docker_practice/compose/usage.md

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## 使
###
* (`service`)
* (`project`)
`Compose`
###
web web
`Python` 访 web
#### web
`app.py`
```python
from flask import Flask
from redis import Redis
app = Flask(__name__)
redis = Redis(host='redis', port=6379)
@app.route('/')
def hello():
count = redis.incr('hits')
return 'Hello World! 该页面已被访问 {} 次。\n'.format(count)
if __name__ == "__main__":
app.run(host="0.0.0.0", debug=True)
```
#### Dockerfile
`Dockerfile`
```dockerfile
FROM python:3.6-alpine
ADD . /code
WORKDIR /code
RUN pip install redis flask
CMD ["python", "app.py"]
```
#### docker-compose.yml
`docker-compose.yml` Compose 使
```yaml
version: '3'
services:
web:
build: .
ports:
- "5000:5000"
redis:
image: "redis:alpine"
```
#### compose
```bash
$ docker-compose up
```
访 `5000` 1