nginx -s stop后再次启动nginx -s reload ,总是会报错误nginx: [error] open() "/alidata/server/nginx/logs/nginx.pid" failed (2: No such file or directory)，这应该是因为把nginx进程杀死后pid丢失了，下一次再开启nginx -s reload时无法启动，重装可以解决这个问题，但是太麻烦了。
一开始百度解决该问题。只是找到几个求助答案。没有实际有效的方法，于是用google开始搜索，虽然英语比较恶心，但一般，英文网站上总会有解决方法这一次也不另外。
issued a nginx -s stop and after that I got this error when trying to reload it.
[error]: invalid PID number "" in "/var/run/nginx.pid"
That /var/run/nginx/pid file is empty atm.
What do I need to do to fix it?
nginx -s reload is only used to tell a running nginx process to reload its config. After a stop, you don't have a running nginx process to send a signal to. Just run nginx (possibly with a -c /path/to/config/file)
于是我用了这方法，也就是nginx -c /path/to/config/file) //在我机器上是这样的/alidata/server/nginx/sbin/nginx -c /alidata/server/nginx/conf/nginx.conf