安装cacti 0.8.8.a后使用advanced ping插件，cacti后台报错：
SPINE: Poller[0] ERROR: SS[0] PHP Script Server communications lost. Restarting PHP Script Server
在系统中手动执行：
php /var/www/html/scripts/ss_fping.php 192.168.0.1 20 ICMP
提示：
PHP Fatal error: Call to undefined function posix_geteuid() in /var/www/html/scripts/ss_fping.php on line 60
解决办法：
yum install php-process