nginx: [error] open() “/run/nginx.pid” failed (2: No such file or directory)

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：

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。

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。