dhcp-all-interfaces leaves eth0 in place even when it has no link

[Robert Collins]

This is more on the building side - if we're going to autodetect, having /e/n/i with eth0 listed is a bit redundant (and slows down boot).

[Dan Prince (dan-prince)]

FWIW This only affects distributions which use the ENI files (/etc/network/interfaces). When I implemented this on Fedora with netscripts I specifically removed the eth0 (or whatever) device if it wasn't present via a new disable_interface function that I added. This function is currently a noop if you aren't using netscripts however.

Is truncating /etc/network/interfaces an option? If so... then I think this could be an easy fix.

[Ghe Rivero (ghe.rivero)]

Another quick fix could be to put our own ine file in place with only the loopback interface active.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/128213

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/128213
Committed: https://git.openstack.org/cgit/openstack/diskimage-builder/commit/?id=0b861942166b1c89569c3846dd38d2200b69f176
Submitter: Jenkins
Branch: master

commit 0b861942166b1c89569c3846dd38d2200b69f176
Author: Ghe Rivero <email address hidden>
Date: Thu Oct 9 12:33:01 2014 +0000

    Disable all interfaces on eni systems

    We are autodetecting and configuring devices in dhcp-all-interfaces
    so having one configured in /etc/network/interfaces by default
    is redundant and slows boot down.

    Change-Id: Ic4e8a0668c793d21ed2dd96908649c9a77264f67
    Closes-Bug: #1239480