Cacti Realtime不显示实时图形
点击下图中的"Realtime":https://s5.运维网.com/wyfs02/M02/A4/82/wKioL1ms7PqSsmrRAABn8d3XMKQ443.png-wh_500x0-wm_3-wmp_4-s_3219142785.png
并未显示实时图形，而是提示，Cache Directory不存在：
https://s5.运维网.com/wyfs02/M00/05/D1/wKiom1ms7RaCJiz_AAAO8FgXgY8599.png-wh_500x0-wm_3-wmp_4-s_652901280.png
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解决方法：
http://www.itechlounge.net/2013/11/linux-cacti-the-image-cache-directory-does-not-exist/
修改Cache Directory:
Console> Settings > Misc > Cache Directory
/var/www/html/cache/
chmod 777 /var/www/html/cache/
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