1. 安裝Docker Compose
- sudo curl -L https://github.com/docker/compose/releases/download/1.20.0/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
- sudo chmod +x /usr/local/bin/docker-compose
- docker-compose version
2. 創建第一個demo
- 創建一個用來放置項目的文件夾 ,並切換到此目錄下:
mkdir composetest
cd composetest/
- 依次創建以下4個文件並編輯內容:
(1) touch app.py
vim app.py
【內容】
import time
import redis
from flask import Flask
app = Flask(__name__)
cache = redis.Redis(host='redis', port=6379)
def get_hit_count():
retries = 5
while True:
try:
return cache.incr('hits')
except redis.exceptions.ConnectionError as exc:
if retries == 0:
raise exc
retries -= 1
time.sleep(0.5)
@app.route('/')
def hello():
count = get_hit_count()
return 'Hello World! I have been seen {} times.\n'.format(count)
if __name__ == "__main__":
app.run(host="0.0.0.0", debug=True)
(2)touch requirements.txt
vim requirements.txt
【內容】
flask
redis
(3)touch Dockerfile
vim Dockerfile
【內容】
FROM python:3.4-alpine
ADD . /code
WORKDIR /code
RUN pip install -r requirements.txt
CMD ["python", "app.py"]
(4)touch docker-compose.yml
vim docker-compose.yml
【內容】
version: '2'
services:
web:
build: .
command: python app.py
ports:
- "5000:5000"
volumes:
- .:/code
redis:
image: "redis:alpine"
- 至此已經構建好了demo的目錄,使用命令啓動 sudo docker-compose up
- 啓動後查看容器的IP地址sudo docker inspect composetest_web_1 | grep IPAddress 其中composetest_web_1爲容器的名稱name,可以使用sudo docker ps查看。
- 根據IP地址及端口在瀏覽器中訪問(端口5000是上面docker-compose.yml文件中配置的,我這裏容器地址是172.18.0.3),可以看到如下效果