Public bug reported:
If a system only has DNS server info via open-iscsi (putting aside
whether or not that's a good idea), and then starts a Docker container
or LXD container, name resolution breaks.
The open-iscsi udev rules invokes net-interface-handler when a network
device is added or removed. This helper deals with dns resolution. On
boot, this sets up dns resolution based on the information gathered
during early boot.
However:
1) The udev rule and script run the full script for all network
interfaces, whether or not they are the iscsi interface - they do not
bail out early if there is a mismatch. So, the removal of any device
triggers 'net-interface-handler stop', which removes the
/run/resolvconf/interface/ethX.iscsi-target file, breaking resolution.
This occurs even if the interface being removed is *not* ethX.
2) For some reason, both starting a docker container and starting an LXD
container involve adding 2 interfaces and then removing one. The
additions do nothing, as the resolution rule has already been installed.
The removal, however, causes the resolution rule to be removed, breaking
DNS.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: open-iscsi 2.0.873+git0.3b4b4500-14ubuntu3.4
ProcVersionSignature: Ubuntu 4.4.0-98.121-generic 4.4.90
Uname: Linux 4.4.0-98-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Wed Nov 15 05:19:12 2017
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: open-iscsi
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.iscsi.iscsid.conf: 2017-10-20T20:38:27.028134
** Affects: open-iscsi (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: apport-bug uec-images
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https://bugs.launchpad.net/bugs/1732342
Title:
DNS info removed when any interface removed, not just iSCSI interface
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