This bug was fixed in the package netplan.io - 0.37.1
---------------
netplan.io (0.37.1) cosmic; urgency=medium
* tests/integration.py: fix autopkgtests to be less flaky, especially given
changes in systemd-networkd's behavior regarding Router Advertisements.
-- Mathieu Trudel-Lapierre <cypher...@ubuntu.com> Fri, 11 May 2018
09:58:19 -0400
** Changed in: netplan.io (Ubuntu)
Status: New => 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:
New
Status in netplan.io package in Ubuntu:
Fix Released
Status in nplan package in Ubuntu:
Invalid
Status in initramfs-tools source package in Xenial:
New
Status in netplan.io source package in Xenial:
Invalid
Status in nplan source package in Xenial:
Fix Committed
Status in initramfs-tools source package in Artful:
New
Status in netplan.io source package in Artful:
Invalid
Status in nplan source package in Artful:
Fix Committed
Status in initramfs-tools source package in Bionic:
New
Status in netplan.io source package in Bionic:
Fix Committed
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.
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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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