Commit 223932c786ada7f758a7b7878a6ad2dae0d1e5fb [networkd: fix dhcp4
link without routes not being considered ready (#8728)]. Only systemd
release v239 contains this fix.
** No longer affects: systemd
** Also affects: systemd
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1804478
Title:
netplan dhcp interface with no default route causes systemd-networkd-
wait-online to hang
Status in systemd:
New
Status in systemd package in Ubuntu:
Confirmed
Bug description:
root cause in systemd bug:
https://github.com/systemd/systemd/issues/3752
Environment:
Ubuntu 18.04 LTS amd64
systemd package version 237-3ubuntu10.9
How to trigger:
1. add netplan interface with dhcpv4 client enabled:
enp0s8:
addresses: []
dhcp4: true
2. configure dhcp server to NOT give a default route, or any route for that
matter
3. reboot
4. systemd-networkd-wait-online will block until dhcp renew is triggered
root@sensor1:~# /lib/systemd/systemd-networkd-wait-online --timeout=3
Event loop failed: Connection timed out
root@sensor1:~# /lib/systemd/systemd-networkd-wait-online --timeout=3
--ignore=enp0s8
managing: enp0s3
ignoring: lo
ignoring: enp0s8
How to fix:
Backport upstream changes from systemd (see related systemd ticket).
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