[systemd-devel] How to set primary slave in active-backup mode (bonding)

Mikhail Morfikov mmorfikov at gmail.com
Thu May 21 01:51:36 PDT 2015

On Tue, 19 May 2015 18:12:15 +0200
Tom Gundersen <teg at jklm.no> wrote:

> On Thu, Apr 9, 2015 at 4:29 PM, Mikhail Morfikov
> <mmorfikov at gmail.com> wrote:
> > I usually have two network interfaces on my laptops (one eth and one
> > wlan), and when I was using sysvinit I also was configuring the bond
> > interface via the /etc/network/interfaces file so the two interfaces
> > could work in the active-backup mode. But now, they work in
> > balance-rr mode which is set via the .netdev file. The problem with
> > this mode is that when you have, let's say wifi 30mbit/s and wired
> > 100mbit/s, you can get 60mbit/s max, and that's why I wanted to use
> > the active-backup mode which switches from wire to wifi and vice
> > versa depending on whether the ethernet cable is plugged in.
> > Generally speaking, I have to set some additional parameters so
> > this could work well, and that would be:
> We don't yet fully support all the bonding options.
> > bond-primary eth1
> This is not currently supported, I suppose we should add the
> possibility of marking a slave as 'primary' to the .network file
> (rather than listing the slave in the .netdev file).
> > bond-primary-reselect always
> This is PrimaryReselectPolicy=always in the .netdev file.
> > bond-slaves eth1 wlan0
> This is achieved by setting Bond= in the .network files applied to
> eth1 and wlan0.
> > bond-fail-over-mac none
> This is FailOverMACPolicy=none in the .netdev file, which is also the
> default, so is redundant.
> > I'm not sure if all of them are necessary, and the question is how
> > to pass these parameters in systemd? I'm asking because in the
> > systemd.netdev manual, in the bond section, these options weren't
> > specified.
> I hope the above helps, but I suspect you really need the feature to
> specify the primary slave for this to work as you intended. Happy to
> take a patch!
> Cheers,
> Tom

Thank you for the information.

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