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[Launchpad Bug Tracker <1769682@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package initramfs-tools - 0.130ubuntu3.3

---------------
initramfs-tools (0.130ubuntu3.3) bionic; urgency=medium

  [ Scott Moser ]
  * scripts/functions: write netplan config files to /run/netplan for
    network devices configured with configure_networking. (LP: #1769682)

  [ Mathieu Trudel-Lapierre ]
  * scripts/functions: add 'critical: true' parameter; requires netplan
    0.36.2. (LP: #1769682)
  * debian/rules: skip tests on non-x86 architectures, where they then to be
    false negatives (extra macaddress matching makes the tests fail to match
    expected values).

  [ John Gallagher ]
  * Work out the kernel modules required to support ZFS filesystems and add
    them as necessary. (LP: #1661629)

 -- Mathieu Trudel-Lapierre <cyphermox@xxxxxxxxxx>  Mon, 20 Aug 2018
11:01:52 -0400

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

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https://bugs.launchpad.net/bugs/1769682

Title:
  NFS-based remote root hangs when running 'netplan apply'

Status in initramfs-tools package in Ubuntu:
  Fix Released
Status in netplan.io package in Ubuntu:
  Fix Released
Status in nplan package in Ubuntu:
  Invalid
Status in initramfs-tools source package in Xenial:
  Fix Committed
Status in netplan.io source package in Xenial:
  Invalid
Status in nplan source package in Xenial:
  Fix Released
Status in initramfs-tools source package in Artful:
  Won't Fix
Status in netplan.io source package in Artful:
  Invalid
Status in nplan source package in Artful:
  Fix Released
Status in initramfs-tools source package in Bionic:
  Fix Released
Status in netplan.io source package in Bionic:
  Fix Released
Status in nplan source package in Bionic:
  Invalid

Bug description:
  [Impact]
  Netboot users with a remote filesystem over NFS (possibly over other networked filesystems).

  [Test cases]
  1) Boot a system with its root filesystem over NFS.
  2) Run 'sudo netplan apply'
  3) Validate that the system remains responsive and keeps connectivity over the same IP address  as it had.

  [Regression potential]
  This SRU changes network properties, and enforces that networkd does not release and re-request an IP address from DHCP when it is restarted. Environments relying on the IP release/renew behavior may find themselves staying on the previous IP address, which might negatively impact connectivity. Changes in connectivity on a system running netplan should be investigated as a potential regression from this SRU. Other regression possibilities would include failure to get a new IP address over time (usually seen as losing connectivity) or possible IP conflicts on a network.

  ---

  With a system booted on the network, with its remote root fs on NFS:

  Running 'netplan apply' restarts systemd-networkd, which releases the
  IP received from DHCP. With no IP (and and IP potentially changing),
  the NFS server can't be reached so the system hangs.

  'netplan apply' or restarting systemd-networkd should not affect teh
  system, it should continue working normally despite "changing" network
  states, as long as the effective IP remains the same.

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