invalid PID number ＂＂ in ＂/usr/local/var/run/nginx/nginx.pid＂，nginxnginx.pid

invalid PID number "" in "/usr/local/var/run/nginx/nginx.pid"，nginxnginx.pid

nginx: [error] invalid PID number "" in "/usr/local/var/run/nginx/nginx.pid"

解决办法：

$ sudo nginx -c /usr/local/etc/nginx/nginx.conf
 
$ sudo nginx -s reload

/usr/servers/nginx/sbin/nginx  -c /usr/servers/nginx/conf/nginx.conf