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An other article about DISKLESS

2009-05-13 00:52:14来源：未知阅读 ()

OpenBSD diskless
   The final target for an OpenBSD install on the net4521 is a
CompactFlash
card.
   However during development it would be inefficient to
   continually update the image, plus CF has a limited number of
   writes per sector.  A better solution is to boot over the
   network.

   The network boot sequence is documented in
   diskless(8) which is a good starting point.  However the
   process described there is geared towards booting Unix servers,
   booting on Intel machines is potentially a bit different:

The network card loads a built in PXE loader

The PXE loader gets an IP address and boot loader from DHCP

The boot loader downloads the OpenBSD kernel via TFTP

The kernel boots and mounts its root and swap on NFS

From that point the system boots as usual.
Firmware and the Boot Loader

   i386 compatible PCs have a very primitive firmware, the BIOS,
   which usually doesn't support advanced features like network
   booting.  However Intel developed a proprietary booting solution
   called PXE.  Some network cards come with a PXE loader in ROM
   and those cards can boot an operating system from the network.
   Naturally, the Soekris also supports PXE and so will load the
   boot loader from the network

   Since version 3.5 OpenBSD has come with a PXE boot loader called

pxeboot
.
   Prior to that you needed a third party boot loader like
grub
, an
older version
of this page
   describes how to use it.

pxeboot

   In order to find an operating system's boot loader the PXE
   loader consults a DHCP server.  The DHCP server must be
   configured to not only give out an IP address but also the boot
   loader.  This is done simply by adding a "filename" option to
dhcpd.conf
:

      shared-network WIRED-NET {
   option domain-name-servers 192.168.1.1;
   subnet 192.168.1.0 netmask 255.255.255.0 {
      option routers 192.168.1.1;

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