如何在Docker容器中运行Python Flask [英] How to run Python Flask within a Docker container
问题描述
我正在尝试在docker容器中运行Python Flask网络服务器，但无法从外部连接到Flask服务器。
I'm trying to run a Python Flask webserver within a docker container, but I can't connect to the Flask server from the outside.
我做了什么：
我创建了 /temp/HelloFlask.py
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "Hello World!"
if __name__ == "__main__":
app.run()
我启动了Docker容器，将容器端口5000映射到主机端口5000并将〜/ temp安装到/ temp
I started the docker container with container port 5000 mapped to host port 5000 and with ~/temp mounted to /temp
docker run -it -p 5000:5000 -v ~/temp:/temp --name tf gcr.io/tensorflow/tensorflow:latest-devel
在运行的Docker容器中，我安装了Flask并运行 HelloFlask.py
Inside the running docker container, I installed Flask and ran HelloFlask.py
cd /temp
pip install Flask
python HelloFlask.py &
我确认服务器可以在容器中访问
I validated that the server was accessible within the container
[root@de8b6996b540:/temp# curl localhost:5000
127.0.0.1 - - [22/Sep/2016 17:41:48] "GET / HTTP/1.1" 200 -
Hello World!
我正在使用Docker 1.12.1版（内部版本：12133），该容器暴露了以下容器端口localhost，因此我应该能够在Mac上的容器外部访问 localhost：5000 ，但无法连接。
I'm using Docker Version 1.12.1 (build: 12133), which exposes the container ports on localhost, so I should be able to access localhost:5000 on my Mac, outside the container, but I can't connect.
我进行了测试，以确保Docker通过运行nginx容器（如用于Mac快速入门的docker ，我可以通过本地主机从容器访问端口。
I tested to make sure that Docker was correctly binding container ports to localhost by running an nginx container as described in the docker for mac quickstart, and I can access ports from the container via localhost just fine.
推荐答案
尝试 app.run（host ='0.0.0.0'）。
默认情况下，Flask服务器仅可从本地主机访问。在您的情况下，容器是本地主机，并且您的请求是从容器外部发出的。 host ='0.0.0.0'参数使服务器可以从外部IP访问。 Flask文档中有详细描述。
By default, Flask server is only accessible from the localhost. In your case, the container is the localhost, and your requests are originating from outside the container. host='0.0.0.0' parameter makes the server accessible from external IPs. It's described in Flask documentation in detail.
这篇关于如何在Docker容器中运行Python Flask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！
