[Bug 2003250] [NEW] networkctl reload with bond devices causes slaves to go DOWN and UP, causing couple of seconds of network loss

[frantisek reznicek]

Public bug reported:

We currently use Ubuntu 22.04.1 LTS including updates for our production cloud (switched from legacy Centos 7).
Although we like the distribution we recently hit serious systemd buggy behavior described in [1] bugreport using packages [2].

Unfortunatelly the clouds we are running consist of openstack on top of
kubernetes and we need to have complex network configuration including
linux bond devices.

Our observation is that every time we apply our configuration via CI/CD
infrastructure using ansible and netplan (regardless whether there is
actual network configuration change) we see approximatelly 8-16 seconds
network interruptions and see bond interfaces going DOWN and then UP.

We expect bond interfaces stay UP when there is no network configuration
change.

We went though couple of options how to solve the issue and the first
one is to add such existing patch [3] into current
systemd-249.11-0ubuntu3.6.

Could you comment whether this kind of non-security patch is likely to land in 22.04.1 LTS soon.
We are able to help to bring patch into systemd package community way if you suggest the steps.


[1] https://github.com/systemd/systemd/issues/25067
[2] Packages
root at controlplane-001:/etc/apt0# apt list | grep -E '^(systemd/|netplan.io)'
netplan.io/jammy-updates,now 0.105-0ubuntu2~22.04.1 amd64 [installed,automatic]
systemd/jammy-updates,now 249.11-0ubuntu3.6 amd64 [installed,automatic]
[3] https://github.com/systemd/systemd/pull/25162
[4] # lsb_release -rd
Description:    Ubuntu 22.04.1 LTS
Release:        22.04

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: networking

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https://bugs.launchpad.net/bugs/2003250

Title:
  networkctl reload with bond devices causes slaves to go DOWN and UP,
  causing couple of seconds of network loss

Status in systemd package in Ubuntu:
  New

Bug description:
  We currently use Ubuntu 22.04.1 LTS including updates for our production cloud (switched from legacy Centos 7).
  Although we like the distribution we recently hit serious systemd buggy behavior described in [1] bugreport using packages [2].

  Unfortunatelly the clouds we are running consist of openstack on top
  of kubernetes and we need to have complex network configuration
  including linux bond devices.

  Our observation is that every time we apply our configuration via
  CI/CD infrastructure using ansible and netplan (regardless whether
  there is actual network configuration change) we see approximatelly
  8-16 seconds network interruptions and see bond interfaces going DOWN
  and then UP.

  We expect bond interfaces stay UP when there is no network
  configuration change.

  We went though couple of options how to solve the issue and the first
  one is to add such existing patch [3] into current
  systemd-249.11-0ubuntu3.6.

  Could you comment whether this kind of non-security patch is likely to land in 22.04.1 LTS soon.
  We are able to help to bring patch into systemd package community way if you suggest the steps.

  
  [1] https://github.com/systemd/systemd/issues/25067
  [2] Packages
  root at controlplane-001:/etc/apt0# apt list | grep -E '^(systemd/|netplan.io)'
  netplan.io/jammy-updates,now 0.105-0ubuntu2~22.04.1 amd64 [installed,automatic]
  systemd/jammy-updates,now 249.11-0ubuntu3.6 amd64 [installed,automatic]
  [3] https://github.com/systemd/systemd/pull/25162
  [4] # lsb_release -rd
  Description:    Ubuntu 22.04.1 LTS
  Release:        22.04

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