ifup@.service works as intended. The idea is that /etc/init.d/networking brings up all "auto" interfaces, and that unit takes care of the hotplugged interfaces only.
The problem is that /etc/init.d/networking (or something it calls) doesn't work if / is read-only. I'll investigate what it's trying to do. ** Summary changed: - ifup should specify '-allow=auto' not '-allow=hotplug' + auto interfaces do not come up with r/o images ** Package changed: systemd (Ubuntu) => ifupdown (Ubuntu) ** Changed in: ifupdown (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1374521 Title: auto interfaces do not come up with r/o images Status in “ifupdown” package in Ubuntu: New Bug description: /lib/systemd/system/ifup@.service specifies: ExecStart=/sbin/ifup --allow=hotplug %I This really needs to be: ExecStart=/sbin/ifup --allow=auto %I Since otherwise, for systems that don't use network-manager, the service will only bring up interfaces which have specified "allow- hotplug $if" in /etc/network/interfaces*. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: systemd 208-8ubuntu4 ProcVersionSignature: Ubuntu 3.16.0-17.23-generic 3.16.3 Uname: Linux 3.16.0-17-generic x86_64 ApportVersion: 2.14.7-0ubuntu2 Architecture: amd64 CurrentDesktop: Unity Date: Fri Sep 26 16:54:12 2014 InstallationDate: Installed on 2014-04-11 (167 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140409) SourcePackage: systemd UpgradeStatus: Upgraded to utopic on 2014-05-08 (141 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1374521/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp