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[Launchpad Bug Tracker <1769682@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package netplan.io - 0.36.2

---------------
netplan.io (0.36.2) bionic; urgency=medium

  * doc/netplan.md: Clarify the behavior for time-based values for bonds
    and bridges. (LP: #1756587)
  * critical: provide a way to set "CriticalConnection=true" on a networkd
    connection, especially for remote-fs scenarios. (LP: #1769682)

 -- Mathieu Trudel-Lapierre <cyphermox@xxxxxxxxxx>  Tue, 08 May 2018
15:33:48 -0400

** Changed in: netplan.io (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:
  Confirmed
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:
  Confirmed
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:
  Confirmed
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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