阿里云服务器Alibaba Cloud Linux 3如何安装nginx，避坑指南

最近买了一个4核16G内存阿里云服务器，安装nginx，报错如下：

Waiting for process with pid 49651 to finish. nginx repo                                                             2.3 kB/s | 1.9 kB     00:00     Errors during downloading metadata for repository 'nginx':   - Status code: 404 for http://nginx.org/packages/centos/3/x86_64/repodata/repomd.xml (IP: 3.125.197.172)

根据错误信息 Status code: 404 for http://nginx.org/packages/centos/3/x86_64/repodata/repomd.xml，这表明 Nginx 官方仓库中找不到针对 CentOS 3 的软件包，而 Alibaba Cloud Linux 3 被错误识别为 CentOS 3。以下是解决方案：

一、修正 Nginx 仓库配置