1、查看进程
ps -ef|grep nginx
2、进入nginx安装目录sbin下，执行命令：
./nginx -t
如下显示：
syntax is ok
test is successful
3、继续执行命令：
nginx -c /usr/local/webserver/nginx/conf/nginx.conf
nginx -s reload
nginx: [error] invalid PID number "" in ...
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