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[PATCH v3 5/5] docs: Update info with grub.cfg netboot selection order

From: Javier Martinez Canillas
Subject: [PATCH v3 5/5] docs: Update info with grub.cfg netboot selection order
Date: Tue, 22 Oct 2019 10:48:14 +0200

From: Robert Marshall <address@hidden>

Add documentation to the grub info page that specifies the order
netboot clients use to select a grub configuration file.

Signed-off-by: Robert Marshall <address@hidden>
Signed-off-by: Javier Martinez Canillas <address@hidden>


Changes in v3:
- Add a patch documenting the grub.cfg netboot selection order.

Changes in v2: None

 docs/grub.texi | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/docs/grub.texi b/docs/grub.texi
index 5ac61c09d1b..e7c5b1968b3 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -2486,6 +2486,48 @@ grub-mknetdir --net-directory=/srv/tftp 
--subdir=/boot/grub -d /usr/lib/grub/i38
 Then follow instructions printed out by grub-mknetdir on configuring your DHCP
+The grub.cfg file is placed in the same directory as the path output by
+grub-mknetdir hereafter referred to as FWPATH. GRUB will search for its
+configuration files in order using the following rules where the appended
+value corresponds to a value on the client machine.
+@samp{(FWPATH)}/grub.cfg-@samp{(UUID OF NIC)}
+@samp{(FWPATH)}/grub.cfg-@samp{(MAC ADDRESS OF NIC)}
+@samp{(FWPATH)}/grub.cfg-@samp{(IPv4 OR IPv6 ADDRESS)}
+@end group
+@end example
+The client will only attempt to look up an IPv6 address config once, however,
+it will try the IPv4 multiple times. The concrete example below shows what
+would happen under the IPv4 case.
+UUID: 7726a678-7fc0-4853-a4f6-c85ac36a120a
+MAC:  52:54:00:ec:33:81
+IPV4: (0A000082)
+@end group
+@end example
+@end group
+@end example
 After GRUB has started, files on the TFTP server will be accessible via the
 @samp{(tftp)} device.

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