Nginx支持热部署，非常方便地不关闭nginx服务的前提下，添加新的模块功能。
首先查看当前编译参数，复制别漏了原来的模块1
nginx -V
略过编译部分…
make完之后，不要make install
先备份原来的nginx二进制文件1
cp /usr/local/nginx/sbin/nginx /usr/local/nginx/sbin/nginx.old
编译后，源码包里面有一个objs文件夹，复制新的nginx到nginx目录，覆盖1
cp objs/nginx /usr/local/nginx/sbin/nginx
查看当前nginx master进程号1
$ ps -aux | grep nginx
发送USR2型号给nginx master进程1
$ kill -USR2 PID
发送WINCH型号让旧的nginx master优雅关闭worker子进程1
$ kill -WINCH PID
Nginx的信号
| 信号 | 描述 |
|---|---|
| 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 |
关于Linux进程信号，参考：https://www.cnblogs.com/f-ck-need-u/p/7058920.html#auto_id_10