Added Flask/Redis

Signed-off-by: ajeetraina <ajeetraina@gmail.com>

flask-redis/Dockerfile

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+FROM python
+ADD . /code
+WORKDIR /code
+RUN pip install -r requirements.txt
+CMD python app.py

flask-redis/README.md

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+## Compose sample application
+### Python/Flask application
+
+Project structure:
+```
+.
+├── docker-compose.yaml
+├── app
+    ├── Dockerfile
+    ├── requirements.txt
+    └── app.py
+
+```
+
+[_docker-compose.yaml_](docker-compose.yaml)
+```
+services: 
+  web: 
+    build: app 
+    ports: 
+      - '5000:5000'
+```
+
+## Deploy with docker-compose
+
+```
+$ docker-compose up -d
+Creating network "flask_default" with the default driver
+Building web
+Step 1/6 : FROM python:3.7-alpine
+...
+...
+Status: Downloaded newer image for python:3.7-alpine
+Creating flask_web_1 ... done
+
+```
+
+## Expected result
+
+Listing containers must show one container running and the port mapping as below:
+```
+$ docker ps
+CONTAINER ID        IMAGE                        COMMAND                  CREATED             STATUS              PORTS                  NAMES
+c126411df522        flask_web                    "python3 app.py"         About a minute ago  Up About a minute   0.0.0.0:5000->5000/tcp flask_web_1
+```
+
+After the application starts, navigate to `http://localhost:5000` in your web browser or run:
+```
+$ curl localhost:5000
+Hello World!
+```
+
+Stop and remove the containers
+```
+$ docker-compose down
+```

flask-redis/app.py

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+# compose_flask/app.py
+from flask import Flask
+from redis import Redis
+
+app = Flask(__name__)
+redis = Redis(host='redis', port=6379)
+
+@app.route('/')
+def hello():
+    redis.incr('hits')
+    return 'This webpage has been viewed %s time(s).' % redis.get('hits')
+
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", debug=True)

flask-redis/app/Dockerfile

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+FROM python:3.7-alpine 
+WORKDIR /app 
+COPY requirements.txt /app
+RUN pip3 install -r requirements.txt --no-cache-dir
+COPY . /app 
+ENTRYPOINT ["python3"] 
+CMD ["app.py"]

flask-redis/app/app.py

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+from flask import Flask
+app = Flask(__name__)
+
+@app.route('/')
+def hello():
+	return "Hello World!"
+
+if __name__ == '__main__':
+	app.run(host='0.0.0.0')

flask-redis/app/requirements.txt

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+flask

flask-redis/docker-compose.yaml

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+services:
+  web: 
+    build: app 
+    ports: 
+      - '5000:5000'

flask-redis/docker-compose.yml

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+version: '2'
+services:
+   redis: 
+     image: redislabs/redismod
+     ports:
+       - '6379:6379' 
+   web:
+        build: .
+        ports:
+            - "5000:5000"
+        volumes:
+            - .:/code
+        depends_on:
+            - redis

flask-redis/requirements.txt

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+flask
+redis