Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast

Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
的解决方法：

在命令行输入：yum clean all

http://blog.andrewpike.co.uk/repodata-is-over-2-weeks-old/