80 lines
2.6 KiB
Text
80 lines
2.6 KiB
Text
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8 Booting GRUB from the network
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*******************************
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The following instructions don't work for *-emu, i386-qemu,
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i386-coreboot, i386-multiboot, mips_loongson, mips-arc and
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mips_qemu_mips
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To generate a netbootable directory, run:
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grub-mknetdir --net-directory=/srv/tftp --subdir=/boot/grub -d /usr/lib/grub/<platform>
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E.g. for i386-pc:
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grub-mknetdir --net-directory=/srv/tftp --subdir=/boot/grub -d /usr/lib/grub/i386-pc
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Then follow instructions printed out by grub-mknetdir on configuring
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your DHCP server.
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After GRUB has started, files on the TFTP server will be accessible
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via the '(tftp)' device.
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The server IP address can be controlled by changing the '(tftp)'
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device name to '(tftp,SERVER-IP)'. Note that this should be changed
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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
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inspect or change the behaviour of the PXE device. In the following
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description <INTERFACE> is placeholder for the name of network interface
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(platform dependent):
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'net_<INTERFACE>_ip'
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The network interface's IP address. Read-only.
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'net_<INTERFACE>_mac'
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The network interface's MAC address. Read-only.
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'net_<INTERFACE>_hostname'
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The client host name provided by DHCP. Read-only.
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'net_<INTERFACE>_domain'
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The client domain name provided by DHCP. Read-only.
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'net_<INTERFACE>_rootpath'
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The path to the client's root disk provided by DHCP. Read-only.
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'net_<INTERFACE>_extensionspath'
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The path to additional DHCP vendor extensions provided by DHCP.
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Read-only.
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'net_<INTERFACE>_boot_file'
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The boot file name provided by DHCP. Read-only.
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'net_<INTERFACE>_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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'net_<INTERFACE>_next_server'
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The IP address of the next (usually, TFTP) server provided by DHCP.
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Read-only.
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'net_default_interface'
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Initially set to name of network interface that was used to load
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grub. Read-write, although setting it affects only interpretation
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of 'net_default_ip' and 'net_default_mac'
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'net_default_ip'
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The IP address of default interface. Read-only. This is alias for
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the 'net_${net_default_interface}_ip'.
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'net_default_mac'
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The default interface's MAC address. Read-only. This is alias for
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the 'net_${net_default_interface}_mac'.
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'net_default_server'
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The default server used by network drives (*note Device syntax::).
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Read-write, although setting this is only useful before opening a
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network device.
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