今天修改过nginx.conf文件后
nginx -s reload重启nginx服务错误
# nginx -s reload
nginx: [error] open() "/var/run/nginx.pid" failed (2: No such file or directory)
查看配置文件，文件正确
# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
原因：nginx reload 只是重新加载配置文件，nginx关闭后找不到
解决方法如下：
# nginx -c /etc/nginx/nginx.conf
# nginx -s reload
或者
# nginx -s reload -c /etc/nginx/nginx.conf
