$ nginx -s <SIGNAL>

• stop : fast shutdown
• quit : graceful shutdown
• reload : reloading the configuration file
• reopen : reopening the log files

master 프로세스 시그널

• TERM, INT: fast shutdown
• QUIT: graceful shutdown
• HUP: changing configuration, keeping up with a changed time zone (only for FreeBSD and Linux), starting new worker processes with a new configuration, graceful shutdown of old worker processes
• USR1: re-opening log files
• USR2: upgrading an executable file
• WINCH: graceful shutdown of worker processes

worker 프로세스 시그널

• TERM, INT: fast shutdown
• QUIT: graceful shutdown
• USR1: re-opening log files
• WINCH: abnormal termination for debugging (requires debug_points to be enabled)