503 lines
7.2 KiB
HTML
503 lines
7.2 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Configure the LILO boot
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loader</TITLE
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><META
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NAME="GENERATOR"
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>Remote Serial Console HOWTO</TH
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WIDTH="10%"
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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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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-LILO"
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></A
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>4.1. Configure the <SPAN
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CLASS="APPLICATION"
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>LILO</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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>LILO</SPAN
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> is the Linux Boot Loader used
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on Intel machines. Other boot loaders for Intel machines exist,
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common alternatives are <SPAN
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CLASS="APPLICATION"
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>GRUB</SPAN
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> and
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<SPAN
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CLASS="APPLICATION"
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>SYSLINUX</SPAN
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>. Equivalents to
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<SPAN
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CLASS="APPLICATION"
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>LILO</SPAN
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> exist for other processor
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architectures, their names are usually some play upon
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<SPAN
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CLASS="QUOTE"
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>"LILO"</SPAN
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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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>LILO</SPAN
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> is documented in the
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<I
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CLASS="CITETITLE"
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>lilo(8)</I
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> and
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<I
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CLASS="CITETITLE"
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>lilo.conf(5)</I
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> manual pages; the
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<I
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CLASS="CITETITLE"
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><SPAN
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CLASS="APPLICATION"
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>LILO</SPAN
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> Generic boot loader for
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Linux … User's Guide</I
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> found in the file
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<TT
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CLASS="FILENAME"
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>/usr/share/doc/lilo…/doc/User_Guide.ps</TT
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>;
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and the <A
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HREF="http://www.tldp.org/HOWTO/mini/LILO.html"
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TARGET="_top"
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><I
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CLASS="CITETITLE"
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>LILO
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mini-HOWTO</I
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></A
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>.</P
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><P
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>The <SPAN
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CLASS="APPLICATION"
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>LILO</SPAN
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> configuration is kept in
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the file <TT
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CLASS="FILENAME"
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>/etc/lilo.conf</TT
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>. The first part of
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the file applies to all images. The following parts are
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<TT
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CLASS="LITERAL"
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>image</TT
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> descriptions for each kernel.</P
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><P
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>Set <SPAN
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CLASS="APPLICATION"
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>LILO</SPAN
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> to use the serial port.
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The syntax of the serial line parameters follows that used by the
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kernel.</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-LILO-SYNTAX"
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></A
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><P
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><B
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>Figure 4-1. Syntax of <SPAN
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CLASS="PRODUCTNAME"
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>LILO</SPAN
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>
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<B
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CLASS="COMMAND"
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>serial</B
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> command, in
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<SPAN
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CLASS="ACRONYM"
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>EBNF</SPAN
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></B
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></P
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><P
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CLASS="LITERALLAYOUT"
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>serial=<TT
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CLASS="REPLACEABLE"
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><I
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><serial_port></I
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></TT
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>[,<TT
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CLASS="REPLACEABLE"
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><I
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><speed></I
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></TT
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>[<TT
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CLASS="REPLACEABLE"
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><I
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><parity></I
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></TT
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>[<TT
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CLASS="REPLACEABLE"
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><I
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><data></I
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></TT
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>]]]</P
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></DIV
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><P
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>Where the variables are the same as used by the kernel (shown
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in <A
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HREF="preparation-setspeed.html#PREPARATION-SETSPEED-MODESYNTAX"
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>Figure 2-7</A
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>) and:</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-LILO-EBNF"
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></A
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><P
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><B
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>Figure 4-2. <SPAN
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CLASS="PRODUCTNAME"
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>LILO</SPAN
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> <B
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CLASS="COMMAND"
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>serial</B
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>
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<SPAN
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CLASS="ACRONYM"
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>EBNF</SPAN
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> variables</B
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></P
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><P
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CLASS="LITERALLAYOUT"
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><TT
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CLASS="REPLACEABLE"
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><I
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><serial_port></I
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></TT
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> ::= <TT
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CLASS="LITERAL"
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>0</TT
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> | <TT
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CLASS="LITERAL"
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>1</TT
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>| … | <TT
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CLASS="LITERAL"
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>3</TT
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></P
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></DIV
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><P
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>Our examples use <TT
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CLASS="FILENAME"
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>/dev/ttyS0</TT
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>, which
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<SPAN
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CLASS="APPLICATION"
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>LILO</SPAN
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> knows as port
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<TT
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CLASS="LITERAL"
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>0</TT
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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-LILO-CONFIGURATION"
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></A
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><P
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><B
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>Figure 4-3. <SPAN
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CLASS="APPLICATION"
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>LILO</SPAN
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> boot loader sample configuration</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=0,9600n8
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timeout=100
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restricted
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password=<TT
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CLASS="REPLACEABLE"
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><I
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>PASSWORD</I
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></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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>The parameters <TT
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CLASS="LITERAL"
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>restricted</TT
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> and
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<TT
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CLASS="LITERAL"
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>password</TT
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> are used to avoid someone dialing in,
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booting the machine, and stepping around the Linux access
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permissions by typing:</P
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><DIV
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CLASS="EXAMPLE"
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><A
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NAME="CONFIGURE-BOOT-LOADER-LILO-HACK"
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></A
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><P
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><B
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>Example 4-1. Using kernel parameters to avoid access permissions</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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>LILO:</TT
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> <B
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CLASS="COMMAND"
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>linux init=/sbin/sash</B
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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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>The password should be good, as it can be used to gain
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<SPAN
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CLASS="SYSTEMITEM"
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>root</SPAN
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> access. The
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<SPAN
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CLASS="APPLICATION"
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>LILO</SPAN
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> password is stored in plain text in
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the configuration file, so it should never be the same as any other
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password. The permissions on the configuration file should be set
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so that only <SPAN
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CLASS="SYSTEMITEM"
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>root</SPAN
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> can
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read <TT
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CLASS="FILENAME"
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>/etc/lilo.conf</TT
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>.</P
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><DIV
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CLASS="INFORMALFIGURE"
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><A
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NAME="AEN922"
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></A
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><P
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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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>bash#</TT
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> <B
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CLASS="COMMAND"
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>chmod u=rw,go= /etc/lilo.conf</B
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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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><P
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></P
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></DIV
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><P
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><SPAN
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CLASS="APPLICATION"
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>LILO</SPAN
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> has an option to display a
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boot message. This does not work with serial consoles. Remove any
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lines like:</P
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><DIV
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CLASS="INFORMALFIGURE"
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><A
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NAME="CONFIGURE-BOOT-LOADER-LILO-REMOVE-MESSAGE"
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></A
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><P
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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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>message=/boot/message</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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><P
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></P
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></DIV
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><P
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><SPAN
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CLASS="APPLICATION"
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>LILO</SPAN
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> is now configured to use the
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serial console. The kernels booted from
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<SPAN
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CLASS="APPLICATION"
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>LILO</SPAN
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> are yet to be configured to use the
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serial console.</P
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></DIV
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><DIV
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>Configure the boot loader</TD
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><TD
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VALIGN="top"
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>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</TD
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