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 Flaskapp = 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;
# DockerfileFROM 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 perfektimprezy1c50b67d45b1a4feade72276394811c8399b1b95692e0914ee72b103ff54c769
它真的在运行吗?
$> sudo docker psCONTAINER 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 1c50b67d45b1UID 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 bashroot@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()
至
if __name__ == '__main__': app.run(host='0.0.0.0')
它应该工作。
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