768 lines
13 KiB
HTML
768 lines
13 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Configure the GRUB boot
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loader</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Remote Serial Console HOWTO"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Configure the boot loader"
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HREF="configure-boot-loader.html"><LINK
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REL="PREVIOUS"
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TITLE="Configure the LILO boot
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loader"
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HREF="configure-boot-loader-lilo.html"><LINK
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REL="NEXT"
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TITLE="Configure the SYSLINUX boot
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loader"
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HREF="configure-boot-loader-syslinux.html"></HEAD
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><BODY
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CLASS="SECTION"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Remote Serial Console HOWTO</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="configure-boot-loader-lilo.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 4. Configure the boot loader</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="configure-boot-loader-syslinux.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECTION"
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><H1
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CLASS="SECTION"
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><A
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NAME="CONFIGURE-BOOT-LOADER-GRUB"
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></A
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>4.2. Configure the <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> boot
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loader</H1
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><P
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><SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> is a boot loader designed to
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boot a wide range of operating systems from a wide range of
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filesystems. <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> is becoming popular
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due to the increasing number of possible root filesystems that can
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Linux can reside upon.</P
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><P
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><SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> is documented in a
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<SPAN
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CLASS="ABBREV"
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>GNU</SPAN
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> info file. Type <B
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CLASS="COMMAND"
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>info grub</B
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>
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to view the documentation.</P
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><P
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>The <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> configuration file is
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<TT
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CLASS="FILENAME"
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>/boot/grub/menu.lst</TT
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>. Some distributions use
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another configuration file; for example, <SPAN
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CLASS="PRODUCTNAME"
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>Red Hat
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Linux</SPAN
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> uses the file
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<TT
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CLASS="FILENAME"
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>/boot/grub/grub.conf</TT
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>.</P
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><P
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><SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> configuration files are
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interpreted. Syntax errors will not be detected until the machine
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is rebooted, so take care not to make typing errors.</P
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><P
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>Edit the <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> configuration file
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and remove any <B
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CLASS="COMMAND"
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>splashimage</B
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> entries. If these
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entries are not removed <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> 0.90
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behaves very oddly, transferring control between the serial console
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and the attached monitor and keyboard.</P
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><P
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>If there is not already a <B
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CLASS="COMMAND"
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>password</B
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> command
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in the <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> configuration file then
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create a hashed password, see <A
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HREF="configure-boot-loader-grub.html#CONFIGURE-BOOT-LOADER-GRUB-MD5"
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>Figure 4-4</A
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>. The password should be
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good, as it can be used to gain <SPAN
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CLASS="SYSTEMITEM"
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>root</SPAN
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> access.</P
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><DIV
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CLASS="FIGURE"
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><A
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NAME="CONFIGURE-BOOT-LOADER-GRUB-MD5"
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></A
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><P
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><B
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>Figure 4-4. Using <B
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CLASS="COMMAND"
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>md5crypt</B
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> to create a hashed
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password for <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> </B
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></P
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><TABLE
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BORDER="1"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="SCREEN"
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><TT
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CLASS="PROMPT"
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>grub></TT
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> <B
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CLASS="COMMAND"
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>md5crypt</B
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>
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<TT
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CLASS="PROMPT"
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>Password</TT
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>: <TT
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CLASS="USERINPUT"
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><B
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>**********</B
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></TT
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>
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<TT
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CLASS="COMPUTEROUTPUT"
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>Encrypted: $1$U$JK7xFegdxWH6VuppCUSIb.</TT
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></PRE
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></FONT
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></TD
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></TR
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></TABLE
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></DIV
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><P
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>Use that hashed password in the
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<SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> configuration file, this is shown
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in <A
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HREF="configure-boot-loader-grub.html#CONFIGURE-BOOT-LOADER-GRUB-PASSWORD"
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>Figure 4-5</A
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>.</P
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><DIV
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CLASS="FIGURE"
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><A
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NAME="CONFIGURE-BOOT-LOADER-GRUB-PASSWORD"
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></A
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><P
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><B
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>Figure 4-5. <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> configuration to require a
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password</B
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></P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="PROGRAMLISTING"
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>password --md5 $1$U$JK7xFegdxWH6VuppCUSIb.</PRE
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></FONT
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></TD
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></TR
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></TABLE
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></DIV
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><P
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>Define the serial port and configure
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<SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> to use the serial port, as shown in
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<A
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HREF="configure-boot-loader-grub.html#CONFIGURE-BOOT-LOADER-GRUB-SERIAL"
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>Figure 4-6</A
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>.</P
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><DIV
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CLASS="FIGURE"
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><A
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NAME="CONFIGURE-BOOT-LOADER-GRUB-SERIAL"
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></A
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><P
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><B
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>Figure 4-6. <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> configuration for serial
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console</B
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></P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="PROGRAMLISTING"
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>serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
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terminal serial</PRE
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></FONT
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></TD
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></TR
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></TABLE
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></DIV
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><P
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><TT
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CLASS="LITERAL"
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>--unit</TT
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> is the number of the
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serial port, counting from zero, unit 0 being
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<TT
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CLASS="LITERAL"
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>COM1</TT
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>.</P
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><P
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>Note that the values of
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<TT
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CLASS="LITERAL"
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>--parity</TT
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> are spelt out in full:
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<TT
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CLASS="LITERAL"
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>no</TT
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>, <TT
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CLASS="LITERAL"
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>even</TT
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> and
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<TT
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CLASS="LITERAL"
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>odd</TT
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>. The common abbreviations
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<TT
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CLASS="LITERAL"
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>n</TT
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>, <TT
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CLASS="LITERAL"
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>e</TT
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> and <TT
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CLASS="LITERAL"
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>o</TT
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>
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are <EM
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>not</EM
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> accepted.</P
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><P
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>If there is mysteriously no output on the serial port then
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suspect a syntax error in the <B
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CLASS="COMMAND"
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>serial</B
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> or
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<B
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CLASS="COMMAND"
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>terminal</B
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> commands.</P
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><P
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>If you also want to use and attached monitor and keyboard as
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well as the serial port to control the
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<SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> boot loader then use the
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alternative configuration in <A
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HREF="configure-boot-loader-grub.html#CONFIGURE-BOOT-LOADER-GRUB-SERIALCONSOLE"
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>Figure 4-7</A
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>.</P
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><DIV
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CLASS="FIGURE"
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><A
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NAME="CONFIGURE-BOOT-LOADER-GRUB-SERIALCONSOLE"
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></A
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><P
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><B
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>Figure 4-7. <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> configuration for serial
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console and attached monitor and keybaord console</B
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></P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="PROGRAMLISTING"
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>password --md5 $1$U$JK7xFegdxWH6VuppCUSIb.
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serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
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terminal --timeout=10 serial console</PRE
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></FONT
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></TD
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></TR
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></TABLE
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></DIV
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><P
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>When both the serial port and the attached monitor and
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keyboard are configured they will both ask for a key to be pressed
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until the timeout expires. If a key is pressed then the boot menu
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is displayed to that device. Disconcertingly, the other device
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sees nothing.</P
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><P
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>If no key is pressed then the boot menu is displayed on the
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whichever of <TT
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CLASS="LITERAL"
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>serial</TT
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> or
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<TT
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CLASS="LITERAL"
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>console</TT
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> is listed first in the
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<B
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CLASS="COMMAND"
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>terminal</B
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> command. After the timeout set by the
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<B
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CLASS="COMMAND"
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>timeout</B
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> the default option set by
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<B
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CLASS="COMMAND"
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>default</B
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> is booted.</P
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><DIV
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CLASS="FIGURE"
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><A
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NAME="CONFIGURE-BOOT-LOADER-GRUB-PRESS"
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></A
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><P
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><B
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>Figure 4-8. GRUB output to default device when configured for serial
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and attached monior output</B
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></P
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><TABLE
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BORDER="1"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="SCREEN"
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><TT
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CLASS="COMPUTEROUTPUT"
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>Press any key to continue.
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Press any key to continue.
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Press any key to continue.
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Press any key to continue.
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Press any key to continue.
