[Bug 2098093] Re: Setting primary interface for a bond fails with netplan

[Lukas Märdian]

** Also affects: netplan
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2098093

Title:
  Setting primary interface for a bond fails with netplan

Status in Netplan:
  New
Status in netplan.io package in Ubuntu:
  Triaged
Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 2404

  network-manager 1.46.0-1ubuntu2.2

  netplan.io      1.1.1-1~ubuntu24.04.1

  When [improving support for primary interfaces of
  bonds](https://github.com/cockpit-project/cockpit/pull/21533) in
  Cockpit, we encountered this message in the journal:

  ```
  Feb 10 08:43:17 ubuntu NetworkManager[9361]: /etc/netplan/90-NM-861a710b-9858-48f4-b5e5-a770ab67bd1f.yaml:13:18: Error in network definition: tbond: interface 'cockpit' is not defined
  Feb 10 08:43:17 ubuntu NetworkManager[9361]:         primary: "cockpit"
  Feb 10 08:43:17 ubuntu NetworkManager[9361]:                  ^
  ```

  The message seems to come from "netplan apply":

  ```
  # netplan apply
  [...]
  /etc/netplan/90-NM-4883fb46-4315-41f1-b945-bb096768da61.yaml:13:18: Error in network definition: tbond: interface 'cockpit' is not defined
          primary: "cockpit"
                   ^
  # echo $?
  78
  ```

  NetworkManager seems to ignore the failure, and somehow the bond
  interface is created anyway, but the "bond.options" setting of its
  connection doesn't include the expected "primary" attribute:

  ```
  # nmcli con show tbond | grep ^bond
  bond.options:                           mode=active-backup,downdelay=0,miimon=100,updelay=0
  ```

  I have no idea what the relationship between netplan and
  NetworkManager is. I am guessing that NetworkManager is writing the
  yaml files in /etc/netplan/.

  The problem seems to be that the definition of the "cockpit" interface
  uses a generated name:

  ```
  network:
    version: 2
    ethernets:
      NM-3287d9ea-ffda-49df-9f21-27594d7cc1b8:
        renderer: NetworkManager
        match:
          name: "cockpit"
        wakeonlan: true
        networkmanager:
          uuid: "3287d9ea-ffda-49df-9f21-27594d7cc1b8"
          name: "cockpit"
          passthrough:
            connection.controller: "tbond"
            connection.master: "tbond"
            connection.port-type: "bond"
            connection.slave-type: "bond"
            ethernet._: ""
  ```

  If I change this to

  ```
  network:
    version: 2
    ethernets:
      cockpit:
        renderer: NetworkManager
        match:
          name: "cockpit"
  [...]
  ```

  then the error disappears and `bond.options` shows the expected value:

  ```
  # nmcli con show tbond | grep ^bond
  bond.options:                           mode=active-backup,downdelay=0,miimon=100,primary=cockpit,updelay=0
  ```

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