常见 nginx 信号指令，官网文档
常见指令
| TERM, INT | Quick shutdown |
|---|---|
| QUIT | Graceful shutdown |
| KILL | Halts a stubborn process |
| HUP | Configuration reload Start the new worker processes with a new configuration Gracefully shutdown the old worker processes |
| USR1 | Reopen the log files |
| USR2 | Upgrade Executable on the fly |
| WINCH | Gracefully shutdown the worker processes |
Here’s how to send the QUIT (Graceful Shutdown) signal to the NGINX master process:
$ kill -QUIT $( cat /usr/local/nginx/logs/nginx.pid )
