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This breaks a couple of services that depend on > having the id. An example is the systemd-networkd with DHCP, leading > to error messages like this one (and breaking networking): >=20 > systemd-networkd[277]: enp8s0: DHCP6 CLIENT: Failed to set > identifier: No such file or directory Seems that can also cause issues for NetworkManager where one can loose the network when a lease expires and a renew is due. I hope that https://github.com/ilbers/isar/commit/693d76b8c06af fixed that but just drop the error message here for completeness. NetworkManager[526]: [1665061214.9410] /etc/machine-id: no valid machine-id. Use fake one based on secret-key: ... Henning > The error can manually be fixed by running > "systemd-machine-id-setup", but this obviously does not work in > embedded scenarios. >=20 > The root cause could be that /etc is read-only mounted when the > first-boot-complete.target is reached. At least the logs indicate > this: >=20 > journalctl --grep machine --no-pager > -- Journal begins at Thu 2022-07-21 15:07:21 UTC, ends at Thu > 2022-07-21 15:35:20 UTC. -- Jul 21 15:07:21 test-image systemd[1]: > System cannot boot: Missing /etc/machine-id and /etc is mounted > read-only. Jul 21 15:07:21 test-image systemd[1]: 1) /etc/machine-id > exists and is populated. Jul 21 15:07:21 test-image systemd[1]: 2) > /etc/machine-id exists and is empty. Jul 21 15:07:21 test-image > systemd[1]: 3) /etc/machine-id is missing and /etc is writable. Jul > 21 15:07:24 test-image systemd[1]: Condition check resulted in Commit > a transient machine-id on disk being skipped. >=20 > Maybe Quirin knows more, as he implemented the postproc removal in > 8b5e3f9. IIRC Jan also mentioned something that "rw" has to be added > to the kernel cmdline, but this looks like a workaround as well. For > the sake of completeness: >=20 > cat /proc/cmdline > initrd=3D\initrd.img-5.10.0-16-amd64 LABEL=3DBoot > root=3DPARTUUID=3D9ad286e9-8df8-42c2-ac7d-0f2d7387d03d rootwait > console=3Dtty0 console=3DttyS0,115200 >=20 > IMO this is a pretty critical bug as it affects a ton of images. >=20 > Best regards, > Felix >=20 > -- > Siemens AG, Linux Expert Center > Otto-Hahn-Ring 6, 81739 M=C3=BCnchen, Germany >=20