问题描述

执行nginx -s reload时，出现如下错误

[root@iZuf65h6i43ltlzhqolumyZ conf]# ../sbin/nginx -s reload
nginx: [error] invalid PID number "" in "/usr/local/nginx/logs/nginx.pid"

解决办法

因为每一个nginx进程都对应一个id，存放于nginx.pid中，而在进行重新编译时可能会因为一些bug导致nginx.pid中的id号被卡死，因此无法重启。想要解决这个问题可以杀掉所有nginx进程，再用-c命令指定配置文件进行启动。
【1】执行命令killall -9 nginx杀掉nginx进程；

[root@iZuf65h6i43ltlzhqolumyZ conf]# killall -9 nginx

【2】指定配置文件-c启动nginx

[root@iZuf65h6i43ltlzhqolumyZ sbin]# ./nginx -c /usr/local/nginx/conf/nginx.conf
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
nginx: [emerg] still could not bind()

如果如下出现failed表示nginx卡死了，我们需要通过如下命令查看nginx占用的端口。

[root@iZuf65h6i43ltlzhqolumyZ sbin]# sudo netstat -tulpn

直接给他关闭掉

kill -s 9 对应的pid

【3】进入/usr/local/nginx/sbin执行命令./nginx -s reload重新启动nginx；

[root@iZuf65h6i43ltlzhqolumyZ sbin]# ./sbin/nginx -s reload