> The requirement here is, I need to know when ens1 goes up or down, so
> that I can make changes to the bridge interface. The `ifmonitor` script
> will monitor the link status of ens1, and then take appropriate actions,
> such as restarting a DHCP client, adding or removing routes that have
> been programmed via the lan0 bridge to egress on ens1, adding or
> removing IP addresses from the configuration, etc.
Knowing the status of the physical link so that you can take appropriate
action on the bridge/bond makes sense. But it seems to me that should
be handled intrinsically by networkd, not something you could or should
configure with scripts. Opening a task on systemd for us to verify the
behavior here. When all the physical links in a bridge/bond drop, does
networkd treat that as a down / subsequent up event?
When you say "egress on ens1", what do you mean? Your network config
doesn't show any such routes. Why would these routes be managed
externally to networkd?
> In the ifupdown world, the other horrible hack I've sometimes found
> necessary (although the reason why is eluding me at the moment) is when
> I want an interface to be 'manual', yet behave like a 'static'
> definition, in that it should configure itself automatically when it
> comes online. So I might have something like:
In ifupdown, I would expect to handle this as a static network without
'auto'.
For netplan / networkd, this looks like it needs some further work to
support, already captured in bug #1664844.
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Changed in: systemd (Ubuntu)
Importance: Undecided => High
** Changed in: systemd (Ubuntu)
Status: New => Triaged
** Changed in: systemd (Ubuntu)
Milestone: None => ubuntu-17.05
** Changed in: systemd (Ubuntu)
Assignee: (unassigned) => Mathieu Trudel-Lapierre (cyphermox)
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https://bugs.launchpad.net/bugs/1664818
Title:
Not possible to render pre-up, pre-down, post-up, or post-down
snippets
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