查看apache错误日志：

错误信息Mon Dec 26 11:00:48.241653 2016] [:error] [pid 32607] [client 192.168.10.79:65009] PHP Fatal error: Call to undefined function define_syslog_variables() in /usr/local/cacti/plugins/thold/includes/settings.php on line 132

查看错误访问路径文件

找到132行 将它注释