emit net-device-down signal when network-manager deconfigures interface

[muzzol]

I want to execute a script when network (any interface) goes up and when goes down (with parameters).

I've found easy to trigger first part with

    start on (net-device-up IFACE!=lo)

but didn't manage to found an easy way to trigger either net-device-down, net-device-remove(d) , deconfiguring-networking

my job loks like this:

##################################################################
description "network test"

start on (net-device-up IFACE!=lo)
# stop on ((net-device-down IFACE!=lo) or deconfiguring-networking)
stop on net-device-removed IFACE!=lo

pre-start exec /opt/test.sh start "$UPSTART_JOB - EVENT: $UPSTART_EVENTS"

post-stop exec /opt/test.sh stop "$UPSTART_JOB - EVENT: $UPSTART_STOP_EVENTS"

##################################################################

to test it I just go to nm-applet and deactivate one interface.

I've finally managed to make it work creating a simple script in '/etc/network/if-post-down.d' to force emmiting the signal. something like this:

########################################
#!/bin/sh

[ "$IFACE" != "lo" ] || exit 0

initctl emit -n net-device-removed IFACE=$IFACE

########################################

I'm not sure if this is expecte behaviour, if this is a feature request or if it's a real bug, but for company pourposes I really need to emit a signal when any interface (not lo) goes down.

please, ask for further info

EDITED: I can see here

https://lists.ubuntu.com/archives/upstart-devel/2011-January/001379.html

that '/etc/network/if-down.d/upstart' should emit net-device-down but in my case that's not true. so maybe the bug should be:

event not emited by '/etc/network/if-down.d/upstart'

[Clint Byrum (clint-fewbar)]

Excerpts from muzzol's message of Sat May 12 14:38:54 UTC 2012:
> ** Description changed:
>
> I want to execute a script when network (any interface) goes up and when
> goes down (with parameters).
>
> I've found easy to trigger first part with
>
> - start on (net-device-up IFACE!=lo)
> +     start on (net-device-up IFACE!=lo)
>
> but didn't manage to found an easy way to trigger either net-device-
> down, net-device-remove(d) , deconfiguring-networking
> -
>
> my job loks like this:
>
> ##################################################################
> description "network test"
>
> start on (net-device-up IFACE!=lo)
> # stop on ((net-device-down IFACE!=lo) or deconfiguring-networking)
> stop on net-device-removed IFACE!=lo
>
> pre-start exec /opt/test.sh start "$UPSTART_JOB - EVENT:
> $UPSTART_EVENTS"
>
> post-stop exec /opt/test.sh stop "$UPSTART_JOB - EVENT:
> $UPSTART_STOP_EVENTS"
>

net-device-down should be emitted whenever an interface goes down:

$ cat !$
cat /etc/network/if-down.d/upstart
#!/bin/sh

set -e

initctl emit -n net-device-down \
    "IFACE=$IFACE" \
    "LOGICAL=$LOGICAL" \
    "ADDRFAM=$ADDRFAM" \
    "METHOD=$METHOD"

[muzzol (muzzol)]

in my case it doesn't.

I tried with a fresh install of 12.04 and some other machines.

can't you reproduce it?

[muzzol (muzzol)]

I can confirm that '/etc/network/if-down.d/upstart' is NOT executed when any interface is down.

I've added a simple test line to test it:

       echo "`date` - $0 - $IFACE - $METHOD" >> "/tmp/upstart.log"

and no file is created.

I've also found a workaround, if I create a link in '/etc/network/if-post-down.d/' it works. so for now, if anyone is interested, you can execute

     ln -s /etc/network/if-down.d/upstart /etc/network/if-post-down.d/upstart

and you'll get desired behaviour.

I'm still waiting for some dev to confirm this bug

[Steve Langasek (vorlon)]

The script does work; this seems to be a problem with NetworkManager not invoking the if-down .d scripts as expected.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Michael Jonker (citizen-jonker)]

Can confirm that workaround in #3 works for me as well

[user (meta1729-deactivatedaccount)]

Present in 14.04 as well.
Following workaround works.
$ ln -s /etc/network/if-down.d/upstart /etc/network/if-post-down.d/upstart

Suggestion to upstart developers: Why not move the upstart script from if-down.d/ to if-post-down.d/ dir?

[Istvan (bergkatten)]

2015 the bug is still there in Ubuntu 14.04.3.

[Robert Rößler (r-roessler)]

Still there in Ubuntu Ubuntu 14.04.5 LTS. With workaround signal pops up in upstart-monitor.