Public bug reported: Ubuntu 18.04 Bionic Beaver
An issue was reported to systemd-networkd on GitHub - https://github.com/systemd/systemd/issues/11650 - and all the thorough details are there. Using anonymous bridges (ie: not attached to physical NICs) is problematic with systemd-networkd as they get deconfigured as soon as the last attached device disconnects (ie: a LXC container). Static IP configuration must be done again manually. The root cause is that systemd-networkd assumes that every network interface have a carrier signal. There's no notion of carrier signal on anonymous bridges, a case not properly handled by systemd-networkd. The systemd dev team provided a patch to address the issue and it would be nice to be integrated on the Ubuntu package. The PR is here : https://github.com/systemd/systemd/commit/93b4dab57e2e13bd804cbee999241be65a443e2e To get the proper fix, you'll need to combine 2 patches : - The one from the PR above - Another patch [1] which fixes a segfault introduced by the PR. [1] https://github.com/systemd/systemd/pull/11741/commits/a294af6810df3c18909a96b556deadba0e2ab0a9 On my test environment, I rebuild the Ubuntu package with the 2 patches above from "237-3ubuntu10.17" to "237-3ubuntu10.20" and made thorough tests without hiting a single issue so I think we can assume that these 2 patches are safe to use. ** Affects: systemd (Ubuntu) Importance: Undecided Status: 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/1825470 Title: systemd-networkd: Deconfigures bridge after last attached interface disconnects (ie: LXC) Status in systemd package in Ubuntu: New Bug description: Ubuntu 18.04 Bionic Beaver An issue was reported to systemd-networkd on GitHub - https://github.com/systemd/systemd/issues/11650 - and all the thorough details are there. Using anonymous bridges (ie: not attached to physical NICs) is problematic with systemd-networkd as they get deconfigured as soon as the last attached device disconnects (ie: a LXC container). Static IP configuration must be done again manually. The root cause is that systemd-networkd assumes that every network interface have a carrier signal. There's no notion of carrier signal on anonymous bridges, a case not properly handled by systemd-networkd. The systemd dev team provided a patch to address the issue and it would be nice to be integrated on the Ubuntu package. The PR is here : https://github.com/systemd/systemd/commit/93b4dab57e2e13bd804cbee999241be65a443e2e To get the proper fix, you'll need to combine 2 patches : - The one from the PR above - Another patch [1] which fixes a segfault introduced by the PR. [1] https://github.com/systemd/systemd/pull/11741/commits/a294af6810df3c18909a96b556deadba0e2ab0a9 On my test environment, I rebuild the Ubuntu package with the 2 patches above from "237-3ubuntu10.17" to "237-3ubuntu10.20" and made thorough tests without hiting a single issue so I think we can assume that these 2 patches are safe to use. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1825470/+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
