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PXEBOOT(8)	       BSD/amd64 System	Manager's Manual	    PXEBOOT(8)

     pxeboot --	amd64-specific second-stage PXE	bootstrap

     pxeboot is	a modified version of the amd64	second-stage bootstrap pro-
     gram, boot(8), configured to run under Intel's Preboot Execution Environ-
     ment (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 re-
     quest 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 alterna-
     tive 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 in-

     To	prepare	a server to support network booting, the dhcpd(8) and tftpd(8)
     services should be	enabled	and configured.

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

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

	   option domain-name "";
	   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";

     Since amd64 systems boot up as i386 systems, their	PXE ROMs typically set
     the PXE client system architecture	to be the same as for i386.  This
     means that	the DHCP option	vendor-class-identifier	cannot,	therefore, be
     used to distinguish between i386 and amd64	systems.

     Instead, the client machine identifier (UUID) or hardware Ethernet	ad-
     dress (MAC) should	be used.  See dhcpd(8) and dhcpd.conf(5) for more in-

     /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_amd64(8), dhcpd(8), diskless(8), tftpd(8)

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

     The pxeboot command first appeared	in OpenBSD 3.5.

BSD				 May 20, 2014				   BSD


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