nginx 的debug模式

编译的时候添加：

--with-debug

 nginx.conf中的配置：

error_log  logs/error.log debug;

#master_process  off;
daemon          off;
daemon off;            

说明：
master_process  on; 
Do not use the "daemon" and "master_process" directives in a production mode, these options are mainly used for development only. You can use  daemon off  safely in production mode with runit / daemontools however you can't do a graceful upgrade.  master_process off  should never be used in production.

生产环境中不要使用"daemon"和"master_process"指令，这些选项仅用于开发调试。