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Etherboot command-line

Network Interfaces

Etherboot names interfaces following the pattern “net#”.

ifstat [interfaces…] Displays information and statistics about the specified interface. If no interface is specified, displays information about all detected interfaces. Information includes MAC address, PCI bus/slot/function identiers, and packet counts.

ifopen [interfaces…] Opens the specified interfaces. If no interface is specified, opens all interfaces.

ifclose [interfaces…] Closes the specified interfaces. If no interface is specified, closes all interfaces.

dhcp <interface> Attempts to configure the specified network interface using DHCP. Also opens the interface.

Working with images

imgfetch [-n|–name <image name>] <filename> [arguments…] Retrieves an image file, giving it a specified name, and prepares it to be executed with the specified arguments. File name may be a simple path, or an HTTP URL. Simple paths are assumed to be located on the TFTP server specified by dhcp or config. If image name is not specified, the base filename will be used as the name.

module [-n|–name <image name>] <filename> [arguments…] Equivalent to imgfetch

initrd [-n|–name <image name>] <filename> [arguments] Equivalent to imgfetch

imgargs <image name> Set or change the arguments for the specified image name.

imgload <image name> Prepares an executable image to be executed.

imgfree Remove all fetched/loaded images.

kernel [-n|–name <image name>] <filename> [arguments] Fetch and load a bzImage format Linux kernel. Equivalent to an imgfetch followed by imgload.

Runtime configuration

config [scope] Enter a GUI to set up runtime configuration. On some systems (cards) this may be stored in NVRAM. Scope allows setting up options within a specific context. Known scopes: [interface name]. If unspecified, the system default scope will be used.

set <identifier> <value> Set the value of identifier to value

show <identifier> Display the value of identifier

clear <identifier> Clear the value of identifier

Identifiers

Where there is correspondence between the gPXE option and a DHCP option, options specified by the DHCP server will be pre-filled.

uuid The system's UUID

hostname The system's hostname. Sent to the DHCP server for dynamic DNS changes, or specified by the DHCP server. Equivalent to DHCP option 12 (host name)

filename The boot image to be loaded. Equivalent to DHCP option 67 (Bootfile name)

root-path NFS/iSCSI root path. The path to a network root filesystem. Equivalent to DHCP option 17 (Root Path)

username

password

priority

ip The system's IPv4 address

netmask The system's IPv4 subnet mask

gateway The system's default gateway

mac The system's MAC address

dhcp-server The dhcp server from which settings were obtained

dns-server The DNS server to use for resolving hostnames

next-server The (TFTP) server from which to obtain files when not specifying an HTTP URL

initiator_iqn_setting The iSCSI initiator name

Other

autoboot Attempts to boot the system

exit Exits gPXE, and passes boot control back to the BIOS.

sanboot Attempts to boot the system from a SAN device.

Outstanding questions

  • What does autoboot do? Does it simply execute a script, pre-defined at compile time? Does it follow its own sequence of boot operations?
  • When multiple images of the same name are fetched, which one will takes precedence?
  • What does the initrd command do that's special? It obviously sets the image type to initrd, but what's the effect of that? Is there a way to specify the type of a loaded image after the fact?

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