我在CentOS 7.x中使用AWS EC2（c3.xlarge）实例，这些是我的挂载点：
[centos@ip-10-0-4-119 ~]$ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda1 8.0G 1.5G 6.6G 18% / devtmpfs 3.6G 0 3.6G 0% /dev tmpfs 3.5G 0 3.5G 0% /dev/shm tmpfs 3.5G 17M 3.5G 1% /run tmpfs 3.5G 0 3.5G 0% /sys/fs/cgroup /dev/xvdb 40G 49M 38G 1% /mnt tmpfs 707M 0 707M 0% /run/user/1000 根分区/是8GB（用于操作系统），我有一个40GB的驱动器安装在/mnt的网站文件。 这是一个标准的设置。
我以root身份（使用sudo su - ）login，并将/mnt的所有权更改为centos:centos （您login的默认帐户）。
在这个目录中，创build了另一个目录来存储所有错误日志： /mnt/errors （dir perm是755）。
Nginx安装了nginx.conf具有以下几行：
user centos; worker_processes 4; error_log /mnt/errors/nginx-errors.log crit; pid /var/run/nginx.pid;
当我用这个命令启动nginx服务器时： systemctl start nginx.service我得到以下错误：
[centos@ip-10-0-4-119 ~]$ sudo systemctl status nginx â— nginx.service - nginx - high performance web server Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since Fri 2016-11-11 02:20:14 UTC; 7min ago Docs: http://nginx.org/en/docs/ Process: 10394 ExecStartPre=/usr/sbin/nginx -t -c /etc/nginx/nginx.conf (code=exited, status=1/FAILURE) Nov 11 02:20:14 ip-10-0-4-119.localdomain systemd[1]: Starting nginx - high performance web server... Nov 11 02:20:14 ip-10-0-4-119.localdomain nginx[10394]: nginx: the configuration file /etc/nginx/nginx.conf syntax is ok Nov 11 02:20:14 ip-10-0-4-119.localdomain nginx[10394]: nginx: [emerg] open() "/mnt/errors/nginx-errors.log" failed (13: Permission denied) Nov 11 02:20:14 ip-10-0-4-119.localdomain nginx[10394]: nginx: configuration file /etc/nginx/nginx.conf test failed Nov 11 02:20:14 ip-10-0-4-119.localdomain systemd[1]: nginx.service: control process exited, code=exited status=1 Nov 11 02:20:14 ip-10-0-4-119.localdomain systemd[1]: Failed to start nginx - high performance web server. Nov 11 02:20:14 ip-10-0-4-119.localdomain systemd[1]: Unit nginx.service entered failed state. Nov 11 02:20:14 ip-10-0-4-119.localdomain systemd[1]: nginx.service failed.
为什么我无法使用自定义位置来存储nginx错误？