使用nginx架设wordpress站点，nginx安装后测试页面显示正常，当将wordpres安装包部署好之后运行安装程序报错，查看nginx的error日志显示 failed（13：Permission denied）。排查过程如下：
查看 nginx 运行状态,确认运行于 www-data 用户下。
roy@localhost:/$ sudo vim /etc/nginx/nginx.conf
...
user www-data;
worker_processes auto;
...
roy@localhost:/$ sudo ps aux | grep nginx
root 69558 0.0 0.0 66276 1708 ? Ss 10:14 0:00
nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
www-data 69559 0.0 0.1 66516 5540 ? S 10:14 0:00 nginx: worker process
www-data 69560 0.0 0.1 66516 6944 ? S 10:14 0:00 nginx: worker process
root 69794 0.0 0.0 8168 672 pts/1 S+ 10:19 0:00 grep --color=auto nginx
通常情况下 www-data 用户没有权限访问用户私人目录，而我将 wordpress 放到了 /home/roy/www 的私人目录内，因此导致了权限不足的情况。
From https://stackoverflow.com/questions/25774999/nginx-stat-failed-13-permission-denied
Usually www-data does not have permissions to cd to other users home directories.
roy@localhost:/$ sudo -u www-data stat /home/roy/www
stat: cannot statx '/home/roy/www': Permission denied
The best solution in that case would be to add www-data to username group:
roy@localhost:/$ sudo gpasswd -a www-data roy
Adding user www-data to group roy
roy@localhost:/$ sudo -u www-data stat /home/roy/www
File: /home/roy/www
Size: 4096 Blocks: 8 IO Block: 4096 directory
Device: fc03h/64515d Inode: 397083 Links: 6
Access: (0755/drwxr-xr-x) Uid: ( 33/www-data) Gid: ( 33/www-data)
Access: 2024-03-19 15:24:55.906448849 +0800
Modify: 2024-03-19 15:24:55.002369008 +0800
Change: 2024-03-19 15:24:55.002369008 +0800
Birth: 2024-03-19 13:45:56.359413669 +0800
For your changes to work, restart nginx
roy@localhost:/$ sudo service nginx restart
