Nginx/Node/Redis and Flask/Redis Compose example (#222)

* Added Node, Nginx and Redis Project
* Added Flask/Redis

flask-redis/Dockerfile

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+FROM python:3.11.0a6-alpine3.15
+WORKDIR /code
+COPY requirements.txt /code
+RUN pip install -r requirements.txt --no-cache-dir
+COPY . /code
+CMD python app.py

flask-redis/README.md

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+## Compose sample application
+
+### Python/Flask application using a Redis database
+
+Project structure:
+
+```
+.
+├── Dockerfile
+├── README.md
+├── app.py
+├── docker-compose.yml
+└── requirements.txt
+```
+
+[_docker-compose.yml_](docker-compose.yml)
+
+```
+services:
+   redis: 
+     image: redislabs/redismod
+     ports:
+       - '6379:6379' 
+   web:
+        build: .
+        ports:
+            - "5000:5000"
+        volumes:
+            - .:/code
+        depends_on:
+            - redis
+```
+
+## Deploy with docker-compose
+
+```
+$ docker-compose up -d
+[+] Running 24/24
+ ⠿ redis Pulled   
+ ...                                                                                                                                                                                                                                                                                                                                                                                                             
+   ⠿ 565225d89260 Pull complete                                                                                                                                                                                                      
+[+] Building 12.7s (10/10) FINISHED
+ => [internal] load build definition from Dockerfile                                                                                                                                                                                  ...
+[+] Running 3/3
+ ⠿ Network flask-redis_default    Created                                                                                                                                                                                             
+ ⠿ Container flask-redis-redis-1  Started                                                                                                                                                                                             
+ ⠿ Container flask-redis-web-1    Started
+```
+
+## Expected result
+
+Listing containers must show one container running and the port mapping as below:
+```
+
+$ docker-compose ps
+NAME                  COMMAND                  SERVICE             STATUS              PORTS
+flask-redis-redis-1   "redis-server --load…"   redis               running             0.0.0.0:6379->6379/tcp
+flask-redis-web-1     "/bin/sh -c 'python …"   web                 running             0.0.0.0:5000->5000/tcp
+```
+
+After the application starts, navigate to `http://localhost:5000` in your web browser or run:
+```
+$ curl localhost:5000
+This webpage has been viewed 2 time(s)
+```
+
+## Monitoring Redis keys
+
+Connect to redis database by using ```redis-cli``` command and monitor the keys.
+```
+redis-cli -p 6379
+127.0.0.1:6379> monitor
+OK
+1646634062.732496 [0 172.21.0.3:33106] "INCRBY" "hits" "1"
+1646634062.735669 [0 172.21.0.3:33106] "GET" "hits"
+```
+
+
+Stop and remove the containers
+```
+$ docker-compose down
+```

flask-redis/app.py

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+from flask import Flask
+from redis import Redis
+
+app = Flask(__name__)
+redis = Redis(host='redis', port=6379)
+
+@app.route('/')
+def hello():
+    redis.incr('hits')
+    counter = str(redis.get('hits'),'utf-8')
+    return "This webpage has been viewed "+counter+" time(s)"
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", debug=True)

flask-redis/docker-compose.yml

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+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