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Asked: 2020-03-12 08:22:10 +0800 CST

Change network bonding parameters without reboot

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In Ubuntu 18.04 I have the netplan bonding configuration like this:

  bonds:
    bond0:
      interfaces:
        - eno1
        - eno2
      parameters:
        mode: active-backup
        primary: eno1

I discovered that this does not actually cause the network to fail over to eno2 if the cable is unplugged from eno1 unless I set mii-monitor-interval, like this:

  bonds:
    bond0:
      interfaces:
        - eno1
        - eno2
      parameters:
        mode: active-backup
        mii-monitor-interval: 100

(Setting primary seems to be unnecessary - is it?)

However, this change does not seem to take effect after netplan apply - cat /proc/net/bonding/bond0 does not show the new MII Polling Interval value until I reboot.

Is there a way to apply this change without rebooting?

https://unix.stackexchange.com/questions/148838/reset-ethernet-bonding-without-rebooting suggests service network restart but there is no "network" service in Ubuntu 18.04.

networking network-bonding

1 Answers

  1. I found a Launch bug about this, which mentions the workaround: https://bugs.launchpad.net/ubuntu/+source/nplan/+bug/1746419

    Running the following as root does the trick, though this still briefly disconnects the machine from the network

    ip link del dev bond0 && netplan apply

    (I would advise against running the above if you only have network access to the machine!)

    • 3