Compose app skeletons

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

samples/nginx-flask-mongo/docker-compose.yaml

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+version: "3"
+services:
+  web:
+    image: nginx
+    volumes:
+      - ./nginx/nginx.conf:/tmp/nginx.conf
+    environment: 
+      - FLASK_SERVER_ADDR=backend:9091  
+    command: /bin/bash -c "envsubst < /tmp/nginx.conf > /etc/nginx/conf.d/default.conf && nginx -g 'daemon off;'" 
+    ports:
+    - 8080:80
+    depends_on:
+    - backend
+  backend:
+    build: flask
+    environment: 
+    - FLASK_SERVER_PORT=9091
+    volumes:
+    - ./flask:/src
+    depends_on:
+      -  mongo  
+  mongo:
+    image: mongo

samples/nginx-flask-mongo/flask/Dockerfile

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+FROM python:3.7
+
+WORKDIR /src
+COPY . .
+RUN pip install -r requirements.txt
+
+CMD ["./server.py"]

samples/nginx-flask-mongo/flask/requirements.txt

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+pymongo
+flask

samples/nginx-flask-mongo/flask/server.py

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+#!/usr/bin/env python
+import os
+
+from flask import Flask
+from pymongo import MongoClient
+
+app = Flask(__name__)
+
+client = MongoClient("mongo:27017")
+
+@app.route('/')
+def todo():
+    try:
+        client.admin.command('ismaster')
+    except:
+        return "Server not available"
+    return "Hello fom the MongoDB client!\n"
+
+
+if __name__ == "__main__":
+    app.run(host='0.0.0.0', port=os.environ.get("FLASK_SERVER_PORT", 9090), debug=True)
+

samples/nginx-flask-mongo/nginx/nginx.conf

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+server {
+  listen 80;
+  location / {
+    proxy_pass http://$FLASK_SERVER_ADDR;
+  }
+}