[Bug 1746419] Re: bond parameters are not changed by 'netplan apply'

[Lukas Märdian]

This is still an issue. I like the idea of deleting the bond (e.g.
"networkctl delete bond0" during the "netplan apply" call. But as stated
before by daxtens, we need to make sure not to bring down critical
interfaces, that might be in use.

We could either only apply this only to interfaces, that are not marked
as "critical: true" in netplan or hide it behind a "--force" parameter
to "netplan apply". We should also investigate if there might be other
options in more recent versions of systemd-networkd to make it apply new
bond parameters without bringing down the interface.

Closing the "nplan" component, as that package is no more in any recent
series of Ubuntu.

** Changed in: netplan
       Status: Confirmed => Triaged

** Changed in: netplan
   Importance: Undecided => Medium

** Changed in: nplan (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1746419

Title:
  bond parameters are not changed by 'netplan apply'

Status in netplan:
  Triaged
Status in nplan package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Won't Fix

Bug description:
  I have a yaml file as follows:

  network:
      version: 2
      ethernets:
          bonddevs:
              match:
                  name: ens[78]
      bonds:
          bond0:
              interfaces: [bonddevs]
              parameters:
                  mode: active-backup
                  mii-monitor-interval: 1
              addresses:
                  - 10.10.10.1/24

  
  Say I decide that 1s is too frequent for the MII interval, and I want to change the interval to 2s.

  If I change that in the yaml, then run
  # netplan generate
  # netplan apply
  # cat /proc/net/bonding/bond0|grep "MII Polling Interval (ms)"
  MII Polling Interval (ms): 1000

  In other words, the change has not been applied.

  Running netplan --debug apply prints:
  DEBUG:device bond0 operstate is up, not replugging

  So I wondered if bringing the bond down would help. It does not:
  # ip link set dev bond0 down
  # netplan apply
  # cat /proc/net/bonding/bond0|grep "MII Polling Interval (ms)"
  MII Polling Interval (ms): 1000

  However, deleting the link works:
  # ip link del dev bond0
  # netplan apply
  # cat /proc/net/bonding/bond0|grep "MII Polling Interval (ms)"
  MII Polling Interval (ms): 2000

  This is counter-intuitive behaviour.
  Ideally, I would like a regular netplan apply to work without deleting the bond.
  However, a changed to the docs to make this clear would be OK.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: nplan 0.32~17.10.1
  ProcVersionSignature: User Name 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  Date: Wed Jan 31 05:47:42 2018
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: nplan
  UpgradeStatus: No upgrade log present (probably fresh install)

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