 5000

CMD ["python", "index.py"]

这是我正在部署的步骤

$> sudo docker build -t perfektimprezy .

据我所知,上面的程序运行良好,图像中包含tar的内容/srv。现在,让我们在容器中启动服务器:

$> sudo docker run -i -p 5000:5000 -d perfektimprezy

1c50b67d45b1a4feade72276394811c8399b1b95692e0914ee72b103ff54c769

它真的在运行吗?

$> sudo docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

1c50b67d45b1 perfektimprezy:latest "python index.py" 5 seconds ago Up 5 seconds 0.0.0.0:5000->5000/tcp loving_wozniak

$> sudo docker logs 1c50b67d45b1

* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

* Restarting with stat

  • 是的,好像flask服务器正在运行。这是奇怪的地方。让我们向服务器发出请求:

 $> curl 127.0.0.1:5000 -v

* Rebuilt URL to: 127.0.0.1:5000/

* Hostname was NOT found in DNS cache

* Trying 127.0.0.1...

* Connected to 127.0.0.1 (127.0.0.1) port 5000 (#0)

> GET / HTTP/1.1

> User-Agent: curl/7.35.0

> Host: 127.0.0.1:5000

> Accept: */*

>

* Empty reply from server

* Connection #0 to host 127.0.0.1 left intact

curl: (52) Empty reply from server

空回复…但是该流程正在运行吗?

$> sudo docker top 1c50b67d45b1

UID PID PPID C STIME TTY TIME CMD

root 2084 812 0 10:26 ? 00:00:00 python index.py

root 2117 2084 0 10:26 ? 00:00:00 /usr/bin/python index.py

现在,让我们进入服务器并检查…

$> sudo docker exec -it 1c50b67d45b1 bash

root@1c50b67d45b1:/srv# netstat -an

Active Internet connections (servers and established)

Proto Recv-Q Send-Q Local Address Foreign Address State

tcp 0 0 127.0.0.1:5000 0.0.0.0:* LISTEN

tcp 0 0 127.0.0.1:47677 127.0.0.1:5000 TIME_WAIT

Active UNIX domain sockets (servers and established)

Proto RefCnt Flags Type State I-Node Path

root@1c50b67d45b1:/srv# curl -I 127.0.0.1:5000

HTTP/1.0 200 OK

Content-Type: text/html; charset=utf-8

Content-Length: 5447

Server: Werkzeug/0.10.4 Python/2.7.6

Date: Tue, 19 May 2015 12:18:14 GMT

回答:

问题是你只绑定到localhost接口,0.0.0.0如果要从外部访问容器,则应该绑定到。如果你更改:

if __name__ == '__main__':

app.run()

if __name__ == '__main__':

app.run(host='0.0.0.0')

它应该工作。

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