Hi Ryan, [Journal Output] Attached.
[Reproducer] uvt-kvm create xenial-test release=xenial arch=amd64 virsh edit xenial-test # change network interface pci slot: s/0x03/0x10/ virsh destroy xenial-test virsh start xenial-test uvt-kvm ssh xenial-test dmesg|grep rename [ 2.790623] virtio_net virtio3 ens16: renamed from eth0 [ 6.048520] virtio_net virtio3 ens3: renamed from ens16 [Analysis] I've been working on this a lot, and I think I have the cause of the difference. In udev-events.c, udev_execute_rules will _forcibly_ rename a device with via a netlink message if there is a matching rule that sets a name. Under Xenial, there *is* a matching rule, in 70-persistent-net.rules, so this forces a rename. This rename will occur even if the device already has a name, and therefore even if the rules file isn't in the initramfs. Under Bionic, this rules file doesn't exist, there is a .link file instead. Unfortunately, a name in a .link file will only take effect if the device hasn't been renamed - because of the renaming in initrd, this means that a link file that is not present in the initrd will never be able to cause a rename. [Solutions] There are a couple of ways we could fix this that come to mind: - make netplan generate a file in /run/udev/rules.d for each device - make systemd rename devices from a link file even if they've been renamed My preference is the first, but I'm open to anything we can get upstream. Thanks again. Regards, Daniel ** Attachment added: "journalctl -b output on Xenial VM with multiple renames" https://bugs.launchpad.net/netplan/+bug/1770082/+attachment/5139894/+files/journalctl-b.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1770082 Title: systemd-networkd not renaming devices on boot To manage notifications about this bug go to: https://bugs.launchpad.net/netplan/+bug/1770082/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
