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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Robert Marshall <rmarshall@redhat.com>
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Date: Mon, 16 Mar 2015 16:34:51 -0400
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Subject: [PATCH] Update info with grub.cfg netboot selection order (#1148650)
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Added documentation to the grub info page that specifies the order
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netboot clients will use to select a grub configuration file.
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Resolves rhbz#1148650
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---
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docs/grub.texi | 42 ++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 42 insertions(+)
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diff --git a/docs/grub.texi b/docs/grub.texi
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index 2fd32608c01..a7155c22ffe 100644
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--- a/docs/grub.texi
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+++ b/docs/grub.texi
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@@ -2493,6 +2493,48 @@ grub-mknetdir --net-directory=/srv/tftp --subdir=/boot/grub -d /usr/lib/grub/i38
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Then follow instructions printed out by grub-mknetdir on configuring your DHCP
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server.
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+The grub.cfg file is placed in the same directory as the path output by
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+grub-mknetdir hereafter referred to as FWPATH. GRUB will search for its
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+configuration files in order using the following rules where the appended
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+value corresponds to a value on the client machine.
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+
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+@example
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+@group
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+@samp{(FWPATH)}/grub.cfg-@samp{(UUID OF NIC)}
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+@samp{(FWPATH)}/grub.cfg-@samp{(MAC ADDRESS OF NIC)}
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+@samp{(FWPATH)}/grub.cfg-@samp{(IPv4 OR IPv6 ADDRESS)}
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+@samp{(FWPATH)}/grub.cfg
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+@end group
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+@end example
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+
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+The client will only attempt to look up an IPv6 address config once, however,
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+it will try the IPv4 multiple times. The concrete example below shows what
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+would happen under the IPv4 case.
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+
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+@example
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+@group
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+UUID: 7726a678-7fc0-4853-a4f6-c85ac36a120a
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+MAC: 52:54:00:ec:33:81
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+IPV4: 10.0.0.130 (0A000082)
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+@end group
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+@end example
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+
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+@example
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+@group
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+@samp{(FWPATH)}/grub.cfg-7726a678-7fc0-4853-a4f6-c85ac36a120a
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+@samp{(FWPATH)}/grub.cfg-52-54-00-ec-33-81
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+@samp{(FWPATH)}/grub.cfg-0A000082
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+@samp{(FWPATH)}/grub.cfg-0A00008
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+@samp{(FWPATH)}/grub.cfg-0A0000
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+@samp{(FWPATH)}/grub.cfg-0A000
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+@samp{(FWPATH)}/grub.cfg-0A00
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+@samp{(FWPATH)}/grub.cfg-0A0
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+@samp{(FWPATH)}/grub.cfg-0A
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+@samp{(FWPATH)}/grub.cfg-0
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+@samp{(FWPATH)}/grub.cfg
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+@end group
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+@end example
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+
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After GRUB has started, files on the TFTP server will be accessible via the
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@samp{(tftp)} device.
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