Docker Compose安装和使用

一、安装

运行以下命令下载Docker Compose

curl -L https://get.daocloud.io/docker/compose/releases/download/1.29.2/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose

对二进制文件应用可执行权限

[[email protected] composetest]# chmod +x /usr/local/bin/docker-compose

查看docker-compose版本

[[email protected] composetest]# docker-compose -v
docker-compose version 1.29.2, build 5becea4c

 

二、使用

1.为项目创建一个目录

[[email protected] ~]# mkdir /composetest
[[email protected] composetest]# cd /composetest

2.在项目目录下创建一个名为app.py的文件

[[email protected] composetest]# cat app.py 
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)

3.在项目目录下创建一个requirements.txt的文件

[[email protected] composetest]# cat requirements.txt 
flask
redis

4.在项目目录下创建一个Dockerfile

[[email protected] composetest]# cat Dockerfile 
# syntax=docker/dockerfile:1
FROM python:3.7-alpine
WORKDIR /code
ENV FLASK_APP=app.py
ENV FLASK_RUN_HOST=0.0.0.0
RUN apk add --no-cache gcc musl-dev linux-headers
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
EXPOSE 5000
COPY . .
CMD ["flask", "run"]

5.在项目目录中创建一个docker-compose.yml文件

[[email protected] composetest]# cat docker-compose.yml 
version: "3.9"
services:
  web:
    build: .
    ports:
      - "5000:5000"
  redis:
    image: "redis:alpine"
    ports:
      - "6379:6379"

6.使用compose启动应用程序

[[email protected] composetest]# docker-compose up -d

7.测试启动的应用程序

[[email protected] ~]# curl 192.168.10.230:5000
Hello World! I have been seen 5 times.