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add 教程/5.linux的启动选项.

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Signed-off-by: liushuncheng <2930054131@qq.com>
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dracut并不和其他的Linux live启动选项或者是暴力扫描一样，dracut的initramfs可以随时随地的启动硬盘或者liveos
简短的说一下这个
首先是rd.live.image这个选项，这个选项让dracut知道你是个live
之后呢就是root选项，大家肯定不陌生，平常就是/dev/sda1,UUID=~之类的
dracut在livecd上呢采用的是cdlabel，就是root=live:CDLABEL=你的cd卷标，注意区分大小写
默认dracut在cd存放squashfs的目录呢是/LiveOS/，你压缩的squashfs名字是squashfs.img
如果你的init位置在lfs上不是/sbin/init的话，可以手动指定root选项例如root=/bin/bash
如果你编译了Plymouth的话,使用rhgb或者splash选项使用开机动画
关于livecd文件目录结构呢，大家可以下载个fedora的livecd看看
示例:root=live:CDLABEL=LFS rd.live.image splash init=/sbin/init vga=788 nomodeset