nginx（No such file or directory与invalid PID number）

1.启动

/usr/local/nginx/sbin/nginx

2.重启

/usr/local/nginx/sbin/nginx -s reload

3.关闭

/usr/local/nginx/sbin/nginx -s stop

4.检验配置文件

/usr/local/nginx/sbin/nginx -t

5.再启动nginx服务时，无法正常启动，报错误信息如下

[root@localhost nginx]# /usr/local/nginx/sbin/nginx -t nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful[root@localhost nginx]# /usr/local/nginx/sbin/nginx -s reload nginx: [error] invalid PID number "" in "/usr/local/nginx/logs/nginx.pid"

-t 没问题，reload就报错了。因为是加载配置文件报的错，所以用-c 选项指定配置文件 ，如此指明后问题解决搜了一下解决：

[root@localhost logs]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf

6.此时如果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，也可以用

[root@localhost logs]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/logs/nginx.pid

注：看是不是端口被占用

ss -nulpt

7.记录我的一个报错

1.先用网上查的方法测了

[root@localhost logs]# /usr/local/nginx/sbin/nginx -s reload
nginx: [error] open() "/usr/local/nginx/logs/nginx.pid" failed (2: No such file or directory)

[root@localhost logs]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/logs/nginx.pid
nginx: [emerg] open() "/usr/local/nginx/logs/nginx.pid" failed (2: No such file or directory)

2.查看是否启动

[root@localhost logs]# ss -nulpt  | grep :80
tcp    LISTEN     0      128                       *:80                                    *:*                   users:(("nginx",pid=4488,fd=6),("nginx",pid=4487,fd=6))

[root@localhost logs]#  pgrep nginx
4487
4488

3.尝试手动关闭

[root@localhost nginx]# /usr/local/nginx/sbin/nginx -s stop
nginx: [error] open() "/usr/local/nginx/logs/nginx.pid" failed (2: No such file or directory)

[root@localhost logs]#  killall -9 nginx

[root@localhost logs]#  ps -auxf | grep nginx
root      4518  0.0  0.0 112720   984 pts/1    S+   21:28   0:00          \_ grep --color=auto nginx

4.重启就好啦

[root@localhost logs]#  /usr/local/nginx/sbin/nginx

[root@localhost logs]# ss -nulpt | grep nginx
tcp    LISTEN     0      128       *:80                    *:*                   users:(("nginx",pid=4521,fd=6),("nginx",pid=4520,fd=6))

[root@localhost logs]# ls
access.log  error.log  nginx.pid

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，搜到的也是-c的那个

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