Please provide the contents of /etc/netplan on the affected systems, and
please let me know, if removing files in said directory makes networkd
ignore interfaces.
Please provide output of $ networkctl
By default, if there is no netplan configuration, networkd does not
"force use of systemd-networkd" and "does not interferes with ifupdown".
Thus specifics about your system are required to describe the bug in
detail and/or eventually fix Ubuntu or specific systems in question.
** Changed in: systemd (Ubuntu)
Status: New => Incomplete
** Also affects: ifupdown (Ubuntu)
Importance: Undecided
Status: New
** Changed in: ifupdown (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1771236
Title:
forced use of systemd-networkd interferes with ifupdown in 18.04
Status in ifupdown package in Ubuntu:
Incomplete
Status in systemd package in Ubuntu:
Incomplete
Bug description:
For several reasons, we are not able to use netplan nor systemd-
networkd due to legacy applications that expect ifupdown's pre-up and
post-up script mechanism. The documentation around 18.04's
(premature, I feel) wholesale adoption of netplan claims that one can
revert to old behaviour by merely installing ifupdown (amongst
assertions that netplan will never offer a mechanism for configuring
pre-up and post-up actions even for network managers that support
them).
However when ifupdown is installed, systemd-networkd still tries to
manage interfaces. If you 'systemctl disable systemd-networkd', upon
next reboot it is automatically re-enabled. We tried disabling any
systemd units even remotely related to networking and yet systemd-
networkd still runs. If it hasn't been configured, it tries to DHCP.
On networks that don't provide DHCP this results in a stupendously
long stall during boot. Currently it appears to be impossible to tell
systemd-networkd not to run in a clean manner that won't get reverted
on package upgrades.
I sincerely hope this is is a bug/oversight and not intentional. We
need to be able to disable systemd-networkd properly.
Thanks
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