我试图在redis中保存python应用程序的数据，但是当我停止docker compose文件时，数据将被删除，当我再次运行docker compose文件时，它将从头开始。我想保存容器的数据，无论何时启动，它都从容器退出时离开的位置开始。例如，当我退出容器时，它显示 Hello World! I have been seen b'6' times. 当我重新启动容器时，它应该从 Hello World! I have been seen b'6' times. ```
version: "3.7"

services:
nginx_app:
image: nginx:latest
depends_on:
- flask_app
volumes:
- ./default.conf:/etc/nginx/conf.d/default.conf
ports:
- 8082:80
networks:
- my_project_network

flask_app:
build:
context: .
dockerfile: Dockerfile
expose:
- 5000
depends_on:
- redis_app
networks:
- my_project_network

redis_app:
image: redis:latest
command: redis-server --requirepass 1234
volumes:
- ./redis-vol:/data
expose:
- 6379
networks:
- my_project_network

networks:
my_project_network:
external: true

python文件：

from flask import Flask
from redis import Redis
app = Flask(name)
redis = Redis(host='redis_app', port=6379, password='123a')
@app.route('/')
def hello():
redis.incr('hits')
return 'Hello World! I have been seen %s times.' % redis.get('hits')
if name == "main":
app.run(host="0.0.0.0", debug=True)