flask-redis

Compose sample application

Use with Docker Development Environments

You can open this sample in the Dev Environments feature of Docker Desktop version 4.12 or later.

Open in Docker Dev Environments

Python/Flask application using a Redis database

Project structure:

.
├── Dockerfile
├── README.md
├── app.py
├── compose.yaml
└── requirements.txt

compose.yaml

services:
   redis: 
     image: redislabs/redismod
     ports:
       - '6379:6379' 
   web:
        build: .
        ports:
            - "8000:8000"
        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             0.0.0.0:8000->8000/tcp

After the application starts, navigate to http://localhost:8000 in your web browser or run:

$ curl localhost:8000
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