centos 7.4 nginx 下 安装 PHP 和 php-fpm 错误小记

问题：在新建 /usr/local/php/var/run/php-fpm.pid 文件前，执行 /usr/local/php/sbin/php-fpm 启动 php-fpm，之后 service php-fpm start/stop 出现以下状况：

service php-fpm stop   出现：
Gracefully shutting down php-fpm kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]
................................... failed. Use force-quit
  
service php-fpm start   出现：
Starting php-fpm [24-Jul-2018 22:11:43] ERROR: unable to bind listening socket for address '127.0.0.1:9000': Address already in use (98)
[24-Jul-2018 22:11:43] ERROR: FPM initialization failed
 failed

解决办法： killall php-fpm ，然后 service php-fpm start

Starting php-fpm  done

service php-fpm stop

Gracefully shutting down php-fpm . done