Docker进阶DockerCompose

1.Docker Compose介绍

2.Docker Compose安装

2.1下载使用国内地址进行瞎子啊

2.2授权

2.3测试

3.开始使用Docker Compose

3.1创建测试目录

3.2创建app.py文件

3.3创建requirements.txt

3.4创建Dockerfile

3.5在Compose文件中定义服务

3.6使用Compose构建并运行程序

3.7验证

3.8编辑Compose文件以添加绑定挂载

3.9重新构建

3.10更新应用程序

3.11其它命令

4.compose配置编写规则

4.1配置规则

4.2官网地址

5.一键部署WordPress(官方实例)

5.1定义项目

5.2创建docker-compose.yml

5.3构建项目

1.Docker Compose介绍

定义、运行多个容器(YAML文件)

作用：批量容器编排

Docker Compose是Docke官方的开源项目。需要单独安装

(1)服务services：容器、应用(例如：单个web、redis、redis)

(2)项目project：一组关联的容器。(例如：博客：web,mysql)

2.Docker Compose安装

2.1下载使用国内地址进行瞎子啊

(1)官网地址(不推荐 国外地址 太慢了)

sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

(2)国内地址

curl -L https://get.daocloud.io/docker/compose/releases/download/1.12.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose

2.2授权

chmod +x /usr/local/bin/docker-compose

2.3测试

docker-compose --version

3.开始使用Docker Compose

官方实例：https://docs.docker.com/compose/gettingstarted/)

3.1创建测试目录

pwd

mkdir composetest

cd composetest/

pwd

3.2创建app.py文件

vim app.py

1 import time
2
3 import redis
4 from flask import Flask
5
6 app = Flask(__name__)
7 cache = redis.Redis(host='redis', port=6379)
8
9 def get_hit_count():
10 retries = 5
11 while True:
12 try:
13 return cache.incr('hits')
14 except redis.exceptions.ConnectionError as exc:
15 if retries == 0:
16 raise exc
17 retries -= 1
18 time.sleep(0.5)
19
20 @app.route('/')
21 def hello():
22 count = get_hit_count()
23 return 'Hello World! I have been seen {} times.\n'.format(count)

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3.3创建requirements.txt

vim requirements.txt

3.4创建Dockerfile

vim Dockerfile

1 # syntax=docker/dockerfile:1
2 FROM python:3.7-alpine
3 WORKDIR /code
4 ENV FLASK_APP=app.py
5 ENV FLASK_RUN_HOST=0.0.0.0
6 RUN apk add --no-cache gcc musl-dev linux-headers
7 COPY requirements.txt requirements.txt
8 RUN pip install -r requirements.txt
9 EXPOSE 5000
10 COPY . .
11 CMD ["flask", "run"]

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3.5在Compose文件中定义服务

vim docker-compose.yml

1 version: "3.9"
2 services:
3 web:
4 build: .
5 ports:
6 - "5000:5000"
7 redis:
8 image: "redis:alpine"

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3.6使用Compose构建并运行程序

docker-compose up

3.7验证

查看localhost:5000

刷新页面

docker image ls

3.8编辑Compose文件以添加绑定挂载

vim docker-compose.yml

1 version: "3.2"
2 services:
3 web:
4 build: .
5 ports:
6 - "5000:5000"
7 volumes:
8 - .:/code
9 environment:
10 FLASK_ENV: development
11 redis:
12 image: "redis:alpine"

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3.9重新构建

docker-compose up

3.10更新应用程序

vim app.py

1 import time
2
3 import redis
4 from flask import Flask
5
6 app = Flask(__name__)
7 cache = redis.Redis(host='redis', port=6379)
8
9 def get_hit_count():
10 retries = 5
11 while True:
12 try:
13 return cache.incr('hits')
14 except redis.exceptions.ConnectionError as exc:
15 if retries == 0:
16 raise exc
17 retries -= 1
18 time.sleep(0.5)
19
20 @app.route('/')
21 def hello():
22 count = get_hit_count()
23 #return 'Hello World! I have been seen {} times.\n'.format(count)
24 return 'Hello from Docker! I have been seen {} times.\n'.format(count)

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3.11其它命令

docker-compose up -d        用于“分离”模式

docker-compose ps          查看当前正在运行的内容

docker-compose run          允许服务运行一次性命令

docker-compose run web env    查看web服务可用的环境变量 

docker-compose stop         停止服务

docker-compose down --volumes  关闭所有内容，完全删除容器

4.compose配置编写规则

4.1配置规则

version: '' #版本
services: #服务
服务1:web
#服务配置
images
build
network
...
服务2:redis
...
服务3:mysql
...
#其它配置 网络/卷、全局规则
volumes:
networks:
configs:

4.2官网地址

https://docs.docker.com/compose/compose-file/compose-file-v3/

5.一键部署WordPress(官方实例)

官方地址：https://docs.docker.com/samples/wordpress/

5.1定义项目

pwd
mkdir my_wordpress
cd my_wordpress/

5.2创建docker-compose.yml

vim docker-compose.yml

1 version: "3.9"
2
3 services:
4 db:
5 image: mysql:5.7
6 volumes:
7 - db_data:/var/lib/mysql
8 restart: always
9 environment:
10 MYSQL_ROOT_PASSWORD: somewordpress
11 MYSQL_DATABASE: wordpress
12 MYSQL_USER: wordpress
13 MYSQL_PASSWORD: wordpress
14
15 wordpress:
16 depends_on:
17 - db
18 image: wordpress:latest
19 volumes:
20 - wordpress_data:/var/www/html
21 ports:
22 - "8000:80"
23 restart: always
24 environment:
25 WORDPRESS_DB_HOST: db:3306
26 WORDPRESS_DB_USER: wordpress
27 WORDPRESS_DB_PASSWORD: wordpress
28 WORDPRESS_DB_NAME: wordpress
29 volumes:
30 db_data: {}
31 wordpress_data: {}

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5.3构建项目

docker-compose up -d

访问localhost:8000