[Bug 1915288] Re: grub 2.04 net does not like deployments with kvm maas pods

[Launchpad Bug Tracker]

This bug was fixed in the package grub2 - 2.04-1ubuntu40

---------------
grub2 (2.04-1ubuntu40) hirsute; urgency=medium

  * Revert: rhboot-f34-tcp-add-window-scaling-support.patch,
    rhboot-f34-support-non-ethernet.patch,
    ubuntu-fixup-rhboot-f34-support-non-ethernet.patch,
    ubuntu-fixup-rhboot-f34-support-non-ethernet-2.patch: these break MAAS
    LXD KVM pod deployments. LP: #1915288

grub2 (2.04-1ubuntu39) hirsute; urgency=medium

  * Cherrypick a bunch of patches:
    - fix crash in http LP: #1915288
    - add bootp6 documentation
    - add support for UEFI boot protocols
    - use UEFI protocols for http & https networking
    - make netboot search for by-mac/by-uuid/by-ip for grub.cfg
    - update documentation for netboot search paths of grub.cfg
  * Make prebuilt netboot image look for MAAS grub.cfg
  * Fix grub-initrd-fallback.service thanks to JawnSmith LP: #1910815

grub2 (2.04-1ubuntu38) hirsute; urgency=medium

  [ Jean-Baptiste Lallement ]
  [ Didier Roche ]
  * Fix warnings during grub menu generation.  Thanks wdoekes for the patch
    (LP: #1898177)
    - Fix warnings when bpool doesn't exist.
    - Fix warnings when snapshot name contains dashes.
  * Do not fail to generate grub menu when name of the snapshot contains
    spaces. (LP: #1903524)

 -- Dimitri John Ledkov <xnox at ubuntu.com>  Fri, 12 Feb 2021 20:29:16
+0000

** Changed in: grub2 (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1915288

Title:
  grub 2.04  net does not like deployments with kvm maas pods

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Focal:
  Fix Released
Status in grub2 source package in Groovy:
  Fix Released

Bug description:
  [Impact]

   * MAAS KVM LXD pods fail to deploy, in very beefy servers.

   1) cherrypick upstream fix that caused crash upon completion of http
  networking

   2) revert patches that add support for TCP window scaling and non-
  ethernet cards

  With above changes one can deploy 100 out of 100 MAAS KVM LXD pods
  using the patched grubnetx86.efi

  
  [Test Case]

   * Configure maas

   * Configure networking for lxd kvm pods

   * Deploy ubuntu focal on a node

   * Manually init lxd, allow netowrking, add remote password

   * Add kvm lxd host in the kvm page of maas

   * Disable image syncing in maas

   * replace /var/snap/maas/common/maas/boot-
  resources/current/bootloader/uefi/amd64/grubx64.efi with the signed
  grubnetx64.efi.signed from the grub-efi-amd64-signed package

   * compose & commision hundred nodes with cli api:

  for i in `seq 100`; do maas ps5 vmhost compose 8; done

  (where 8 is the id of the kvm host, see url for the kvm node in
  question)

  Without these patches failure rate is up to 30%. With these patches
  100 out of 100 pods deploy fine.

  Thus one should be ok testing with less number of pods too.

  [Where problems could occur]

   * These patches mean that we are using smaller (same ones we did in
  bionic) TCP window, thus for very large kernels/initrds we may hit
  http timeouts on the server. Also it means that throughput speed of
  deployments is lower again.

  * However it is better to deploy where we used to deploy before, than
  failing to deploy small things on small networks.

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