echo "🎯 切换到清华镜像源..."

# 备份原配置
sudo cp /etc/apt/sources.list.d/docker.list /etc/apt/sources.list.d/docker.list.bak

# 使用清华镜像源
sudo tee /etc/apt/sources.list.d/docker.list > /dev/null <<EOF
deb [arch=amd64] https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/debian bookworm stable
EOF

# 更新并安装
sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io

echo "✅ 已切换到清华镜像源，速度应该会大幅提升！"