Initial commit. No idea if it works

Dockerfile

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+FROM python:3.5
+
+COPY requirements.txt /tmp/requirements.txt
+RUN pip install -r /tmp/requirements.txt
+ADD src/ /src
+WORKDIR /src
+EXPOSE 5000

Dockerfile.nginx

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+FROM nginx
+
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80

docker-compose.yml

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+version: "2"
+services:
+  revproxy:
+    build:
+      context: "."
+      file: "Dockerfile.nginx"
+    links:
+      - "web"
+    ports:
+      - "80:80"
+  web:
+    build:
+      context: "."
+      file: "Dockerfile"
+    command: "FLASK_APP=app.py flask run --host 0.0.0.0" 

nginx.conf

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+server{
+    listen 80;
+    location / {
+        proxy_pass web:5000
+    }
+}

requirements.txt

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+click==6.7
+Flask==1.0.2
+itsdangerous==0.24
+Jinja2==2.10
+MarkupSafe==1.0
+Werkzeug==0.14.1

src/app.py

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+from flask import Flask
+app = Flask(__name__)
+
+@app.route('/')
+def hello_world():
+    return 'Hello, World!'