yml的基本語法結構:
services: # 容器
servicename: # 服務名字,這個名字也是內部 bridge網絡可以使用的 DNS name
image: # 鏡像的名字
command: # 可選,如果設置,則會覆蓋默認鏡像裡的 CMD命令
environment: # 可選,相當於 docker run裡的 --env
volumes: # 可選,相當於docker run裡的 -v
networks: # 可選,相當於 docker run裡的 --network
ports: # 可選,相當於 docker run裡的 -p
servicename2:
volumes: # 可選,相當於 docker volume create
networks: # 可選,相當於 docker network create
- services
對照:Compose and Docker compatibility - servicename
與前一篇在docker時下指令的–name flask-demo 一致
練習
以Python Flask+Redis(練習):為例子,改造成一個docker-compose文件
app.py檔案內容如下:
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_world():
return 'hello'
if __name__ == "__main__":
app.run(debug=True, host='0.0.0.0', port=5000)
dockerfile如下:
FROM python:3.9.5-slim
RUN pip install flask redis && \
groupadd -r flask && useradd -r -g flask flask && \
mkdir /src && \
chown -R flask:flask /src
USER flask
COPY app.py /src/app.py
WORKDIR /src
ENV FLASK_APP=app.py REDIS_HOST=redis
EXPOSE 5000
CMD ["flask", "run", "-h", "0.0.0.0"]
docker-compose.yml內容如下:
version: "3.8"
services:
flask-demo:
image: flask-demo:latest
environment:
- REDIS_HOST=redis-server
networks:
- demo-network
ports:
- 8899:5000
redis-server:
image: redis:latest
networks:
- demo-network
networks:
demo-network: null
- 資料結構
.
├── app.py
├── docker-compose.yml
└── dockerfile
- 建立2個image
- 下載redis image
docker image pull redis
- 建立flask-demo的image
docker image build -t flask-demo .
- 運行docker-compose
$ docker-compose up
Creating network "my_flask_demo-network" with the default driver
Creating my_flask_redis-server_1 ... done
Creating my_flask_flask-demo_1 ... done
Attaching to my_flask_redis-server_1, my_flask_flask-demo_1
redis-server_1 | 1:C 31 Jan 2022 12:26:05.447 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis-server_1 | 1:C 31 Jan 2022 12:26:05.447 # Redis version=6.2.6, bits=64, commit=00000000, modified=0, pid=1, just started
redis-server_1 | 1:C 31 Jan 2022 12:26:05.447 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
redis-server_1 | 1:M 31 Jan 2022 12:26:05.447 * monotonic clock: POSIX clock_gettime
redis-server_1 | 1:M 31 Jan 2022 12:26:05.448 * Running mode=standalone, port=6379.
redis-server_1 | 1:M 31 Jan 2022 12:26:05.448 # Server initialized
redis-server_1 | 1:M 31 Jan 2022 12:26:05.449 * Ready to accept connections
flask-demo_1 | * Serving Flask app 'app.py' (lazy loading)
flask-demo_1 | * Environment: production
flask-demo_1 | WARNING: This is a development server. Do not use it in a production deployment.
flask-demo_1 | Use a production WSGI server instead.
flask-demo_1 | * Debug mode: off
flask-demo_1 | * Running on all addresses.
flask-demo_1 | WARNING: This is a development server. Do not use it in a production deployment.
flask-demo_1 | * Running on http://172.25.0.3:5000/ (Press CTRL+C to quit)
打開瀏覽器輸入
127.0.0.1:8899
![](https://i.imgur.com/pES3Goo.png)