** Changed in: systemd (Ubuntu Disco)
Status: New => Incomplete
** Changed in: systemd (Ubuntu Bionic)
Status: New => Incomplete
** Changed in: systemd (Ubuntu Cosmic)
Status: New => Incomplete
** Changed in: systemd (Ubuntu Eoan)
Importance: Medium => Undecided
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https://bugs.launchpad.net/bugs/1825470
Title:
systemd-networkd: Deconfigures bridge after last attached interface
disconnects (ie: LXC)
Status in systemd package in Ubuntu:
Incomplete
Status in systemd source package in Bionic:
Incomplete
Status in systemd source package in Cosmic:
Incomplete
Status in systemd source package in Disco:
Incomplete
Status in systemd source package in Eoan:
Incomplete
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.
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