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grub2故障举例及修复-张晨
source link: http://blog.51cto.com/13434336/2137497
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一、CentOS7/RHEL7启动先从加点自检开始，然后会将控制权交给BIOS，BIOS工作完成后会将控制权交给GRUB。GRUB在整个启动流程中起到很大的作用，而GRUB中最重要的就是/boot/grub2/grub.cfg配置文件。启动过程中通过临时修改GRUB可以做很多事，包括修改root密码这种危险操作，所以需要对grub.cfg做一些必要操作。1、设置grub密码通过grub2-mkpa
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