cacti出图不出数据的问题

生产环境：

操作系统：CentOS 6.6

软件包：Version 0.8.8a 

插件如下：

Actions	Name	Version	Load Order	Description**	Type	Status	Author
	Reportit	0.7.3		Cacti-ReportIt	General	Active	The Cacti Group
	Monitor	1.3		Device Monitoring	General	Active	Jimmy Conner
	Settings	0.71		Global Plugin Settings	System	Active	Jimmy Conner
	Weathermap	0.97a		PHP Network Weathermap	Old PIA	Active	Howard Jones
	Realtime	0.5		Realtime Graph Viewer	General	Active	Mathieu Virbel
	Syslog	1.22		Syslog Monitoring	General	Active	Jimmy Conner
	Thold	0.5		Thresholds	General	Active	Jimmy Conner

问题如图：

[[email protected]]# crontab  -l

bash: crontab:command not found  #事前安装好了，在这里说明没找到该命令

[[email protected]]# chkconfig --list|grep cron #显示空白，说明没有安装

[[email protected]]# yum install  -y  vixie-cron

[[email protected]]# echo ‘*/1 * * * *  /usr/bin/php/var/www/html/cacti/poller.php  >/dev/null 2>&1‘ >>/var/spool/cron/root  #每分种执行一次poller.php

问题解决，原因是cron出了问题。