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[Launchpad Bug Tracker <1709135@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 232-21ubuntu7

---------------
systemd (232-21ubuntu7) zesty; urgency=medium

  * networkd: accept `:' in ifnames in systemd/networkd. (LP: #1714933)
  * networkd: add support for ActiveSlave and PrimarySlave netdev options.
    (LP: #1709135)
  * Cherrypick upstream fix for a race between .mount and .automount units,
    which currently may result in automounts hanging. (LP: #1709649)
  * systemd.postinst: Fix-up version number check in the previous sru.
    The version check in the postinst was too tight, thus the SRU fix failed
    validation. (LP: #1710410)

systemd (232-21ubuntu6) zesty; urgency=medium

  * link: Fix offload features initialization.
    This fixes a regression introduced in v232 which caused TCP
    segmentation offloads being disabled by default, resulting in
    significant performance issues under certain conditions. (Closes: #864073)
    (LP: #1703393)
  * loginctl: Fix loginctl ignoring user given session IDs at command-line
    (LP: #1682154)
  * Disable fallback DNS servers.
    This causes resolved to call-home to google, attempt to access network when
    none is available, and spams logs. (LP: #1449001)
  * initramfs-tools: trigger udevadm add actions with subsystems first.
    This updates the initramfs-tools init-top udev script to trigger udevadm
    actions with type specified. This mimicks the
    systemd-udev-trigger.service. Without type specified only devices are
    triggered, but triggering subsystems may also be required and should happen
    before triggering the devices. This is the case for example on s390x with zdev
    generated udev rules. (LP: #1713536)
  * Enable systemd-resolved by default. (LP: #1710410)
  * core: fix systemd failing to serialize tasks correctly on daemon-reload.
    (LP: #1702823)

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Wed, 04 Oct 2017 14:22:02
+0100

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

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https://bugs.launchpad.net/bugs/1709135

Title:
  add bond primary parameter

Status in nplan package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in nplan source package in Xenial:
  Fix Committed
Status in systemd source package in Xenial:
  Fix Released
Status in nplan source package in Zesty:
  Fix Committed
Status in systemd source package in Zesty:
  Fix Released
Status in nplan source package in Artful:
  Fix Released
Status in systemd source package in Artful:
  Fix Released

Bug description:
  [Impact]
  Some complex bond configurations require setting a "primary" interface for the bond, or setting this greatly improves performance on the network bond.

  [Test case]
  See below for a configuration example.
  1) Apply configuration on a system with netplan.
  2) Run 'netplan apply'
  3) Validate that netplan apply does not return with an error
  4) Validate that netplan properly sets the "primary_slave" value on the bond. This can be verified by looking at /sys/class/net/<bond interface>/bonding/primary_slave.
  5) Validate that there are no parsing errors from systemd-networkd in the journalctl

  [Regression potential]
  If existing configuration fails to be parsed, or lack of primary interface breaks configuration for existing bonds, this would be a regression caused by this update.

  ---

  ifenslave/eni support a bond parameter:  bond-primary which accepts an
  interface name that can be used to tell the kernel bonding driver
  which interface it should preferred in active-backup (and other
  modes).  This config option is missing in netplan.

   % cat bond-primary.yaml
  network:
    version: 2
    ethernets:
      eth0:
        match:
          driver: virtio
      ens4:
        match:
          driver: e1000
    bonds:
      bond0:
        parameters:
          mode: active-backup
          mii-monitor-interval: 100
          primary: e1000
        dhcp4: true

  % ./generate -r `pwd`/target
  Error in network definition /home/rharper/work/git/netplan/target//etc/netplan/bond-primary.yaml line 12 column 8: unknown key primary

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