186 lines
3.6 KiB
HTML
186 lines
3.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|
<HTML
|
|
><HEAD
|
|
><TITLE
|
|
>Emergency boot floppies</TITLE
|
|
><META
|
|
NAME="GENERATOR"
|
|
CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
|
|
REL="HOME"
|
|
TITLE="Linux System Administrators Guide"
|
|
HREF="index.html"><LINK
|
|
REL="UP"
|
|
TITLE="Boots And Shutdowns"
|
|
HREF="boots-and-shutdowns.html"><LINK
|
|
REL="PREVIOUS"
|
|
TITLE="Single user mode"
|
|
HREF="single-user.html"><LINK
|
|
REL="NEXT"
|
|
TITLE="init"
|
|
HREF="init-intro.html"></HEAD
|
|
><BODY
|
|
CLASS="SECT1"
|
|
BGCOLOR="#FFFFFF"
|
|
TEXT="#000000"
|
|
LINK="#0000FF"
|
|
VLINK="#840084"
|
|
ALINK="#0000FF"
|
|
><DIV
|
|
CLASS="NAVHEADER"
|
|
><TABLE
|
|
SUMMARY="Header navigation table"
|
|
WIDTH="100%"
|
|
BORDER="0"
|
|
CELLPADDING="0"
|
|
CELLSPACING="0"
|
|
><TR
|
|
><TH
|
|
COLSPAN="3"
|
|
ALIGN="center"
|
|
>Linux System Administrators Guide: </TH
|
|
></TR
|
|
><TR
|
|
><TD
|
|
WIDTH="10%"
|
|
ALIGN="left"
|
|
VALIGN="bottom"
|
|
><A
|
|
HREF="single-user.html"
|
|
ACCESSKEY="P"
|
|
>Prev</A
|
|
></TD
|
|
><TD
|
|
WIDTH="80%"
|
|
ALIGN="center"
|
|
VALIGN="bottom"
|
|
>Chapter 8. Boots And Shutdowns</TD
|
|
><TD
|
|
WIDTH="10%"
|
|
ALIGN="right"
|
|
VALIGN="bottom"
|
|
><A
|
|
HREF="init-intro.html"
|
|
ACCESSKEY="N"
|
|
>Next</A
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
><HR
|
|
ALIGN="LEFT"
|
|
WIDTH="100%"></DIV
|
|
><DIV
|
|
CLASS="SECT1"
|
|
><H1
|
|
CLASS="SECT1"
|
|
><A
|
|
NAME="EMERG-BOOT-FLOPPY"
|
|
></A
|
|
>8.6. Emergency boot floppies</H1
|
|
><P
|
|
>It is not always possible to boot a computer from the hard
|
|
disk.
|
|
For example, if you make a mistake in configuring LILO, you might
|
|
make your system unbootable. For these situations, you need an
|
|
alternative way of booting that will always work (as long as the
|
|
hardware works). For typical PCs, this means booting from the
|
|
floppy drive.</P
|
|
><P
|
|
>Most Linux distributions allow one to create an
|
|
<I
|
|
CLASS="GLOSSTERM"
|
|
>emergency boot floppy</I
|
|
> during installation.
|
|
It is a good idea to do this. However, some such boot disks
|
|
contain only the kernel, and assume you will be using the programs
|
|
on the distribution's installation disks to fix whatever problem
|
|
you have. Sometimes those programs aren't enough; for example,
|
|
you might have to restore some files from backups made with
|
|
software not on the installation disks.</P
|
|
><P
|
|
>Thus, it might be necessary to create a custom root floppy
|
|
as well. The Bootdisk HOWTO by Graham Chapman contains instructions
|
|
for doing this. You can find this HOWTO at
|
|
<A
|
|
HREF="http://www.tldp.org/HOWTO/Bootdisk-HOWTO/index.html"
|
|
TARGET="_top"
|
|
> http://www.tldp.org/HOWTO/Bootdisk-HOWTO/index.html</A
|
|
>.
|
|
You must, of course, remember to keep your emergency boot and
|
|
root floppies up to date.</P
|
|
><P
|
|
>You can't use the floppy drive you use to mount the root
|
|
floppy for anything else. This can be inconvenient if you only
|
|
have one floppy drive. However, if you have enough memory, you
|
|
can configure your boot floppy to load the root disk to a ramdisk
|
|
(the boot floppy's kernel needs to be specially configured for
|
|
this). Once the root floppy has been loaded into the ramdisk,
|
|
the floppy drive is free to mount other disks. </P
|
|
></DIV
|
|
><DIV
|
|
CLASS="NAVFOOTER"
|
|
><HR
|
|
ALIGN="LEFT"
|
|
WIDTH="100%"><TABLE
|
|
SUMMARY="Footer navigation table"
|
|
WIDTH="100%"
|
|
BORDER="0"
|
|
CELLPADDING="0"
|
|
CELLSPACING="0"
|
|
><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="single-user.html"
|
|
ACCESSKEY="P"
|
|
>Prev</A
|
|
></TD
|
|
><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="index.html"
|
|
ACCESSKEY="H"
|
|
>Home</A
|
|
></TD
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="right"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="init-intro.html"
|
|
ACCESSKEY="N"
|
|
>Next</A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
>Single user mode</TD
|
|
><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="boots-and-shutdowns.html"
|
|
ACCESSKEY="U"
|
|
>Up</A
|
|
></TD
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="right"
|
|
VALIGN="top"
|
|
><B
|
|
CLASS="COMMAND"
|
|
>init</B
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></DIV
|
|
></BODY
|
|
></HTML
|
|
> |