为了安全php-fpm默认是以apache用户启动的
[root@chaoge ~]# ps -aux | grep php-fpm
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ
root 4539 0.0 0.0 205552 3716 ? Ss 10:22 0:00 php-fpm: master process (/etc/php-fpm.conf)
apache 4540 0.0 0.0 205552 3332 ? S 10:22 0:00 php-fpm: pool www
apache 4541 0.0 0.0 205552 3332 ? S 10:22 0:00 php-fpm: pool www
apache 4542 0.0 0.0 205552 3332 ? S 10:22 0:00 php-fpm: pool www
apache 4543 0.0 0.0 205552 3332 ? S 10:22 0:00 php-fpm: pool www
apache 4544 0.0 0.0 205552 3332 ? S 10:22 0:00 php-fpm: pool www
root 4556 0.0 0.0 103248 888 pts/1 S+ 10:22 0:00 grep php-fpm
部分文章说要以root身份启动需要设置一堆非常复杂的程序，并且甚至有人说不能以root身份启动。既然是php-fpm程序，所以应该先找配置文件，于是打开默认的配置文件，具体你得看你的默认配置文件路径在哪，比如我的配置文件位置在/etc/php-fpm.d/www.conf
www.conf 找到
; RPM: apache Choosed to be able to access some dir as httpd
user = apache
改成
; RPM: apache Choosed to be able to access some dir as httpd
user = root
重新启动php-fpm
[root@chaoge ~]# ps -le | grep php-fpm
1 S 0 4974 1 0 80 0 - 51388 ep_pol ? 00:00:00 php-fpm
5 S 48 4975 4974 0 80 0 - 51388 inet_c ? 00:00:00 php-fpm
5 S 48 4976 4974 0 80 0 - 51388 inet_c ? 00:00:00 php-fpm
5 S 48 4977 4974 0 80 0 - 51388 inet_c ? 00:00:00 php-fpm
5 S 48 4978 4974 0 80 0 - 51388 inet_c ? 00:00:00 php-fpm
5 S 48 5035 4974 0 80 0 - 51388 inet_c ? 00:00:00 php-fpm
[root@chaoge ~]# kill -QUIT 5035
[root@chaoge ~]# php-fpm
[17-Apr-2015 10:33:38] ERROR: [pool www] please specify user and group other than root
[17-Apr-2015 10:33:38] ERROR: FPM initialization failed
[root@chaoge ~]#
报错了，提示运行php-fpm运行用户和组只能选择其它的除了root以外，于是查看php-fpm文档，会发现其中一个选项-R
[root@chaoge ~]# php-fpm --help
Usage: php [-n] [-e] [-h] [-i] [-m] [-v] [-t] [-p <prefix>] [-g <pid>] [-c <file>] [-d foo[=bar]] [-y <file>] [-D] [-F]
-c <path>|<file> Look for php.ini file in this directory
-n No php.ini file will be used
-d foo[=bar] Define INI entry foo with value 'bar'
-e Generate extended information for debugger/profiler
-h This help
-i PHP information
-m Show compiled in modules
-v Version number
-p, --prefix <dir>
Specify alternative prefix path to FastCGI process manager (default: /usr).
-g, --pid <file>
Specify the PID file location.
-y, --fpm-config <file>
Specify alternative path to FastCGI process manager config file.
-t, --test Test FPM configuration and exit
-D, --daemonize force to run in background, and ignore daemonize option from config file
-F, --nodaemonize
force to stay in foreground, and ignore daemonize option from config file
-R, --allow-to-run-as-root
Allow pool to run as root (disabled by default)
于是我们试着启动的时候加上这个参数试一试
[root@chaoge ~]# php-fpm -R
[root@chaoge ~]# ps -aux | grep php-fpm
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ
root 5497 0.0 0.0 205552 3712 ? Ss 10:36 0:00 php-fpm: master process (/etc/php-fpm.conf)
root 5498 0.0 0.0 205552 3196 ? S 10:36 0:00 php-fpm: pool www
root 5499 0.0 0.0 205552 3196 ? S 10:36 0:00 php-fpm: pool www
root 5500 0.0 0.0 205552 3196 ? S 10:36 0:00 php-fpm: pool www
root 5501 0.0 0.0 205552 3200 ? S 10:36 0:00 php-fpm: pool www
root 5502 0.0 0.0 205552 3200 ? S 10:36 0:00 php-fpm: pool www
root 5524 0.0 0.0 103252 888 pts/1 S+ 10:36 0:00 grep php-fpm
成功启动了，测试一下，以root用户写了一个shell脚本保存在root宿主目录下，php里exec写好的脚本正常运行。
最后，奉劝大家生产环境大家最好别这样做，否则你知道的。。。
