** Description changed:
+ [Impact]
+
+ * Upgrading s390x, kvm/qemu instances from yakkety to zesty results in a
change of network interface names (e.g. from eth0 to stable/predictable bus_id
name enc3, just like on z/VM and LPAR).
+ * This obviously results in loss of network connectivity as
/etc/network/interfaces no longer matches the network interface names
configured by systemd.
+ * The proposal is to generate udev rules on upgrade to preserve active
interface names, in a very similar fashion to the no longer in use
net-persistent-name generator.
+
+ [Test Case]
+
+ * Install zesty from scratch in kvm/qemu, network interfaces should use enc*
names.
+ * Install yakkety, upgrade to zesty, network intefaces should use eth* names
after upgrade and reboot.
+
+ [Regression Potential]
+
+ * This solution is similar to previous upgrades to stable networking
+ names for other types of network interfaces. This will make upgraded
+ systems look different from freshly installed systems. For users aiming
+ to have homogenious environments it is recommended to remove
+ /etc/udev/rules.d/70-persistent-net.rules and readjust
+ networking/daemon/firewall configurations to the new stable names enc*.
+
+ [Other Info]
+
+ * Original bug report filed in debian.
+
Package: udev
Version: 232-20
Severity: important
Dear Maintainer,
systemd 232-20 introduce the patch to generate stable interface names
for virtio network interfaces on s390x. This is a good thing, and
those names should be used for new installations.
However, when upgrading existing virtual machines installations the
new udev causes interfaces to be renamed from eth0 -> enc1 thus
breaking networking configuration and possibly other configs
(e.g. daemons, firewalls etc).
Therefore on upgrade (but not clean installs) something like
persistent net rules should be generated to preserve ethX interface
names and thus not break networking configuration.
I will attach a proposed patch to achieve this shortly for review.
It is important to fix this in stretch such that upgrades to stretch
are flawless.
** Also affects: systemd (Ubuntu Zesty)
Importance: High
Assignee: Dimitri John Ledkov (xnox)
Status: Triaged
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https://bugs.launchpad.net/bugs/1682437
Title:
udev does not preserve virtio interface names on s390x upgrades
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