docker 安装脚本（国内）

#!/bin/bash
set -e

echo "=== Docker 安装脚本启动 ==="

# 检查是否已安装 Docker
if command -v docker >/dev/null 2>&1; then
    echo "⚠️ 发现系统已安装 Docker：$(docker --version)"
    read -p "是否继续覆盖安装？(y/N): " confirm
    if [[ "$confirm" != "y" && "$confirm" != "Y" ]]; then
        echo "✅ 安装中止，未修改系统。"
        exit 0
    fi
fi

echo "=== [1/6] 更新系统包索引（包含重试逻辑） ==="
for i in {1..3}; do
    apt-get update -y && break || {
        echo "⚠️ apt-get update 失败，重试中 ($i/3)..."
        sleep 2
    }
done

echo "=== [2/6] 安装依赖软件包 ==="
apt-get install -y \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg \
    lsb-release \
    software-properties-common

echo "=== [3/6] 添加 Docker 官方 GPG 密钥（清华镜像） ==="
mkdir -p /usr/share/keyrings
curl -fsSL https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/debian/gpg | gpg --dearmor -o /usr/share/keyrings/docker-ce.gpg

echo "=== [4/6] 配置 Docker 软件源为清华镜像 ==="
echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-ce.gpg] https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/debian \
$(lsb_release -sc) stable" | tee /etc/apt/sources.list.d/docker.list

echo "=== [5/6] 再次更新包索引 ==="
apt-get update -y

echo "=== [6/6] 安装 Docker 组件 ==="
apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# zero_free镜像服务
# https://github.com/cmliu/CF-Workers-docker.io
echo "=== 🛠 配置 Docker 镜像加速器（jsDelivr Cloudflare Workers） ==="
mkdir -p /etc/docker
cat > /etc/docker/daemon.json <<EOF
{
  "registry-mirrors": [
     "https://docker.jsdelivr.fyi",
     "https://dockercf.jsdelivr.fyi",
     "https://dockertest.jsdelivr.fyi"
  ]
}
EOF

echo "=== 🔄 重启 Docker 并设置开机自启 ==="
systemctl daemon-reload
systemctl restart docker
systemctl enable docker

echo "✅ Docker 安装并配置完成！使用 'docker version' 检查版本。"