Docker Compose
Docker Compose来轻松高效的管理容器,定义运行多个容器
官网介绍
定义,运行多个容器
YAML file配置文件
single command 命令有哪些
步骤:(批量服务编排)
- DockerFile保证我们的项目在任何地方可以运行
- docker-compose.yml 这个文件怎么写
- 启动项目
compose是Docker官方的开源项目,需要安装
- 服务service,容器,应用
- 项目project。一组关联的容器
Dockerfile
让程序在任何地方运行
安装
-
下载
curl -L https://get.daocloud.io/docker/compose/releases/download/1.24.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose chmod +x /usr/local/bin/docker-compose docker-compose --version
-
体验
mkdir composetest cd composetest
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)
requirements.txt
flask redis
dockerfile
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"]
docker-compose.yml
version: "3.9" services: web: build: . ports: - "5000:5000" volumes: - .:/code environment: FLASK_ENV: development redis: image: "redis:alpine"
docker-compose up
-
多个服务器,集群。A,B -num 副本数量
-
网络规则
- 项目中的内容都在同一个网络
YAML文件规则
docker-compose.yml 核心
# 3层
version: # 版本
service: #服务
#其他配置
多写多看
实战
-
mkdir my_wordpress; cd my_wordpress
-
docker-compose.yml
version: "3.9" services: db: image: mysql:5.7 volumes: - db_data:/var/lib/mysql restart: always environment: MYSQL_ROOT_PASSWORD: somewordpress MYSQL_DATABASE: wordpress MYSQL_USER: wordpress MYSQL_PASSWORD: wordpress wordpress: depends_on: - db image: wordpress:latest ports: - "8000:80" restart: always environment: WORDPRESS_DB_HOST: db:3306 WORDPRESS_DB_USER: wordpress WORDPRESS_DB_PASSWORD: wordpress WORDPRESS_DB_NAME: wordpress volumes: db_data: {}
-
docker-compose up -d
Docker Swarm
集群方式的部署
简化版的k8s