[Bug 1923268] Re: grubnet default grub.cfg should try /grub/grub.cfg-${net_default_mac} before /grub/grub.cfg

[dann frazier]

On Wed, May 5, 2021 at 2:15 PM Lee Trager <1923268 at bugs.launchpad.net> wrote:
>
> When you added the ARM64 machine are you including the boot MAC address
> or just the IPMI credentials? When you add just the IPMI credentials the
> machine actually goes into enlistment but MAAS detects its a known
> machine based on IPMI credenitals when the BMC is detected.

The only MAC address I added was the BMC MAC - I didn't add any host
NIC MACs initially, so your explanation makes sense. Let me know if
it'd be helpful for you if I retested w/ host MACs though.

> The associated branch updates the default grub.cfg file which is stored
> with all boot images. These files only get updated when a new image is
> found on images.maas.io or whatever your mirror is. To force the update
> you can run
>
> sudo rm -rf /var/lib/maas/boot-resources/*
> sudo systemctl restart maas-rackd

Understood. We're still running a snap version, so I won't be able to
easily pick up a source code patch. We plan to switch back to a deb
install so we can be more agile in helping with testing patches, but
we haven't scheduled the downtime yet. I can always set up another
MAAS in the lab w/ debs if you need me to test something though.

  -dann

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https://bugs.launchpad.net/bugs/1923268

Title:
  grubnet default grub.cfg should try /grub/grub.cfg-${net_default_mac}
  before /grub/grub.cfg

Status in MAAS:
  Fix Committed
Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  MAAS uses the signed network GRUB bootloader when a machine network
  boots on AMD64 and ARM64. The configuration MAAS produces depends on
  the machine which are identified by MAC address. The default grub.cfg
  in the boot loader downloads /grub/grub.cfg from the remote host. As
  that doesn't provide the MAC address MAAS provides a default
  configuration file:

  configfile /grub/grub.cfg-${net_default_mac}
  configfile /grub/grub.cfg-default-amd64

  There are two issues with this:

  1. This causes an additional unnecessary request.
  2. It is assumed an known machine is amd64.

  Can the default grub.cfg embedded in grubnet<arch>.efi be updated to

  configfile /grub/grub.cfg-${net_default_mac}
  configfile /grub/grub.cfg-default-<ARCH>
  configfile /grub/grub.cfg

  This would be similar to what PXELinux[1] does.

  [1] https://wiki.syslinux.org/wiki/index.php?title=PXELINUX

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