Ubuntu
systemd package

  1. Bug #1804478
  2. Comment #0

Comment 0 for bug 1804478

Revision history for this message
Mikko Korkalo (mkorkalo) wrote : netplan dhcp interface with no default route causes causes systemd-networkd-wait-online to hang

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).