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

[Dimitri John Ledkov]

networkd does not have a toggle to tear down the bond first =/ or to
force changing the parameters of it. Maybe a toggle like that should be
added to really-really reload all the settings.

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

Status in nplan package in Ubuntu:
  Confirmed
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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