[Bug 1820929] Re: netplan should consider adding more udev attribute for exact matching of failover 3-netdev interfaces

[Łukasz Zemczak]

Hello Si-Wei, or anyone else affected,

Accepted initramfs-tools into bionic-proposed. The package will build
now and be available at https://launchpad.net/ubuntu/+source/initramfs-
tools/0.130ubuntu3.11 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
bionic to verification-done-bionic. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-bionic. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: initramfs-tools (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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https://bugs.launchpad.net/bugs/1820929

Title:
  netplan should consider adding more udev attribute for exact matching
  of failover 3-netdev interfaces

Status in netplan:
  Triaged
Status in initramfs-tools package in Ubuntu:
  New
Status in netplan.io package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  Incomplete
Status in initramfs-tools source package in Bionic:
  Fix Committed
Status in netplan.io source package in Bionic:
  New
Status in systemd source package in Bionic:
  New

Bug description:
  [Impact]

  * At present, virtual machines utilizing net_failover network
  interface configurations are incorrectly configured due to the
  reliance on the MAC address to identify specific network interfaces.
  When net_failover is utilized, multiple interfaces will bear the same
  MAC address (the net_failover master itself, as well as the interfaces
  subordinate to it), rendering the MAC address ineffective for unique
  identification of the interface.  This results in incorrect naming of
  network interfaces from the "set-name" directive in the netplan
  configuration.

  * The solution here is to use the interface name instead of the MAC
  address when the interface is a net_failover master device.  Logic is
  added on initramfs-tools to check the device type and virtio flags to
  apply this change only to net_failover master devices.

  [Test Case]

  * The change can be tested by configuring a virtual machine with a
  virtio_net network device with the "failover=on" option to the
  "-device" option to qemu, e.g.,

  -device virtio-net-
  pci,netdev=hostnet0,id=net0,bus=pci.0,addr=0x3,mac=00:00:17:00:18:04,failover=on

  * This will set the virtio device "standby" feature bit (bit 62,
  counting from 0).  This requires a version of qemu with support for
  this feature.

  * When so configured, the netplan configuration generated by initramfs
  will not contain a "macaddress:" match directive for the network
  interface in question.

  [Regression Potential]

  * Erroneous identification of a network interface as a net_failover
  master device could lead to omission of a macaddress directive,
  causing interfaces to be incorrectly named.

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