Nginx signal management process

 

CHLD signal: work process will exit abnormally Master CHLD process sends a signal, then the Master Worker process knows the process to exit, and then re-starting a Worker process;

TERM Signal: quit the process, not elegant;

QUIT signal: elegant exit process; without affecting the premise has been in communication connection;

HUP signal: tell the Master Worker process re-pull process;

USR1 signal: Re-open the log file;

USR2 signal: Notification process Master, let Worker process not to accept the request;

WINCH signal: notification process to close the Master Worker process;

USR2 WINCH signal and is used primarily with smooth upgrading Nginx;