Docker Compose

Compose介绍

Docker Compose运行步骤

Using Compose is basically a three-step process:

1. Define your app’s environment with a Dockerfile so it can be reproduced anywhere.
2. Define the services that make up your app in docker-compose.yml so they can be run together in an isolated environment.
3. Run docker compose up and the Docker compose command starts and runs your entire app. You can alternatively run docker-compose up using the docker-compose binary.

Compose是Docker官方的开源项目，所以需要安装。Compose要运行的不是一个Services，而是包含多个Services的一个Project。

version: "3.9" # optional since v1.27.0
services:
    web:
        build: .
        ports:
            - "5000:5000"
        volumes:
            - .:/code
            - logvolume01:/var/log
        links:
            - redis
    redis:
        image: redis
volumes:
    logvolume01: {}

安装Compose

# 官方获取Compose安装地址
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
# 推荐下载方式
curl -L https://get.daocloud.io/docker/releases/download/1.25.5/docker-compose-$(uname -s)-$(uname -m) > /usr/local/bin/docker-compose

# 配置可执行权限
sudo chmod +x /usr/local/bin/docker-compose
docker-compose version

# 配置软链接
sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose

运行Compose Quickstart

部署过程

1. 应用app.py

2. Dockerfile将应用打包为镜像

3. Docker-compose yaml文件

   定义整个服务，需要环境、web、redis，完整的上线服务

4. 启动Compose项目（docker-compose up）

Compose任务流程

1. 创建网络
2. 执行Docker-compose yaml
3. 启动服务

Compose默认规则

docker ps中看到两个容器web_1、redis_1的命名来源

默认文件名：文件名_服务器_副本id

docker images中看到所有容器的自动下载规则

docker service ls的报错问题

关于Compose创建的Docker网络规则

docker network ls中可以看到一个新增网络composetest_default，通过docker network inspect

docker swarm

docker stack

docker secret

docker config