Nginx的启动、关闭和重启

Nginx的启动关闭和重启

nginx可以通过信号指令控制进程，常用的信号有：

QUIT：处理完当前请求后关闭进程

HUP：重新加载配置，也就是关闭原有的进程，开启新的进程，此操作不会中断用户的访问请求，所以又称为平滑重启nginx

USR1：用于nginx的日志切换，也就是重新打开一个日志文件，每天要生成一个新的日志文件时，可以使用该信号控制。

USR2：平滑升级可执行程序

WINCH ：从容关闭工作进程

常用的方法控制有：

①  kill –XXX主进程号

 

[root@localhost run]# ps -ef |grep nginx

root     2771     1  0 10:34 ?        00:00:00 nginx: master process/opt/nginx/sbin/nginx

503      2772  2771  0 10:34 ?        00:00:00 nginx: worker process

503      2773  2771  0 10:34 ?        00:00:00 nginx: worker process

503       2774 2771  0 10:34 ?        00:00:00 nginx: worker process

503      2775  2771  0 10:34 ?        00:00:00 nginx: worker process

root     3575  2730  0 12:08 pts/1    00:00:00 grep nginx

[root@localhost run]# kill -QUIT2771

[root@localhost run]# ps -ef |grep nginx

root     3578  2730  0 12:09 pts/1    00:00:00 grep nginx

[root@localhost run]#/opt/nginx/sbin/nginx

[root@localhost run]# ps -ef |grep nginx

root     3580     1  0 12:09 ?        00:00:00 nginx: master process/opt/nginx/sbin/nginx

503      3581  3580  0 12:09 ?        00:00:00 nginx: worker process

503      3582  3580  0 12:09 ?        00:00:00 nginx: worker process

503      3583  3580  0 12:09 ?        00:00:00 nginx: worker process

503      3584  3580  0 12:09 ?        00:00:00 nginx: worker process

root     3588  2730  0 12:10 pts/1    00:00:00 grep nginx

[root@localhost run]# kill -HUP3580

[root@localhost run]# ps -ef |grep nginx

root     3580     1  0 12:09 ?        00:00:00 nginx: master process/opt/nginx/sbin/nginx

503      3590  3580  0 12:10 ?        00:00:00 nginx: worker process

503      3591  3580  0 12:10 ?        00:00:00 nginx: worker process

503      3592  3580  0 12:10 ?        00:00:00 nginx: worker process

503      3593  3580  0 12:10 ?        00:00:00 nginx: worker process

root     3596  2730  0 12:10 pts/1    00:00:00 grep nginx

[root@localhost run]# kill -WINCH3580

[root@localhost run]# ps -ef |grep nginx

root     3580     1  0 12:09 ?        00:00:00 nginx: master process/opt/nginx/sbin/nginx

 

② kill -信号类型`cat /安装目录/logs/nginx.pid`

使用该方法时需要在nginx.conf配置了pid文件存放路径则该文件存放的就是Nginx主进程号，如果没指定则放在nginx的logs目录下。有了pid文件，我们就不用先查询Nginx的主进程号，而直接向Nginx发送信号了，命令如下：

kill -信号类型`cat /安装目录/logs/nginx.pid` ，本人将nginx安装于/opt/nginx目录下 

[root@localhost conf]# cd /opt/nginx/logs/

[root@localhost logs]# ls

access.log error.log  nginx.pid

[root@localhost logs]# ps -ef |grep nginx

root     3580     1  0 12:09 ?        00:00:00 nginx: master process/opt/nginx/sbin/nginx

503      3680  3580  0 12:28 ?        00:00:00 nginx: worker process

503      3681  3580  0 12:28 ?        00:00:00 nginx: worker process

503      3682  3580  0 12:28 ?        00:00:00 nginx: worker process

503      3683  3580  0 12:28 ?        00:00:00 nginx: worker process

root     3687  2730  0 12:28 pts/1    00:00:00 grep nginx

[root@localhost logs]# kill -HUP`cat /opt/nginx/logs/nginx.pid`

[root@localhost logs]# ps -ef |grep nginx

root     3580     1  0 12:09 ?        00:00:00 nginx: master process/opt/nginx/sbin/nginx

503      3689  3580  0 12:28 ?        00:00:00 nginx: worker process

503      3690  3580  0 12:28 ?        00:00:00 nginx: worker process

503      3691  3580  0 12:28 ?        00:00:00 nginx: worker process

503      3692  3580  0 12:28 ?        00:00:00 nginx: worker process

root     3694  2730  0 12:28 pts/1    00:00:00 grep nginx

[root@localhost logs]#