pxeboot man page on OpenBSD

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PXEBOOT(8)	    OpenBSD System Manager's Manual (i386)	    PXEBOOT(8)

     pxeboot - i386-specific second-stage PXE bootstrap

     pxeboot is a modified version of the i386 second-stage bootstrap program,
     boot(8), configured to run under Intel's Preboot Execution Environment
     (PXE).  PXE is a form of smart boot ROM, built into many Ethernet cards
     from Intel, 3Com, and other manufacturers.

     The computer's PXE boot ROM contacts a DHCP server by broadcasting a
     request on the network.  It gets an IP address from the DHCP server, then
     it is told the name of the boot program to download -- in this case, the
     boot program is pxeboot.  The ROM downloads the boot program using TFTP,
     then executes it.

     The pxeboot boot program will look for an /etc/boot.conf configuration
     file on the TFTP server.  If it finds one, it processes the commands
     within it.	 boot.conf processing can be skipped by holding down either
     Control key as pxeboot starts.

     pxeboot then sits in a loop, processing commands given by the user.  It
     accepts all the commands accepted by boot(8).

     If no commands are given for a short time, pxeboot will then attempt to
     load the OpenBSD kernel bsd via TFTP.  It may be told to boot an
     alternative kernel, either by commands in the boot.conf file, or by
     commands typed by the user at the boot> prompt.  pxeboot can be used for
     diskless(8) setups or to load the bsd.rd install kernel for network

     To prepare a server to support network booting, the dhcpd(8) and tftpd(8)
     services should be enabled and configured.	 It may help to use the -s
     option with tftpd(8), to avoid confusion between files for the server's
     system and files for the client system (note that -s is set by default in
     OpenBSD).	ftpd(8) or httpd(8) should be enabled, depending on how the
     install sets will be made available.

     pxeboot and the kernel should be copied into the TFTP server's root
     directory (typically /tftpboot).  A boot.conf file may be created if
     required (e.g. /tftpboot/etc/boot.conf).

     A sample configuration file for dhcpd(8) might be as follows:

	   option domain-name "example.com";
	   option routers;
	   option subnet-mask;
	   option broadcast-address;
	   option domain-name-servers;
	   server-name "DHCPserver";

	   default-lease-time 120;
	   max-lease-time 120;

	   subnet netmask {
	       filename "pxeboot";

     See dhcpd(8) and dhcpd.conf(5) for more information.

     /usr/mdec/pxeboot	  PXE-specific second-stage bootstrap
     /etc/boot.conf	  pxeboot configuration file (read from TFTP server)
     /etc/dhcpd.conf	  DHCPD configuration file
     /tftpboot		  Default root directory for tftpd(8)

     Boot the install kernel:

	   boot> bsd.rd

     The same thing:

	   boot> boot tftp:bsd.rd

     dhcpd.conf(5), boot(8), boot_i386(8), dhcpd(8), diskless(8), httpd(8),

     Intel Corporation, Preboot Execution Environment (PXE) Specification,
     Version 2.1, September 20, 1999.

     The pxeboot command first appeared in OpenBSD 3.5.

OpenBSD 4.9		       January 16, 2009			   OpenBSD 4.9

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