Docker 到底解决了什么？一位工程师的实践反思

# 1. 更新并安装依赖
sudo apt update
sudo apt install -y ca-certificates curl gnupg

# 2. 添加 Docker 官方源
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# 3. 安装 Docker
sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin

# 4. 启动并验证
sudo systemctl start docker
sudo systemctl enable docker
docker --version

version: '3.8'

services:
  db:
    image: mysql:5.7
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: root123
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wpuser
      MYSQL_PASSWORD: wppass123
    volumes:
      - db_data:/var/lib/mysql

  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    restart: always
    ports:
      - "80:80"
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wpuser
      WORDPRESS_DB_PASSWORD: wppass123
    volumes:
      - wp_data:/var/www/html

volumes:
  db_data:
  wp_data:

docker compose up -d

# 老服务器：打包
tar -czvf blog.tar.gz ~/myblog/
scp blog.tar.gz 新服务器IP:/root/

# 新服务器：解压并启动
tar -xzvf blog.tar.gz
cd ~/myblog
docker compose up -d