[Bug 2081124] Re: systemd service dependency loop between cloud-init, NetworkManager and dbus

[Chad Smith]

The differences we are seeing between a working Desktop ubuntu image
with /var/log/installer/media-info 202408271 are that cloud-init
published 24.2 via SRU to the newer Noble image


In that SRU was a shift to when cloud-init-hotplugd.socket and cloud-
init-hotplugd.service units are ordered[1]

The change added:
- After=cloud-config.target to cloud-init-hotplugd.socket  to allow starting hotplugd.socket earlier
and
- After=cloud-init.target to cloud-init-hotplugd.service  to avoid attempting udev NIC hotplug events while cloud-init is still configuring the base instance.


We'll need further investigation tomorrow to determine the ordering cycles we are seeingin Desktop images w/ NetworkManager-wait-online.service here, and why on first boot the systemd unit being deleted is dbus.service yet in ephemeral environment (before first boot) it happens to be cloud-init-hotplugd.service.


[1] https://github.com/canonical/cloud-init/pull/5058

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https://bugs.launchpad.net/bugs/2081124

Title:
  systemd service dependency loop between cloud-init, NetworkManager and
  dbus

Status in OEM Priority Project:
  New
Status in cloud-init package in Ubuntu:
  New
Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  We got errors that some services like snapd and NetworkManager is not
  started when running cloud-init or desktop, excerpt from journal
  below:

  Sep 13 12:37:41 localhost.localdomain systemd[1]: cloud-init.service: Found ordering cycle on NetworkManager-wait-online.service/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: cloud-init.service: Found dependency on basic.target/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: cloud-init.service: Found dependency on sockets.target/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: cloud-init.service: Found dependency on cloud-init-hotplugd.socket/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: cloud-init.service: Found dependency on cloud-config.target/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: cloud-init.service: Found dependency on cloud-init.service/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: cloud-init.service: Job NetworkManager-wait-online.service/start deleted to break ordering cycle starting with cloud-init.service/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: NetworkManager.service: Found ordering cycle on dbus.service/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: NetworkManager.service: Found dependency on basic.target/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: NetworkManager.service: Found dependency on sockets.target/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: NetworkManager.service: Found dependency on cloud-init-hotplugd.socket/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: NetworkManager.service: Found dependency on cloud-config.target/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: NetworkManager.service: Found dependency on cloud-init.service/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: NetworkManager.service: Found dependency on NetworkManager.service/start
  Sep 13 12:37:41 localhost.localdomain systemd[1]: NetworkManager.service: Job dbus.service/start deleted to break ordering cycle starting with NetworkManager.service/start

  Related logs and service files are attached in sosreport.

  Internal reference: NANTOU-473

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