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Press any key to continue.
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Press any key to continue.
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Press any key to continue.
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Press any key to continue.
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Press any key to continue.
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GRUB version 0.90 (639K lower / 162752K upper memory)
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+-------------------------------------------------------------------------+
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| [ Red Hat Linux (2.4.9-21) ] |
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+-------------------------------------------------------------------------+
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Use the ^ and v keys to select which entry is highlighted.
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Press enter to boot the selected OS or 'p' to enter a
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password to unlock the next set of features.
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The highlighted entry will be booted automatically in 10 seconds.</TT
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></PRE
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></FONT
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></TD
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></TR
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></TABLE
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></DIV
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><P
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>If you are not using a <SPAN
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CLASS="ACRONYM"
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>VT100</SPAN
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> terminal then
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the cursor keys may not work to select a
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<SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> menu item. The instructions shown
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in <A
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HREF="configure-boot-loader-grub.html#CONFIGURE-BOOT-LOADER-GRUB-PRESS"
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>Figure 4-8</A
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> are literally
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correct: <SPAN
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CLASS="GUILABEL"
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>Use the ^ and v keys</SPAN
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> means that the
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caret key
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(<B
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CLASS="KEYCAP"
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>Shift</B
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>-<B
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CLASS="KEYCAP"
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>6</B
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>)
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moves the cursor up and letter vee key (<B
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CLASS="KEYCAP"
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>V</B
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>) moves
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the cursor down.</P
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><P
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>Note when configuring <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> that
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there are two timeouts involved. <TT
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CLASS="COMPUTEROUTPUT"
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>Press any key to
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continue</TT
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> is printed for <B
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CLASS="COMMAND"
|
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>terminal
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--timeout=10</B
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> seconds, waiting for someone on the keyboard
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or terminal to press a key to get the input focus. Then the menu
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is displayed for <B
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CLASS="COMMAND"
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>timeout 10</B
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> seconds before the
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default boot option is taken.</P
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><P
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>If the terminal attached to the serial port is not a real or
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emulated <SPAN
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CLASS="PRODUCTNAME"
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>VT100</SPAN
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>, then force
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<SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> to use it's command line interface.
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This interface is much more difficult to use than
|
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<SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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>'s menu interface; however, the
|
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command line interface does not assume the
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<SPAN
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CLASS="PRODUCTNAME"
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>VT100</SPAN
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>'s terminal language.</P
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><DIV
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CLASS="FIGURE"
|
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><A
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NAME="CONFIGURE-BOOT-LOADER-GRUB-DUMB"
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></A
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><P
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><B
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>Figure 4-9. <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> configuration for command
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line interface for terminals other than
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<SPAN
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CLASS="PRODUCTNAME"
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>VT100</SPAN
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></B
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></P
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><TABLE
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BORDER="0"
