* docs/grub.texi (Network): New section.
(Device syntax): The network device is called `(pxe)' in GRUB 2, not `(nd)' as in GRUB Legacy. (pxe_unload): New section.
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Colin Watson
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2010-06-07 Colin Watson <cjwatson@ubuntu.com>
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* docs/grub.texi (Network): New section.
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(Device syntax): The network device is called `(pxe)' in GRUB 2, not
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`(nd)' as in GRUB Legacy.
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(pxe_unload): New section.
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2010-06-07 Colin Watson <cjwatson@ubuntu.com>
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* docs/grub.texi (Troubleshooting): `echo' is not usually available
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@ -970,6 +970,78 @@ that file, making sure to leave at least the first two lines intact.
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@section Writing full configuration files directly
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@node Network
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@chapter Booting GRUB from the network
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The following instructions only work on PC BIOS systems where the Preboot
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eXecution Environment (PXE) is available.
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To generate a PXE boot image, run:
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@example
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@group
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grub-mkimage --format=i386-pc --output=core.img --prefix='(pxe)/boot/grub' pxe pxecmd
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cat /boot/grub/pxeboot.img core.img >grub.pxe
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@end group
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@end example
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Copy @file{grub.pxe}, @file{/boot/grub/*.mod}, and @file{/boot/grub/*.lst}
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to the PXE (TFTP) server, ensuring that @file{*.mod} and @file{*.lst} are
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accessible via the @file{/boot/grub/} path from the TFTP server root. Set
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the DHCP server configuration to offer @file{grub.pxe} as the boot file (the
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@samp{filename} option in ISC dhcpd).
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After GRUB has started, files on the TFTP server will be accessible via the
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@samp{(pxe)} device.
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The server and gateway IP address can be controlled by changing the
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@samp{(pxe)} device name to @samp{(pxe:@var{server-ip})} or
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@samp{(pxe:@var{server-ip}:@var{gateway-ip})}. Note that this should be
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changed both in the prefix and in any references to the device name in the
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configuration file.
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GRUB provides several environment variables which may be used to inspect or
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change the behaviour of the PXE device:
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@table @samp
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@item net_pxe_ip
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The IP address of this machine. Read-only.
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@item net_pxe_mac
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The network interface's MAC address. Read-only.
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@item net_pxe_hostname
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The client host name provided by DHCP. Read-only.
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@item net_pxe_domain
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The client domain name provided by DHCP. Read-only.
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@item net_pxe_rootpath
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The path to the client's root disk provided by DHCP. Read-only.
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@item net_pxe_extensionspath
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The path to additional DHCP vendor extensions provided by DHCP. Read-only.
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@item net_pxe_boot_file
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The boot file name provided by DHCP. Read-only.
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@item net_pxe_dhcp_server_name
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The name of the DHCP server responsible for these boot parameters.
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Read-only.
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@item net_pxe_blksize
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The PXE transfer block size. Read-write, defaults to 512.
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@item pxe_default_server
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The default PXE server. Read-write, although setting this is only useful
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before opening a PXE device.
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@item pxe_default_gateway
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The default gateway to use when contacting the PXE server. Read-write,
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although setting this is only useful before opening a PXE device.
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@end table
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@node Serial terminal
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@chapter Using GRUB via a serial line
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@ -1094,7 +1166,7 @@ MBR when installing GRUB), while the syntax @samp{(hd0,1)}
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represents using the first partition of the disk (or the boot sector
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of the partition when installing GRUB).
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If you enabled the network support, the special drive, @samp{(nd)}, is
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If you enabled the network support, the special drive @samp{(pxe)} is
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also available. Before using the network drive, you must initialize the
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network. @xref{Network}, for more information.
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@ -1422,6 +1494,7 @@ you forget a command, you can run the command @command{help}
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* password:: Set a clear-text password
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* password_pbkdf2:: Set a hashed password
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* play:: Play a tune
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* pxe_unload:: Unload the PXE environment
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* reboot:: Reboot your computer
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* search:: Search devices by file, label, or UUID
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* set:: Set an environment variable
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@ -1792,6 +1865,16 @@ a rest.
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@end deffn
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@node pxe_unload
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@subsection pxe_unload
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@deffn Command pxe_unload
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Unload the PXE environment (@pxref{Network}).
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This command is only available on PC BIOS systems.
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@end deffn
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@node reboot
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@subsection reboot
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