Public bug reported:
I started a system with cloud-init disabled, etc. and a single real
network interface (ens3) that could be configured.
That VM has no configuration whatsoever for systemd-networkd, as that
would have to have been written by netplan, and cloud-init did not
generate netplan config (because it was disabled).
So:
root@ubuntu:/etc/systemd/system/network-online.target.wants# ip route
d-networkd-wait-online --ignore=lo
ignoring: lo
Event loop failed: Connection timed out
root@ubuntu:/etc/systemd/system/network-online.target.wants# ip route
root@ubuntu:/etc/systemd/system/network-online.target.wants# networkctl
IDX LINK TYPE OPERATIONAL SETUP
1 lo loopback carrier unmanaged
2 ens3 ether off unmanaged
3 sit0 sit off unmanaged
3 links listed.
root@ubuntu:/etc/systemd/system/network-online.target.wants#
The system took 120 seconds to complete boot, because wait-online had to
finish; and running wait-online from the system afterwards also waits 120
seconds (its default timeout). If there is no configuration for an interface,
it's unmanaged (as shown by networkctl), so wait-online should not wait, and
simply report that all interfaces are unmanaged, possibly returning an error so
we don't reach network-online.
FWIW, having wait-online look up configuration might later be useful
also to figure out if an interface was configured, but marked as
optional (such that it is explicitly not required to be up at boot), or
if we want to configure network devices but specify that networkd should
*not* bring them online (like "administratively disabled" interfaces in
Cisco world using the "shutdown" command).
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1728181
Title:
systemd-networkd-wait-online waits when devices are unmanaged
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