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CentOS 7.5 下启动 Nginx 出现如下错误：
nginx: [error] open() “/run/nginx.pid” failed (2: No such file or directory)
解决方法：找到你的 nginx.conf 的文件夹目录，然后运行类似如下命令
nginx -c etc/nginx/nginx.conf
再运行 nginx -s reload，就可以了。
如下图：
![nginx: [error] open()“/run/nginx.pid”failed (2: No such file or directory)](https://s.xgss.net/sky/2022-01-21/095be21accb5a2aea66fb96594998515.png "nginx: [error] open()“/run/nginx.pid”failed (2: No such file or directory)")
案例 2：
如果启动 Nginx 出现如下错误：
[linuxidc@localhost www.linuxidc.com]$ nginx -s reload
nginx: [alert] could not open error log file: open() “/var/log/nginx/error.log” failed (13: Permission denied)
2018/11/03 10:26:00 [warn] 21354#0: the “user” directive makes sense only if the master process runs with super-user privileges, ignored in /etc/nginx/nginx.conf:5
2018/11/03 10:26:00 [notice] 21354#0: signal process started
2018/11/03 10:26:00 [alert] 21354#0: kill(21052, 1) failed (1: Operation not permitted)
原因：当前用户对该位置没有写入权限，输入 su 和密码进入 root 模式后，重新启动服务器就好了，原因是因为没有权限。
![nginx: [error] open()“/run/nginx.pid”failed (2: No such file or directory)](https://s.xgss.net/sky/2022-01-21/8b0480a2250e33be8e376928c5d6574a.png "nginx: [error] open()“/run/nginx.pid”failed (2: No such file or directory)")
注：以非 root 权限启动时，会出现 nginx: [alert] could not open error log file: open() “/var/log/nginx/error.log” failed (13: Permission denied) 错误。那就以 root 权限启动就好。
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