|
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BGCOLOR="#E0E0E0"
|
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WIDTH="100%"
|
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><TR
|
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><TD
|
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><FONT
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COLOR="#000000"
|
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><PRE
|
|
CLASS="PROGRAMLISTING"
|
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>terminal --timeout=10 --dumb serial console</PRE
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></FONT
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></TD
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></TR
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></TABLE
|
|
></DIV
|
|
><P
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|
>This <I
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CLASS="CITETITLE"
|
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>HOWTO</I
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> does not discuss the use of
|
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<SPAN
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CLASS="APPLICATION"
|
|
>GRUB</SPAN
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|
>'s command line. It is far too
|
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complex and error-prone to recommend for use on production
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machines. Wizards will know to consult
|
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<SPAN
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CLASS="APPLICATION"
|
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>GRUB</SPAN
|
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>'s <SPAN
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CLASS="APPLICATION"
|
|
>info</SPAN
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>
|
|
manual for the commands required to boot the kernel.</P
|
|
><P
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|
><SPAN
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CLASS="APPLICATION"
|
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>GRUB</SPAN
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>'s menu's can be edited
|
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interactively after <B
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CLASS="KEYCAP"
|
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>P</B
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> is pressed and the password
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supplied. A better approach is to add menu items to boot the
|
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machine into alternative run levels. A sample configuration
|
|
showing a menu entry for the default run level and an alternative
|
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menu entry for single user mode (run level
|
|
<I
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|
CLASS="WORDASWORD"
|
|
>s</I
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|
>) is shown in <A
|
|
HREF="configure-boot-loader-grub.html#CONFIGURE-BOOT-LOADER-GRUB-RUNLEVEL"
|
|
>Figure 4-10</A
|
|
>. Remember to use
|
|
the <B
|
|
CLASS="COMMAND"
|
|
>lock</B
|
|
> command to require a password for
|
|
single user mode, as single user mode does not ask for a
|
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<SPAN
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CLASS="SYSTEMITEM"
|
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>Linux</SPAN
|
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> password.</P
|
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><DIV
|
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CLASS="FIGURE"
|
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><A
|
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NAME="CONFIGURE-BOOT-LOADER-GRUB-RUNLEVEL"
|
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></A
|
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><P
|
|
><B
|
|
>Figure 4-10. Adding a single user mode option to the
|
|
<SPAN
|
|
CLASS="APPLICATION"
|
|
>GRUB</SPAN
|
|
> menu</B
|
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></P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
|
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><FONT
|
|
COLOR="#000000"
|
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><PRE
|
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CLASS="PROGRAMLISTING"
|
|
>password --md5 $1$U$JK7xFegdxWH6VuppCUSIb.
|
|
default 0
|
|
title Red Hat Linux (2.4.9-21)
|
|
root (hd0,0)
|
|
kernel /vmlinuz-2.4.9-21 ro root=/dev/hda6
|
|
initrd /initrd-2.4.9-21.img
|
|
title Red Hat Linux (2.4.9-21) single user mode
|
|
lock
|
|
root (hd0,0)
|
|
kernel /vmlinuz-2.4.9-21 ro root=/dev/hda6 s
|
|
initrd /initrd-2.4.9-21.img</PRE
|
|
></FONT
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></DIV
|
|
><P
|
|
>File names in the <B
|
|
CLASS="COMMAND"
|
|
>kernel</B
|
|
> and
|
|
<B
|
|
CLASS="COMMAND"
|
|
>initrd</B
|
|
> commands are relative to the
|
|
<SPAN
|
|
CLASS="APPLICATION"
|
|
>GRUB</SPAN
|
|
> installation directory, which is
|
|
usually <TT
|
|
CLASS="FILENAME"
|
|
>/boot/grub</TT
|
|
>. So
|
|
<TT
|
|
CLASS="FILENAME"
|
|
>/vmlinuz-2.4.9-21</TT
|
|
> is actually the file
|
|
<TT
|
|
CLASS="FILENAME"
|
|
>/boot/grub/vmlinuz-2.4.9-21</TT
|
|
>.</P
|
|
><P
|
|
><SPAN
|
|
CLASS="APPLICATION"
|
|
>GRUB</SPAN
|
|
> is now configured to use the
|
|
serial console. The kernels booted from
|
|
<SPAN
|
|
CLASS="APPLICATION"
|
|
>GRUB</SPAN
|
|
> are yet to be configured to use the
|
|
serial console.</P
|
|
></DIV
|
|
><DIV
|
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="configure-boot-loader-lilo.html"
|
|
ACCESSKEY="P"
|
|
>Prev</A
|
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></TD
|
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
|
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><A
|
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HREF="index.html"
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ACCESSKEY="H"
|
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>Home</A
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><TD
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ALIGN="right"
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VALIGN="top"
|
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><A
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>Next</A
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><TR
|
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><TD
|
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WIDTH="33%"
|
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ALIGN="left"
|
|
VALIGN="top"
|
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>Configure the <SPAN
|
|
CLASS="APPLICATION"
|
|
>LILO</SPAN
|
|
> boot
|
|
loader</TD
|
|
><TD
|
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WIDTH="34%"
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
|
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>Configure the <SPAN
|
|
CLASS="APPLICATION"
|
|
>SYSLINUX</SPAN
|
|
> boot
|
|
loader</TD
|
|
></TR
|
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></TABLE
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> |