nginx: [error] invalid PID number “” in “/var/run/nginx/nginx.pid”
[root@el6_51 sbin]# ./nginx -s reload
nginx: [error] invalid PID number "" in "/var/run/nginx/nginx.pid"
重新指向配置文件即可
[root@el6_51 sbin]# ./nginx -c /etc/nginx/nginx.conf
[root@el6_51 sbin]# ./nginx -s reload